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Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for Design of Building Foundations
GBJ7—89
1989 Beijing
Engineering Construction Standard Full-text Information System
W Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for Design of Building Foundations
GBJ7—89
Editor Department: Former Ministry of Urban and Rural Construction and Environmental Protection of the People's Republic of China Approval Department: China
Effective Date: 1
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full Text Information System
Notice on the Release of the National Standard "Design Code for Building Foundations"
(89) Jianbiaozi No. 144
According to the requirements of the former State Construction Commission (81) Jianfashezi No. 546, the former Ministry of Urban and Rural Construction and Environmental Protection, together with relevant departments, revised the "Design Code for Industrial and Civil Building Foundations" TJ7-74 and renamed it "Design Code for Building Foundations". After review by relevant departments, the "Design Code for Building Foundations" GBJ7-89 is now approved as a national standard and will be implemented on January 1, 1990. "Design Code for Industrial and Civil Building Foundations" TJ7-74 was abolished on June 30, 1991.
This code is managed by the Ministry of Construction, interpreted by the China Academy of Building Research, and published and distributed by China Architecture & Building Press. Ministry of Construction of the People's Republic of China
March 27, 1989
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Revision Notes
This specification is based on the spirit of the Notice No. 546 of the former State Construction Commission (81) Jianfashe, and is revised by the China Academy of Building Research of our Ministry in conjunction with relevant scientific research, design, survey units and colleges and universities to the original "Industrial and Civil Building Foundation Design Code" TJ7-74. During the revision process, the specification revision group conducted special research, investigated and summarized the domestic scientific research results and engineering practice experience in recent years, proposed a revised draft, and widely solicited opinions from relevant units across the country in various ways. After repeated revisions, it was finally reviewed and finalized by our Ministry in conjunction with relevant departments. This code consists of eight chapters and sixteen appendices, which greatly supplement and revise the original code. The main contents are as follows:
, According to the requirements of the national standard "Unified Standard for Building Structure Design" GBJ68-84, the design principles and calculation methods are stipulated. According to the provisions of the national standard "General Symbols, Units of Measurement and Basic Terms for Building Structure Design" GBJ83-85, the symbols, units of measurement and basic terms are revised. 2. The classification and description of soil are partially revised, the lower limit of sand is stipulated, the category of silt is added, and the definition of red clay is revised. 3. The method of determining the bearing capacity of rock foundation by the uniaxial compressive strength of rock is added. The bearing capacity table of old clay and newly deposited clay soil is cancelled, the bearing capacity table of silt soil is added, the bearing capacity table of red clay is revised, and the engineering characteristic index of soil is determined by mathematical statistics method. 4. The standard frozen depth line map of seasonal frozen soil in China is revised, and the anti-freezing damage measures for foundations of different frost heave types are supplemented.
5. Verify the weak underlying layer and determine the pressure diffusion angle by taking the ratio of the compression modulus of the upper and lower soil layers.
6. Supplement the allowable value of foundation deformation of buildings, revise the method for determining the depth of settlement calculation, and adjust the empirical coefficient of settlement calculation. 7. Revise the calculation method of active earth pressure of retaining walls. Engineering Construction Standard Full Text Information System
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8. Supplement the design calculation of high cup foundation, and add the content of strip foundation under column and Xiao foundation under wall.
9. Supplement the expanded bottom pile, add the bearing capacity calculation when the pile foundation is embedded in rock, and revise the bending resistance calculation of pile foundation cap.
This code must be used in conjunction with various building structure design standards and specifications such as the "Building Structure Load Code" GBJ987, which was formulated and revised based on the "Unified Standard for Building Structure Design" GBJ68-84 approved and issued by the state in 1984, and must not be mixed with various national building structure design standards and specifications that have not been formulated and revised based on GBJ68-84. In order to improve the quality of the code, all units are requested to summarize experience and accumulate information in the process of implementing this code, and send relevant opinions and suggestions to the Institute of Foundation Engineering, China Academy of Building Research (Beijing Anwai Xiaohuangzhuang Postal Code 100013) at any time for reference in future revisions.
Ministry of Construction of the People's Republic of China
March 1989
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Main Symbols
Chapter 1
Chapter 2
Chapter 3
Section 1
Section 2
Chapter 4
Section 1
Section 2
Chapter 5
Section 1
Section 2
Section 3
Chapter 6
Section 1
Section 2bzxz.net
Section 3
Section 4
Section 5
Section 6
Chapter 7
Section 1
Section 2
Section 3
Section 4
Basic Provisions
Classification of Foundation Soil (Rock) and Engineering Property Indicators Soil (Rock) ) classification
Engineering characteristic index
Foundation burial depth
General provisions·
Foundation depth and treatment of frozen soil foundation
Foundation calculation
Bearing capacity calculation,
Deformation calculation
Stability calculation·
Mountainous area foundation
General provisions
Soil-rock combination foundation
Compacted fill foundation·
Slope and retaining wall:
Landslide prevention and control…
Karst and soil caves.
Soft foundation
General provisions
Utilization and treatment·
Architectural measures
Structural measures
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Section 5
Chapter 8
Section 1
Section 2
Section 3
Section 4||tt ||Section 5
Section 6
Section 7
Appendix 4
Appendix 5
Appendix 6
Appendix 7
Appendix 8
Appendix 9
Appendix 10
Appendix 10
Appendix 13
Appendix 14
Appendix 15
Appendix 16
Additional Notes
Large Area Ground load
Rigid foundation·
Extended foundation
Strip foundation under column:
Slab foundation under wall·
Shell foundation·
Pile foundation·
Rock anchor foundation
Key points of settlement observation·
Rock classification
Field identification of crushed stone soil·
Key points of foundation soil load test
Standard value of soil (rock) bearing capacity
Standard penetration and Key points of portable penetration test
Standard value of shear strength index c.Φ
Key points of rock foundation load test
Key points of rock uniaxial compressive strength test:
Additional stress coefficient α, average additional stress coefficient αActive earth pressure coefficient Ka of retaining wall
Calculation of additional settlement of foundation under large-area ground load...100
Internal force formula of membrane theory of shell foundation
Key points of single pile vertical static load test||tt ||Standard value of vertical bearing capacity of precast piles
Description of standard terms
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Main symbols
A——foundation bottom area,
a—compression coefficient;
b——foundation bottom width,
c——cohesion;
&——foundation burial depth, pile diameter; d. —the thickness of the permissible residual frozen soil layer under the base; d. —relative density of soil particles (specific gravity);
E.——Active earth pressure;
E. —Compression modulus of soil;
e——Void ratio;
F——Vertical force on the top of foundation,
f—Design value of foundation bearing capacity;
fo——Basic value of foundation bearing capacity;
f——Standard value of foundation bearing capacity;
f1——Saturated uniaxial compressive strength of rock;G—Dead load;
Ho—Height of foundation;
H,-Height of building from the bottom of foundation;-Height of building from the ground;
IL——Liquidity index;| |tt||Ip—Plasticity index;
L—Building length or unit length separated by settlement joints; 1—Foundation bottom length,
M—Moment acting on the foundation bottom;
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
p—Average pressure at the foundation bottom;
Po—Average additional pressure at the foundation bottom; Q—Vertical load, design value of vertical force on a single pile in pile foundation; gp—Standard value of bearing capacity of soil at pile end; 9. —Standard value of friction force of soil around pile;
R——design value of vertical bearing capacity of single pile,
——settlement,
u——peripheral length;
w——water content of soil;
——liquid limit;
——plastic limit;
standard freezing depth;
-calculated depth of foundation settlement;
——additional stress coefficient;
β——slope to horizontal Slope angle of the surface;
——gravity density of soil, referred to as soil weight; s——friction angle of soil on the back of retaining wall; 9——pressure diffusion angle of foundation;
——friction coefficient of soil on the base of retaining wall;——internal friction angle;
——bearing capacity correction factor of foundation width; na——bearing capacity correction factor of foundation burial depth;——empirical coefficient of settlement calculation;
——coefficient of influence of heating on freezing depth.
Engineering Construction Standard Information System
Engineering Construction Standard Information System
Chapter 1 General Provisions
Article 1.0.1 This specification is specially formulated to implement the national technical and economic policies in foundation design, to achieve advanced technology, reasonable economy, safety and applicability, and to ensure quality.
Article 1.0.2 The foundation design must adhere to the principle of adapting measures to local conditions and using local materials. Based on geological survey data, the structure type, material conditions and construction conditions are comprehensively considered and carefully designed.
Article 1.0.3 This code applies to the foundation design of industrial and civil buildings (including structures). The foundation design of collapsible yellow soil, permafrost soil, expansive soil, underground goaf and under earthquake and mechanical vibration loads shall still comply with the provisions of current relevant standards and specifications.
Article 1.0.4 This code is formulated in accordance with the basic principles of the national standard "Uniform Standard for Building Structure Design" GBJ68-84 and the provisions of the national standard "General Symbols, Measurement Units and Basic Terms for Building Structure Design" GBJ83-85. Article 1.0.5 When this code is used for design, the load value shall comply with the provisions of the national standard "Code for Loads on Building Structures" GBJ9-87; the calculation of the foundation shall also comply with the provisions of the national standard "Code for Design of Concrete Structures" GBJ10-89 and "Code for Design of Masonry Structures" GBJ3-88. When the foundation is in an erosive environment or affected by temperature, it shall also comply with the provisions of special codes and take corresponding protective measures. Engineering Construction Standard Full-text Information System
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Chapter 2 Basic Provisions
Article 2.0.1 According to the severity of the consequences of building damage caused by foundation damage (endangering human life, causing economic losses and social impacts and the possibility of repair), buildings are divided into three safety levels. When designing, they should be selected according to the specific situation and according to Table 2.0.1.
Building safety level
Safety level
Consequences of destruction
Very serious
Not serious
Important industrial and civil buildings; high-rise buildings with more than 20 floors, high-rise buildings with more than 14 floors with complex shapes, buildings with special requirements for foundation deformation; buildings with a single pile load of more than 4000kN
General industrial and civil buildings
Minor buildings
Article 2.0.2 According to the building safety level and the degree of influence of foundation deformation on the superstructure under long-term load, the foundation design shall comply with the following provisions: First-level buildings and second-level buildings outside the scope listed in Table 2.0.2 shall be calculated according to foundation deformation, and the calculation shall meet the requirements of Article 6.2.1 and Article 5.1.1 of this Code at the same time;
II. Table 2 .0.2 If the secondary buildings within the scope listed have any of the following conditions, deformation verification should still be carried out:
1. The standard value of foundation bearing capacity is less than 130kPa and the building is complex in shape; 2. There is ground loading on and near the foundation or the load difference between adjacent foundations is large, causing excessive uneven settlement of the foundation; 3. If the adjacent buildings on the weak foundation are too close, they may tilt; 4. There is thick or uneven fill in the foundation, and its self-weight consolidation has not been completed. Engineering Construction Standard Beach Full Text Information System
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For secondary buildings and tertiary buildings in other cases, deformation verification may not be carried out if they meet the provisions of Chapter 5, Section 1 of this Code; 3. For high-rise buildings and high structures that are often subjected to horizontal loads, as well as buildings and structures built on slopes, their stability should still be verified. Secondary buildings for which foundation deformation calculation is not required Conditions of main load-bearing layers of foundation Standard value of foundation bearing capacity fk (kPa) Slope of each soil layer (%) Masonry load-bearing structure, frame structure (number of floors) Rated lifting capacity of crane (t) Factory Room span
Crane rated
Lifting capacity (t)
Workshop span
Height (m)
Height (m)
Volume (m2)
100≤f130f160≤f200≤fx
50~100
≤100
50~100100~200 200~300|300~500500~1000The main bearing layer of the foundation refers to the depth of 3 (the width of the bottom surface of the foundation) under the bottom surface of the strip foundation and the thickness of 1.5 under the independent foundation, and the thickness is not less than 5m (except for general civil buildings below two floors);②
If there is a soil layer with a bearing capacity standard value less than 130kPa in the main bearing layer of the foundation, the design of the load-bearing structure in the table shall comply with the relevant requirements of Chapter 7 of this Code: The masonry load-bearing structure and frame structure in the table refer to civil buildings. For industrial buildings, they can be converted into the equivalent number of civil buildings according to the height and load of the factory building;④The values of the rated lifting capacity of the crane, the height of the chimney and the volume of the water tower in the table refer to the maximum value. Article 2.0.3 When determining the bottom area and burial depth of the foundation according to the bearing capacity of the foundation, the load transmitted to the bottom surface of the foundation shall be calculated according to the basic combination, the partial coefficient of the soil weight is 1.0, and the actual gravity density.
When calculating foundation deformation, the loads transmitted to the bottom surface of the foundation should be combined according to the long-term effect, and wind loads and earthquake effects should not be taken into account.
Engineering Construction Standards Full Text Information System
W0, calculated according to the actual gravity density.
When calculating the foundation deformation, the load transmitted to the bottom surface of the foundation should be combined according to the long-term effect, and wind load and earthquake action should not be included.
Engineering Construction Standard Full Text Information System
W0, calculated according to the actual gravity density.
When calculating the foundation deformation, the load transmitted to the bottom surface of the foundation should be combined according to the long-term effect, and wind load and earthquake action should not be included.
Engineering Construction Standard Full Text Information System
WArticle 3 This code applies to the foundation design of industrial and civil buildings (including structures). For the foundation design of collapsible yellow soil, permafrost soil, expansive soil, underground goaf and under earthquake and mechanical vibration loads, it shall also comply with the provisions of the current relevant standards and specifications.
Article 1.0.4 This code is formulated in accordance with the basic principles of the national standard "Uniform Standard for Building Structure Design" GBJ68-84 and the provisions of the national standard "General Symbols, Units of Measurement and Basic Terms for Building Structure Design" GBJ83-85. Article 1.0.5 When designing with this code, the load value shall comply with the provisions of the national standard "Load Code for Building Structures" GBJ9-87; the calculation of the foundation shall also comply with the provisions of the national standard "Concrete Structure Design Code" GBJ10-89 and "Masonry Structure Design Code" GBJ3-88. When the foundation is in an corrosive environment or affected by temperature, it shall also comply with the provisions of special specifications and take corresponding protective measures. Engineering Construction Standard Full-text Information System
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Chapter II Basic Provisions
Article 2.0.1 Buildings are divided into three safety levels based on the severity of the consequences of building damage caused by foundation damage (endangering human life, causing economic losses and social impacts, and the possibility of repair). During design, the safety levels should be selected according to the specific circumstances and Table 2.0.1.
Building safety level
Safety level
Consequences of destruction
Very serious
Not serious
Important industrial and civil buildings; high-rise buildings with more than 20 floors, high-rise buildings with more than 14 floors with complex shapes, buildings with special requirements for foundation deformation; buildings with a single pile load of more than 4000kN
General industrial and civil buildings
Minor buildings
Article 2.0.2 According to the building safety level and the degree of influence of foundation deformation on the superstructure under long-term load, the foundation design shall comply with the following provisions: First-level buildings and second-level buildings outside the scope listed in Table 2.0.2 shall be calculated according to foundation deformation, and the calculation shall meet the requirements of Article 6.2.1 and Article 5.1.1 of this Code at the same time;
II. Table 2 .0.2 If the secondary buildings within the scope listed have any of the following conditions, deformation verification should still be carried out:
1. The standard value of foundation bearing capacity is less than 130kPa and the building is complex in shape; 2. There is ground loading on and near the foundation or the load difference between adjacent foundations is large, causing excessive uneven settlement of the foundation; 3. If the adjacent buildings on the weak foundation are too close, they may tilt; 4. There is thick or uneven fill in the foundation, and its self-weight consolidation has not been completed. Engineering Construction Standard Beach Full Text Information System
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For secondary buildings and tertiary buildings in other cases, deformation verification may not be carried out if they meet the provisions of Chapter 5, Section 1 of this Code; 3. For high-rise buildings and high structures that are often subjected to horizontal loads, as well as buildings and structures built on slopes, their stability should still be verified. Secondary buildings for which foundation deformation calculation is not required Conditions of main load-bearing layers of foundation Standard value of foundation bearing capacity fk (kPa) Slope of each soil layer (%) Masonry load-bearing structure, frame structure (number of floors) Rated lifting capacity of crane (t) Factory Room span
Crane rated
Lifting capacity (t)
Workshop span
Height (m)
Height (m)
Volume (m2)
100≤f130f160≤f200≤fx
50~100
≤100
50~100100~200 200~300|300~500500~1000The main bearing layer of the foundation refers to the depth of 3 (the width of the bottom surface of the foundation) under the bottom surface of the strip foundation and the thickness of 1.5 under the independent foundation, and the thickness is not less than 5m (except for general civil buildings below two floors);②
If there is a soil layer with a bearing capacity standard value less than 130kPa in the main bearing layer of the foundation, the design of the load-bearing structure in the table shall comply with the relevant requirements of Chapter 7 of this Code: The masonry load-bearing structure and frame structure in the table refer to civil buildings. For industrial buildings, they can be converted into the equivalent number of civil buildings according to the height and load of the factory building;④The values of the rated lifting capacity of the crane, the height of the chimney and the volume of the water tower in the table refer to the maximum value. Article 2.0.3 When determining the bottom area and burial depth of the foundation according to the bearing capacity of the foundation, the load transmitted to the bottom surface of the foundation shall be calculated according to the basic combination, the partial coefficient of the soil weight is 1.0, and the actual gravity density.
When calculating foundation deformation, the loads transmitted to the bottom surface of the foundation should be combined according to the long-term effect, and wind loads and earthquake effects should not be taken into account.
Engineering Construction Standards Full Text Information System
WArticle 3 This code applies to the foundation design of industrial and civil buildings (including structures). For the foundation design of collapsible yellow soil, permafrost soil, expansive soil, underground goaf and under earthquake and mechanical vibration loads, it shall also comply with the provisions of the current relevant standards and specifications.
Article 1.0.4 This code is formulated in accordance with the basic principles of the national standard "Uniform Standard for Building Structure Design" GBJ68-84 and the provisions of the national standard "General Symbols, Units of Measurement and Basic Terms for Building Structure Design" GBJ83-85. Article 1.0.5 When designing with this code, the load value shall comply with the provisions of the national standard "Load Code for Building Structures" GBJ9-87; the calculation of the foundation shall also comply with the provisions of the national standard "Concrete Structure Design Code" GBJ10-89 and "Masonry Structure Design Code" GBJ3-88. When the foundation is in an corrosive environment or affected by temperature, it shall also comply with the provisions of special specifications and take corresponding protective measures. Engineering Construction Standard Full-text Information System
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Chapter II Basic Provisions
Article 2.0.1 Buildings are divided into three safety levels based on the severity of the consequences of building damage caused by foundation damage (endangering human life, causing economic losses and social impacts, and the possibility of repair). During design, the safety levels should be selected according to the specific circumstances and Table 2.0.1.
Building safety level
Safety level
Consequences of destruction
Very serious
Not serious
Important industrial and civil buildings; high-rise buildings with more than 20 floors, high-rise buildings with more than 14 floors with complex shapes, buildings with special requirements for foundation deformation; buildings with a single pile load of more than 4000kN
General industrial and civil buildings
Minor buildings
Article 2.0.2 According to the building safety level and the degree of influence of foundation deformation on the superstructure under long-term load, the foundation design shall comply with the following provisions: First-level buildings and second-level buildings outside the scope listed in Table 2.0.2 shall be calculated according to foundation deformation, and the calculation shall meet the requirements of Article 6.2.1 and Article 5.1.1 of this Code at the same time;
II. Table 2 .0.2 If the secondary buildings within the scope listed have any of the following conditions, deformation verification should still be carried out:
1. The standard value of foundation bearing capacity is less than 130kPa and the building is complex in shape; 2. There is ground loading on and near the foundation or the load difference between adjacent foundations is large, causing excessive uneven settlement of the foundation; 3. If the adjacent buildings on the weak foundation are too close, they may tilt; 4. There is thick or uneven fill in the foundation, and its self-weight consolidation has not been completed. Engineering Construction Standard Beach Full Text Information System
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For secondary buildings and tertiary buildings in other cases, deformation verification may not be carried out if they meet the provisions of Chapter 5, Section 1 of this Code; 3. For high-rise buildings and high structures that are often subjected to horizontal loads, as well as buildings and structures built on slopes, their stability should still be verified. Secondary buildings for which foundation deformation calculation is not required Conditions of main load-bearing layers of foundation Standard value of foundation bearing capacity fk (kPa) Slope of each soil layer (%) Masonry load-bearing structure, frame structure (number of floors) Rated lifting capacity of crane (t) Factory Room span
Crane rated
Lifting capacity (t)
Workshop span
Height (m)
Height (m)
Volume (m2)
100≤f130f160≤f200≤fx
50~100
≤100
50~100100~200 200~300|300~500500~1000The main bearing layer of the foundation refers to the depth of 3 (the width of the bottom surface of the foundation) under the bottom surface of the strip foundation and the thickness of 1.5 under the independent foundation, and the thickness is not less than 5m (except for general civil buildings below two floors);②
If there is a soil layer with a bearing capacity standard value less than 130kPa in the main bearing layer of the foundation, the design of the load-bearing structure in the table shall comply with the relevant requirements of Chapter 7 of this Code: The masonry load-bearing structure and frame structure in the table refer to civil buildings. For industrial buildings, they can be converted into the equivalent number of civil buildings according to the height and load of the factory building;④The values of the rated lifting capacity of the crane, the height of the chimney and the volume of the water tower in the table refer to the maximum value. Article 2.0.3 When determining the bottom area and burial depth of the foundation according to the bearing capacity of the foundation, the load transmitted to the bottom surface of the foundation shall be calculated according to the basic combination, the partial coefficient of the soil weight is 1.0, and the actual gravity density.
When calculating foundation deformation, the loads transmitted to the bottom surface of the foundation should be combined according to the long-term effect, and wind loads and earthquake effects should not be taken into account.
Engineering Construction Standards Full Text Information System
WThere is thick or uneven fill in the foundation, and its self-weight consolidation has not been completed. Engineering Construction Standards Full Text Information System
W Engineering Construction Standards Full Text Information System
For secondary buildings and tertiary buildings in other cases, deformation verification may not be performed if they meet the requirements of Chapter 5, Section 1 of this Code; 3. For high-rise buildings and high structures that are often subjected to horizontal loads, as well as buildings and structures built on slopes, their stability should also be verified. Scope of secondary buildings for which foundation deformation calculation is not requiredMain force-bearing layer of foundationConditions of the main force-bearing layer of foundationStandard value of foundation bearing capacityfk(kPa)Slope of each soil layer(%)Masonry load-bearing structure, frame structure (number of floors)Crane rated lifting capacity(t)Factory Room span
Crane rated
Lifting capacity (t)
Workshop span
Height (m)
Height (m)
Volume (m2)
100≤f130f160≤f200≤fx
50~100
≤100
50~100100~200 200~300|300~500500~1000The main bearing layer of the foundation refers to the depth of 3 (the width of the bottom surface of the foundation) under the bottom surface of the strip foundation and the thickness of 1.5 under the independent foundation, and the thickness is not less than 5m (except for general civil buildings below two floors);②
If there is a soil layer with a bearing capacity standard value less than 130kPa in the main bearing layer of the foundation, the design of the load-bearing structure in the table shall comply with the relevant requirements of Chapter 7 of this Code: The masonry load-bearing structure and frame structure in the table refer to civil buildings. For industrial buildings, they can be converted into the equivalent number of civil buildings according to the height and load of the factory building;④The values of the rated lifting capacity of the crane, the height of the chimney and the volume of the water tower in the table refer to the maximum value. Article 2.0.3 When determining the bottom area and burial depth of the foundation according to the bearing capacity of the foundation, the load transmitted to the bottom surface of the foundation shall be calculated according to the basic combination, the partial coefficient of the soil weight is 1.0, and the actual gravity density.
When calculating foundation deformation, the loads transmitted to the bottom surface of the foundation should be combined according to the long-term effect, and wind loads and earthquake effects should not be taken into account.
Engineering Construction Standards Full Text Information System
WThere is thick or uneven fill in the foundation, and its self-weight consolidation has not been completed. Engineering Construction Standards Full Text Information System
W Engineering Construction Standards Full Text Information System
For secondary buildings and tertiary buildings in other cases, deformation verification may not be performed if they meet the requirements of Chapter 5, Section 1 of this Code; 3. For high-rise buildings and high structures that are often subjected to horizontal loads, as well as buildings and structures built on slopes, their stability should also be verified. Scope of secondary buildings for which foundation deformation calculation is not requiredMain force-bearing layer of foundationConditions of the main force-bearing layer of foundationStandard value of foundation bearing capacityfk(kPa)Slope of each soil layer(%)Masonry load-bearing structure, frame structure (number of floors)Crane rated lifting capacity(t)Factory Room span
Crane rated
Lifting capacity (t)
Workshop span
Height (m)
Height (m)
Volume (m2)
100≤f130f160≤f200≤fx
50~100
≤100
50~100100~200 200~300|300~500500~1000The main bearing layer of the foundation refers to the depth of 3 (the width of the bottom surface of the foundation) under the bottom surface of the strip foundation and the thickness of 1.5 under the independent foundation, and the thickness is not less than 5m (except for general civil buildings below two floors);②
If there is a soil layer with a bearing capacity standard value less than 130kPa in the main bearing layer of the foundation, the design of the load-bearing structure in the table shall comply with the relevant requirements of Chapter 7 of this Code: The masonry load-bearing structure and frame structure in the table refer to civil buildings. For industrial buildings, they can be converted into the equivalent number of civil buildings according to the height and load of the factory building;④The values of the rated lifting capacity of the crane, the height of the chimney and the volume of the water tower in the table refer to the maximum value. Article 2.0.3 When determining the bottom area and burial depth of the foundation according to the bearing capacity of the foundation, the load transmitted to the bottom surface of the foundation shall be calculated according to the basic combination, the partial coefficient of the soil weight is 1.0, and the actual gravity density.
When calculating foundation deformation, the loads transmitted to the bottom surface of the foundation should be combined according to the long-term effect, and wind loads and earthquake effects should not be taken into account.
Engineering Construction Standards Full Text Information System
W
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