JGJ 68-1990 Code for seismic design and construction of porous brick (kp1 type) buildings JGJ68-90
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Industry Standard of the People's Republic of China
Seismic Design of Buildings with Perforated Bricks (Type KP1)
and Construction Specifications
JGJ68—90
1991Beijing
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Industry Standard of the People's Republic of China
Seismic Design of Buildings with Perforated Bricks (Type KP1)
and Construction Specifications
JGJ68—90
Editor: China Academy of Building ResearchApproval Department: People's Republic of China Ministry of Construction of the People's Republic of China Effective Date: October 1, 1990
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Notice on the Release of the Industry Standard "Regulations for Seismic Design and Construction of Porous Brick (KPI Type) Buildings" (90) Jianbiaozi No. 89
According to the notice of the former Ministry of Urban and Rural Construction and Environmental Protection (87) Chengkezi No. 268, the "Regulations for Seismic Design and Construction of Porous Brick (KP1 Type) Buildings" edited by the China Academy of Building Research has been reviewed and approved by our ministry as an industry standard, numbered JGJ68-90, and will be implemented from October 1, 1990. If you have any questions or comments during the implementation process, please inform the China Academy of Building Research, the editor of this standard, by letter. Ministry of Construction of the People's Republic of China
March 8, 1990
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Preparation Instructions
This code is prepared by the China Academy of Building Research in conjunction with Beijing Architectural Design Institute, Shaanxi Provincial Institute of Building Science, China Northwest Architecture Design Institute, Sichuan Provincial Institute of Building Science
Tongji University, Xi'an Institute of Metallurgy and Architecture and other seven units in accordance with the notice of the former Ministry of Urban and Rural Construction and Environmental Protection (87) Chengkezi No. 268. During the preparation process, after experimental research, earthquake damage investigation and solicitation of opinions from all over the country in various ways, after many discussions and revisions, it was finally reviewed and finalized by the Ministry of Construction and relevant departments.
This code consists of 6 chapters and 3 appendices, including general provisions, material strength grades and main calculation indicators of masonry, general provisions for seismic design, verification of earthquake action and seismic bearing capacity, seismic structural measures, construction technical requirements and quality inspection. Although this code has been discussed and revised many times, it still needs to be supplemented, revised and improved from practice. If any unit finds any need for modification and supplementation during implementation, please send your opinions and relevant materials to the Institute of Earthquake Resistance Engineering, China Academy of Building Research, Xiaohuangzhuang, Anwai, Beijing (Postal Code: 100013) for reference in future revisions. China Academy of Building Research
January 1990
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Chapter 1
Chapter 2
Chapter 3
Chapter 4
Chapter 5
Chapter 6
Material Strength Grade and Main Calculation Indexes of Masonry
General Provisions for Seismic Design
Verification of Seismic Action and Seismic Bearing Capacity
Seismic Structural Measures
Construction Technical Requirements and Quality Inspection
Section 1
Section 2
Section 3
Construction Preparation
Construction Requirements
Quality Inspection
Term Explanation
(17)||t t||（18）
（19)
00060606606600006860680660606665068068o666060660000080eCalculation of lateral displacement stiffness of wall
Explanation of terms used in this code
Additional remarks
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Main symbols
Actions and effects
Standard value of total horizontal seismic action on the structure;
Representative value of equivalent total gravity load on the structure (component) during earthquake; - shear force;
-Average compressive stress in the wall cross section;
Representative value of gravity benefit load on the structure (component) during earthquake: Standard value of permanent load on accessories of structural components; - Standard value of variable load.
Resistance and material indexes
Strength grade of porous bricks,
Strength grade of mortar;
Strength grade of concrete;
Design value of compressive strength of porous brick masonry;
Design value of shear strength of porous brick masonry;
Design value of seismic shear strength of masonry along stepped cross-section failure;-Stiffness of wall (component);
Elastic modulus of porous brick masonry;
Shear modulus of porous brick masonry.
Geometric parameters
-Gross area of wall cross section,
B, b-Structure (wall or window wall) width; H, h-Structure (house, interlayer wall, door hole wall, window hole wall) height; Calculate the equivalent height of wall members.
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Calculation coefficient
Seismic adjustment coefficient of bearing capacity;
-Adjustment coefficient of masonry strength;
Maximum value of horizontal earthquake influence coefficient;
Positive stress influence coefficient of masonry strength,
Partial coefficient of horizontal earthquake action
Effect coefficient of horizontal earthquake action;
-Combination value coefficient of variable load.
-Quantity (such as the number of floors, the number of mass points, the number of wall members, etc.); m, n-
-Sequence (such as the ith floor, the ith mass point, the ith wall member, etc.). Engineering Construction Standard Full Text Information System
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Chapter 1 General
Article 1.0.1 This code is specially formulated to implement the principle of prevention-oriented earthquake work, make the design and construction of sintered clay porous brick buildings economical and reasonable, ensure quality, avoid casualties, and reduce earthquake losses. Article 1.0.2 This code is applicable to the seismic design and construction of sintered clay porous brick (KP1 type) multi-story houses in areas with seismic fortification intensity of 6 to 9 degrees. For houses of other types of porous bricks, when there are reliable test data, this code can also be used as a reference.
Note: ① The dimensions of KPi type sintered clay porous bricks are 240mm×115mm×90mm, the pore diameter is 18～22mm, and the porosity is generally not more than 25%, hereinafter referred to as porous bricks, ③ This code generally omits the words "design intensity", such as the design intensity is 6 degrees, 7 degrees, 8 degrees, 9 degrees. It is referred to as "6 degrees, 7 degrees, 8 degrees, 9 degrees". Article 1.0.3 The porous brick houses designed and constructed according to this code, when subjected to frequent earthquakes lower than the design intensity of the area, generally will not be damaged or need no repair and can continue to be used; when subjected to earthquakes of the design intensity of the area, there may be some damage, and it can continue to be used after general repair or without repair; when subjected to the estimated rare earthquake with a higher intensity than the design intensity of the area, it will not collapse or cause serious damage that endangers life.
Article 1.0.4 When carrying out earthquake-resistant design and construction in accordance with this code, the requirements of other relevant national standards, specifications and codes shall also be met. Engineering Construction Standard Full-text Information System
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Chapter 2 Material Strength Grade and Main Calculation Indexes of Masonry Article 2.0.1 The strength grade of porous bricks and masonry mortar shall be adopted in accordance with the following provisions
, the strength grade of porous bricks: MU20, MU15, MU10, MU7.5;, the strength grade of masonry mortar: M10, M7.5, M5, M2.5. Note: Bricks with strength grade MU7.5 are limited to multi-story houses with 4 floors or less. Article 2.0.2 The design values of compressive strength and shear strength of porous brick masonry with an age of 28 days and calculated based on gross cross-section shall be adopted in accordance with Table 2.0.2-1 and Table 2.0.2-2, respectively, based on the strength grades of porous bricks and mortar. Design value of compressive strength of porous brick masonry (MPa) Mortar strength grade
Brick strength grade
Table 2.0.2-1
Mortar strength
Note: For newly built porous brick masonry where the mortar has not yet hardened during the construction stage, the design value of compressive strength can be determined based on the case where the mortar strength is zero in Table 2.0.2-1.
Design value of shear strength of porous brick masonry f, ((MPa) mortar strength, etc.
Pit shear strength
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Table 2.0.2-2
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Section 2.0.Article 3 For the porous brick masonry in the following cases, the design values of compressive strength and shear strength shall be multiplied by the following strength adjustment coefficients respectively: 1. When the span of the beam is not less than 9m, the strength adjustment coefficient for the masonry under the beam is 0.9.
2. When the gross cross-sectional area of the masonry is less than 0.3m2, the strength adjustment coefficient shall be determined by the following formula:
￥=07±A
va——strength adjustment coefficient;
A——gross cross-sectional area of masonry (m).
3. When cement mortar is used for masonry, the strength adjustment coefficient shall be 0.85 for the design values of masonry compressive strength in Table 2.0.2-1; the strength adjustment coefficient shall be 0.75 for the design values of masonry shear strength in Table 2.0.2-2. Article 2.0.4 The elastic modulus of porous brick masonry can be adopted according to Table 2.0.4, and the shear modulus of masonry can be approximately 0.4 times the elastic modulus. Elastic modulus E (MPa) of porous brick masonry Mortar strength grade
Elastic modulus valuebzxz.net
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Chapter 3 General provisions for earthquake-resistant design
Article 3.0.1 The design and layout of porous brick houses should comply with the following provisions: 1. The layout of the plane and elevation of the building should be regular and symmetrical, the mass distribution and stiffness change of the building should be uniform, and the floors should not have staggered floors. 2. The layout of the vertical and horizontal walls should be evenly symmetrical, aligned along the plane, continuous up and down along the vertical direction, and the windows on the same axis should be uniform. 3. Staircases should not be set at the ends and corners of the house. 4. Structural systems with horizontal walls bearing the load or vertical and horizontal walls bearing the load together should be preferred. Article 3.0.2 The floor height of porous brick houses should not exceed 4m. The total height and number of floors of porous brick houses should not exceed the provisions of Table 3.0.2. Total height (m) and number of floors of porous brick houses Minimum wall thickness
Note: The total height of a house refers to the height from the outdoor ground to the entrance. When it is a semi-basement, the total height can be calculated from the indoor floor of the basement; when it is a full basement, the total height can be calculated from the outdoor ground. Article 3.0.3 For porous brick houses with fewer transverse walls such as hospitals and schools, the total height should be reduced by 3m compared with the provisions of Table 3.0.2, and the number of floors should be reduced by 1 accordingly; for houses with few transverse walls on each floor, the total height and number of floors should be appropriately reduced according to their physical conditions. Article 3.0.4 In addition to meeting the seismic bearing capacity verification, the maximum spacing of seismic transverse walls shall comply with the provisions of Table 3.0.4.
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Maximum spacing of seismic transverse walls (m)
Floor (roof) category
Cast-in-place and assembled integral reinforced concrete
Assembled reinforced concrete
Article 3.0.5
Regulations.
The local dimension limit of porous brick houses should comply with the local dimension limit of porous brick houses in Table 3.0.5 (m)
Minimum width of load-bearing window wall
Minimum distance from the end of load-bearing external wall to the edge of door and window openings
Minimum distance from the end of non-load-bearing external wall to the edge of door and window openings
Minimum distance from the end of load-bearing external wall to the edge of door and window openings
Maximum height of non-anchored parapet (not at the entrance and exit) 6 degrees
Article 3.0.6 The maximum ratio of the total height to the total width of porous brick houses shall comply with the provisions of Table 3.0.6.
Maximum ratio of the total height to the total width of porous brick houses 6 degrees and 7 degrees
Note: The width of a single-sided corridor or cantilevered corridor is not included in the total width of the house. Table 3.0.6
Article 3.0.7: For porous brick houses with 8 and 9 degrees, if one of the following conditions occurs, anti-expansion joints should be set
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