JGJ/T 14-1995 Technical specification for small concrete hollow blocks JGJ/T14-95
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Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Specification for ConcreteSmall-SizedHollowBlockMasonry,BuildingJGJ/T14-95
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Specification for ConcreteSmall-SizedHollowBlockMasonry,BuildingJGJ/T14-95
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Specification for ConcreteSmall-SizedHollowBlockMasonry,Building Concrete Small-Sized Hollow Block Masonry, Building JGJ/T14—95
Editor: Sichuan Institute of Building Science Approval Department: Ministry of Construction of the People's Republic of China Effective Date: December 1, 1995
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About the release of the industry standard "Concrete Small Hollow Block Building Technical Specifications" Notice of Construction Standard [1995] No. 323
To the Construction Committees (Construction Departments) of all provinces, autonomous regions, and municipalities directly under the Central Government, the Construction Committees of cities with independent planning status, and relevant departments of the State Council:
According to the requirements of the Ministry of Construction's Construction Standard [1991] No. 727, the "Technical Specifications for Small Hollow Concrete Block Buildings" jointly revised by the Sichuan Provincial Academy of Building Sciences and Harbin University of Architecture and other relevant units has been reviewed and approved as a recommended industry standard, numbered JGJ/T14-95, and will be implemented from December 1, 1995. The original "Design and Construction Specifications for Small Hollow Concrete Block Buildings" JGJ14-82 will be abolished at the same time. This standard is managed by the China Academy of Building Research, the Ministry of Construction's construction engineering standard technology management unit, and the Sichuan Provincial Academy of Building Sciences is responsible for interpretation. This standard is organized and published by the Standard and Quota Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
June 8, 1995
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1 General
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Calculation indexes of materials and masonry...
4 Static design
4.1 Basic design provisions
4.2 Calculation of bearing capacity of compression members
Calculation of bearing capacity of local compression
4.4 Permissible height-to-thickness ratio of walls and columns.
General structural requirements
4.6 Main measures to prevent wall cracking·
4.7 Ring beam, lintel, core column.
5 Earthquake-resistant design
General provisions
52 Earthquake action and structural earthquake-resistant verification
5.3 Earthquake-resistant structural measures
6 Construction and acceptance
6.1 Construction preparation
6.2 Basic requirements for construction
Winter construction
6.5 Masonry engineering quality standards
6.6 Masonry engineering acceptance
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Appendix A. Axial force influence coefficient Number.
Appendix B
Explanation of terms used in this standard
Additional explanation
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80080400.
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1 General
1.0.1 This code is formulated to make the design and construction of concrete small hollow block masonry structures adapt to local conditions, use local materials, reduce earthquake damage, and be technologically advanced, economically reasonable, safe and applicable, and ensure quality. 2 This code is applicable to the design and construction of masonry structures using concrete small hollow blocks as wall materials in non-seismic fortification areas and areas with seismic fortification intensity of 6 to 8 degrees1.0.2
1.0.3
3This code is revised according to the principles of the current national standard "Uniform Standard for Building Structure Design", and the symbols, measurement units and basic terms are adopted in accordance with the provisions of the current national standard "General Symbols, Measurement Units and Basic Terms for Building Structure Design". 1.0.4 In the design and construction of concrete small hollow block masonry structures, in addition to complying with this code, it should also comply with the provisions of the current national standards "Masonry Structure Design Code" GBJ3, "Building Seismic Design Code" GBJ11, "Concrete Structure Design Code" GBJ10, "Building Thermal Design Code" GBJ50176, etc. Engineering Construction Standard Full Text Information System
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2 Terms and Symbols
2.1 Terms
2.1.1 Ordinary Concrete Small Hollow Blocks
Concrete made of crushed stone or pebbles as coarse aggregate, with the main specification size of 390mmX190mm×190mm and a hollow rate of 25% to 50%, referred to as ordinary concrete small blocks.
2.1.2 Lightweight Aggregate Concrete Small Hollow Blocks Concrete small hollow blocks made of pumice, volcanic ash, coal slag, natural coal grinding stone, and ceramsite as coarse aggregates, referred to as light aggregate concrete small blocks. 2.1.3 Single-row hole small blocks
Small blocks with only one row of holes along the thickness direction. 2.1.4 Double-row or multi-row small blocks
Small blocks with double-row strip holes or multi-row strip holes along the thickness direction. 2.1.5 When building a wall with opposite holes
, the holes of the small blocks in the upper and lower layers are aligned. 2.1.6 When building a wall with staggered holes
, the holes of the small blocks in the upper and lower layers are staggered. 2.1.7 When building a wall with reverse masonry
, the bottom surface of the small blocks faces upward. 2.1.8 Core columns
The holes of a small block wall with concrete poured in are called plain concrete core columns; the holes of a small block wall with steel bars inserted and concrete poured in are called reinforced concrete core columns. No.
2.2.1 Geometric parameters
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A—gross area of component section,
A1——local compression area;
Aea——total area of core column section;
Ao——calculated area affecting local compressive strength; Ab
—pad area;
A. ——Rebar cross-sectional area;
B——Total width of the structure,
H——Total height of the structure or wall, component height; H.
——Height of the first floor;
——Calculated height of the component;
Total length of the structure (unit),
——Distance, side length, actual support length of the beam end;
6——Section width, side length;
bt——Calculated section flange width of the wall with pilasters, calculated width of the wing wall; b,——In The width of the door and window openings within the range of adjacent transverse walls, window walls or pilasters;
The distance between adjacent transverse walls, window walls or pilasters; the distance from the point of action of the resultant axial force to the center of gravity of the section, referred to as the eccentric moment, h-the thickness of the wall or the side length of the rectangular section in the eccentric direction of the axial force, the height of the beam,
hb——the height of the small block;
ho——the effective height of the section;
-the reduced thickness of the T-shaped section;
the distance from the center of gravity of the section to the edge of the section in the direction of the axial force. 2 Actions, effects and resistance
f1——the average compressive strength of small blocks; f2—the average compressive strength of mortar;
f——the design value of the compressive strength of masonry;
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fm—Design value of masonry bending tensile strength
f, design value of masonry shear strength;
fve——Design value of masonry seismic shear strength; f, design value of steel bar tensile strength;
—Stiffness of a structure (component);
f. —Design value of concrete axial compressive strength; N
-Design value of axial force;
-Standard value of axial force;
-Design value of axial force on local compression area, design value of beam end support pressure, -Design value of upper axial force;
-Design value of bending moment;
-Design value of shear force;
-Design value of concentrated force;
-Standard value of total horizontal seismic action of structure;
Representative value of equivalent total gravity load of structure (component) during earthquake; Average compressive stress generated by standard value of constant load. Calculation coefficient
Partial coefficient of material properties of structural members;
Adjustment coefficient;
Local compressive strength improvement coefficient;
Bearing capacity seismic adjustment coefficient,
Maximum value of horizontal earthquake influence coefficient;
Combination value coefficient, influence coefficient;
Height-to-thickness ratio of walls and columns,
Axial force influence coefficient;
s—Calculation coefficient, local pressure coefficient;
In—Component slenderness ratio, proportional coefficient; p—Reinforcement ratio, ratio;
M——Correction coefficient of allowable height-to-thickness ratio of non-load-bearing walls; Engineering Construction Standard Full-text Information System
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2——Correction coefficient of allowable height-to-thickness ratio of walls with door and window openings. 2.2.4 Others
MU—Strength grade of small masonry blocks;
M——Strength grade of mortar;
-Total number, such as the number of floors, the number of mass points, the number of steel bars, the number of spans, etc. n
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3 Calculation indexes of materials and masonry
1 The strength grade of small masonry blocks and mortar shall be adopted in accordance with the following provisions: 3.0.1
Strength grade of small masonry: MU20, MU15, MU10, MU7.5, MU5, MU3.5.
Strength grade of mortar: M10, M7.5, M5, M2.5. Note: When determining the strength grade of small concrete blocks containing more than 15% fly ash, the compressive strength of the blocks shall be multiplied by the carbonization coefficient.
2For single-row hole concrete small blocks with main specifications of 390mmX190mmX190mm, when the holes are laid, the design value of the masonry compressive strength calculated based on the gross section at the age of 28d shall be adopted according to Table 3.0.2. Design value of compressive strength of concrete small block masonry (Mpa) Small block strength
Strength grade
Mortar strength
Note: ①For masonry with staggered holes, the value in the table shall be multiplied by 0.8. M2.5
Mortar strength
②For masonry with independent columns or double-row small blocks of thickness, the value in the table shall be multiplied by 0.7. ③For T-section masonry, the value in the table shall be multiplied by 0.85. For masonry filled with concrete not less than c15, the value in the table can be multiplied by the coefficient. @=［0.8/（1一门≤1.5, 8 is the hollow ratio of small blocks. For the volume of some holes filled with concrete, it can be converted according to the above formula by area ratio. 3.0.3
For double-row or multi-row lightweight aggregate concrete small blocks with a hollow ratio not exceeding 35%, the design value of masonry compressive strength shall be adopted in accordance with the following provisions: Engineering Construction Standard Full Text Information System
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1It can be adopted by multiplying the value in Table 3.0.2 by 1.1. 3.0.3.1
For lightweight aggregate concrete blocks with a hollow ratio not less than C15 For masonry filled with concrete, the coefficient can be multiplied again;
For masonry with double-row holes in the thickness direction, the value in Table 3.0.2 should be multiplied by 0.9.
3.0.4 The design value of bending tensile strength and shear strength of concrete small block masonry calculated based on the rough section at the age of 28d can be adopted according to Table 3.0.4. Design value of bending tensile strength and shear strength of small block masonry (MPa)
Strength category
Bending tensile
Failure characteristics
Along the tooth gap section| |tt||Cross-section along the seam
Cross-section along the seam or stepped sectionwww.bzxz.net
Note: For double-row hole or multi-row hole lightweight aggregate concrete small block masonry with a hollow ratio not exceeding 35%, the value in the table can be multiplied by 1.1.
5 The strength design value of the masonry in the following cases shall be multiplied by the adjustment coefficient Y respectively; 3.0.5
3.0.5.1 For multi-storey houses with a beam span of not less than 7.5m, the value in Table 3.0.2 shall be 0.9;
3.0.5.2 When cement mortar is used for masonry, the value in Table 3.0.2 shall be multiplied by 1.1. For the values in Table 3.0.4, Ya is 0.85; for the values in Table 3.0.4, Ya is 0.75; 3.0.5.3 When checking the components of the house under construction, it is taken as 1.10; 3.0.6 For new masonry where the mortar has not yet hardened, the design value of the masonry compressive strength can be determined based on the mortar strength being zero.
3.0.7 The elastic modulus, shear modulus, friction coefficient, and linear expansion coefficient of the masonry shall be implemented in accordance with the corresponding indicators of small concrete block masonry in the current national standard "Code for Design of Masonry Structures" GBJ3.
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W74. Design value of bending tensile strength and shear strength of small block masonry (MPa)
Strength category
Bending tensile
Failure characteristics
Along the tooth gap section
Along the through-seam section
Along the through-seam or stepped section
Note: For double-row hole or multi-row hole lightweight aggregate concrete small block masonry with a hollow ratio not exceeding 35%, the values in the table can be multiplied by 1.1.
5 The strength design value of masonry in the following cases shall be multiplied by the adjustment coefficient Y respectively; 3.0.5
3.0.5.1 For multi-storey houses with a beam span of not less than 7.5m, the value in Table 3.0.2 shall be 0.9;
3.0.5.2 When cement mortar is used for masonry, Ya is 0.85 for the value in Table 3.0.2; Ya is 0.75 for the value in Table 3.0.4; 3.0.5.3 When checking the components of a house under construction, it shall be taken as 1.10; 3.0.6 For new masonry where the mortar has not yet hardened, the design value of masonry compressive strength can be determined based on the mortar strength being zero.
3.0.7 The elastic modulus, shear modulus, friction coefficient and linear expansion coefficient of masonry shall be implemented in accordance with the corresponding indicators of small concrete masonry in the current national standard "Code for Design of Masonry Structures" GBJ3.
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W74. Design value of bending tensile strength and shear strength of small block masonry (MPa)
Strength category
Bending tensile
Failure characteristics
Along the tooth gap section
Along the through-seam section
Along the through-seam or stepped section
Note: For double-row hole or multi-row hole lightweight aggregate concrete small block masonry with a hollow ratio not exceeding 35%, the values in the table can be multiplied by 1.1.
5 The strength design value of masonry in the following cases shall be multiplied by the adjustment coefficient Y respectively; 3.0.5
3.0.5.1 For multi-storey houses with a beam span of not less than 7.5m, the value in Table 3.0.2 shall be 0.9;
3.0.5.2 When cement mortar is used for masonry, Ya is 0.85 for the value in Table 3.0.2; Ya is 0.75 for the value in Table 3.0.4; 3.0.5.3 When checking the components of a house under construction, it shall be taken as 1.10; 3.0.6 For new masonry where the mortar has not yet hardened, the design value of masonry compressive strength can be determined based on the mortar strength being zero.
3.0.7 The elastic modulus, shear modulus, friction coefficient and linear expansion coefficient of masonry shall be implemented in accordance with the corresponding indicators of small concrete masonry in the current national standard "Code for Design of Masonry Structures" GBJ3.
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