JGJ 6-1980 Design and construction specification for box foundation of high-rise buildings JGJ6-80
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Information System
Standard of the State Administration of Construction Engineering
Box Foundation of High-Rise Building
Design and Construction Specifications
JGJ7—91
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Standard of the State Administration of Construction Engineering
Design and Construction Specifications of Box Foundation of High-Rise Building JGJ6—80
Editor Department: China Academy of Building Research Approval Department:
Approved by the State Administration of Construction Engineering
Reported to the State Capital Construction Commission for the record
Trial Implementation Date: July 1, 1981
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(80)Jiangongkezi No. 825
According to the National Construction Science and Technology Development Plan of the State Construction Commission in 1978, and in order to meet the needs of the development of high-rise buildings in my country, the "Code for Design and Construction of Box Foundations of High-rise Buildings" compiled by the China Academy of Building Research in conjunction with relevant units has been reviewed and approved as a ministerial standard with the number JGJ6-80, which will be implemented on a trial basis from July 1, 1981. In view of the fact that the box foundation of high-rise buildings in my country is still in the development stage, it is hoped that all units will pay attention to summarizing experience, proposing amendments and supplementary opinions when trying out this code, and inform the China Academy of Building Research at any time so that it can be revised in the future. State Administration of Construction Engineering
November 15, 1980
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Preparation Instructions
According to the requirements of the "1978 National Construction Science and Technology Development Plan" of the State Construction Commission on the design and calculation methods of high-rise building structures and the "1978 National Construction Science and Technology Development Plan" In accordance with the arrangement of item 58 of the "1999 National Building Science and Technology Development Plan", in order to summarize the practical experience and scientific research results of the investigation, design and construction of box foundations of high-rise buildings in my country, the Building Science and Technology Bureau of the State Construction Commission entrusted our institute to form a compilation team together with Beijing Institute of Building Design, Beijing Survey Office, Beijing University of Technology, Shanghai Industrial Building Design Institute, Tongji University, Shanghai Civil Building Design Institute, Shanghai Geological Bureau, Shaanxi Provincial Building Design Institute and Fujian Industrial and Civil Building Design Institute to compile the "Design and Construction Code for Box Foundations of High-rise Buildings" to meet the needs of the growing development of high-rise buildings in my country. In November 1978, the compilation outline of this code was passed at the "Technical Experience Exchange Meeting on the Design of Box Foundations of High-rise Buildings", and the draft for soliciting opinions of this code was completed in April 1979. In September 1979, according to the opinions of relevant scientific research, design, construction units and colleges and universities across the country, the draft for review was revised and completed. In November 1979, the Foundation Academic Committee of the Architectural Society of China discussed the draft for review, and a review group composed of some experts and professors reviewed it. According to the review opinions, it was revised and supplemented to complete this draft. In view of the fact that the box foundation of high-rise buildings in my country is still developing, it is necessary to continue to gain experience in practice. When using this code, if any unit finds that there is a need for modification or supplementation, please send your opinions and relevant information to our institute at any time for future revisions.
China Academy of Building Research
September 1998
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Chapter 3
Chapter 4
Chapter 5
Acknowledgements IV
Appendix V
Survey requirements
Foundation calculation
Foundation design and construction requirements·
Construction requirements
Empirical coefficient mz for settlement calculation
Approximate calculation method for shear force of wall section
Example of overall bending moment calculation
Terms used in this code
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Main symbols||t t||A——vertical cross-sectional area of the wall,
calculated cross-sectional area of the first upper lintel;
calculated cross-sectional area of the second lower lintel;
area of additional vertical reinforcement on each side of the opening;
area of additional inclined reinforcement at the opening;
width of the box foundation;
thickness of the wall or the slab width taken for calculation;
elastic modulus of concrete of beams and columns;
elastic modulus of concrete of the box foundation;
elastic modulus of concrete of the continuous reinforced concrete wall connected to the box foundation in the bending direction;
base area:
building height;
wall height;
-height of the upper column of the i-th floor;
height of the lower column of the i-th floor;
effective height of the slab;
section height of the first upper lintel degree;
Cross-sectional height of the lower lintel;
Cross-sectional moment of inertia of the ith-story beam,
Cross-sectional moment of inertia of the upper column of the ith-story;
Cross-sectional moment of inertia of the lower column of the ith-story;
Cross-sectional moment of inertia of the continuous steel energy temperature filter wall connected to the foil foundation in the bending direction;
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-Safety factor
K——Linear stiffness of the ith-story beam;
-Linear stiffness of the upper column of the ith-story
-Linear stiffness of the lower column of the ith-story;
Total length of the upper structure in the bending direction;
-Column spacing or opening width in the bending direction of the upper structure; Bending moment caused by overall bending,Www.bzxZ.net
Bending moment at the end of the upper lintel ;
Bending moment at the end of the lower lintel;
Number of spans in the bending direction;
Empirical coefficient for settlement calculation;
Number of floors of the building;
Average pressure at the bottom of the foundation;
Maximum pressure at the edge of the bottom of the foundation:
Minimum pressure at the edge of the bottom of the foundation;
-Shear force of the vertical section of the wall or the shear force at the center of the opening; The shear force borne by the slab minus the load within the rigid angle range; Allowable bearing capacity of foundation soil;
Corrected allowable bearing capacity of foundation soil;
Design strength of concrete axial compression;
Design strength of concrete tension;
Perimeter at the point where the load edge is;
Resistance moment of the bottom of the foundation;
Calculated value of the overall inclination;
-Opening coefficient.
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Chapter 1 General
Article 1-0-1 This code is applicable to the box foundation of high-rise civil buildings with reinforced concrete frame structures and cast-in-place shear wall structures with eight to twenty floors on natural foundations or a building height of no more than 60 and a half. When the conditions of frame-shear wall structures and multi-story industrial buildings are equivalent to the requirements of this code, they can also be used as a reference
Note: The building height refers to the height from the outdoor floor to the roof (excluding local auxiliary buildings such as elevator rooms and water tank rooms protruding from the roof).
Article 1-0-2 The box foundation referred to in this code mainly refers to a reinforced concrete box structure with good overall rigidity composed of a bottom plate, a top plate, side walls and a certain number of internal partition walls.
Article 1-0-3 The design of the box foundation shall comprehensively consider the geological conditions, construction methods and use requirements of the entire construction site, and appropriately consider the joint effect of the foundation and the superstructure and the mutual influence with the adjacent buildings. Article 1-0-4 The depth of the box foundation must meet the requirements of foundation strength and stability, so as to reduce the overall tilt of the building, prevent overturning and sliding, and the burial depth in the earthquake zone should not be less than one tenth of the building height. Article 10-0-5 High-rise buildings with anti-vibration, large defense and basement requirements should adopt box foundations.
Article 1-0-6 For high-rise buildings of major or scientific research value, in addition to settlement observation, tests such as pit rebound, base reaction force and foundation internal force shall be carried out.
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Article 1-0-7 When adopting this code, it shall also comply with the requirements of relevant current standards and specifications of my country.
Chapter II Survey Requirements
Article 2-0-1 The survey of the foundation shall clarify the suitability of the box foundation through the following work and provide relevant information. 1. Find out whether there are adverse engineering geological phenomena, ancient river channels or artificial caves near the building that affect the stability of the project. In the earthquake zone, it shall be found out whether there are liquefiable strata and provide relevant parameters required for seismic design. 2. Find out the uniformity of the stratum soil and groundwater conditions within the influence range of the building, and evaluate the strength and deformation indicators of the foundation soil. 3. When necessary, relevant information on foundation pit excavation and artificial lowering of groundwater levels required for design and construction shall be provided.
Article 2-0-2 The arrangement of the boreholes shall be sufficient to evaluate the uniformity of the stratum soil in both the vertical and horizontal directions of the building. The number of boreholes for each individual high-rise building shall not be less than four, of which no less than two shall be control boreholes. The spacing between boreholes shall be determined according to the complexity of stratum changes and the specific requirements of buildings, in accordance with the provisions of the spacing between exploration points for Class T buildings in the Code for Geological Survey for Industrial and Civil Construction Engineering (TJ21-77), but the maximum spacing shall not exceed 35 meters. Article 2-0-3 The depth of the controlled borehole is generally 10 to 2.0 times the width of the box foundation from the bottom surface of the foundation. If bedrock, solid soil or soft strata are encountered within this depth range, Article 30 of the Code for Geological Survey for Industrial and Civil Construction Engineering (TJ21-77) shall be followed. Article 2-0-4 The quality of drilling sampling shall be guaranteed. If necessary, in-situ tests such as static and dynamic penetration, wave velocity test, cross plate shear test and static load test can be carried out in areas with conditions. For dynamic penetration test, the standard penetration depth of the borehole may not be limited to 21 meters. Article 2-0-5 In geotechnical tests, a certain number of shear tests and consolidation tests should be included. For major projects or projects with scientific research value, the following or other tests should be carried out to make a comprehensive evaluation of the strength and deformation of the foundation. 1. Consolidation test of initial consolidation pressure and repeated loading and unloading; triaxial compression test. Chapter 3 Foundation Calculation Article 3-0-1 The strength and deformation calculation of the box foundation should be carried out, and the stability of the foundation should be verified when necessary.
Article 3-0-2 The base pressure p, Pmax, and Pmmn of the box foundation shall be calculated according to formulas (13), (14), and (15) in the Code for Design of Foundations for Industrial and Civil Buildings (TJ7-74) (the buoyancy of groundwater shall be deducted from the foundation part below the groundwater level), and shall meet the requirements of the following formula: Non-seismic area
Pmax≤1.2R
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(3-0-2-1)
(3-0-2-1)
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Pmin>0
II. Earthquake Zone
(3-0-2—3)
The load combination shall be implemented in accordance with the Code for Seismic Design of Industrial and Civil Buildings (TJ11-78). In addition to meeting the requirements of formulas (3-0-2-1) and (3-0-2-2), the foundation strength shall also meet the requirements of the following formula: Pmax
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