JGJ/T 114-1997 Technical Specification for Welded Steel Mesh Concrete Structures JGJ/T114-1997 Standard download decompression password: www.bzxz.net

Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Technical Specification for Concrete StructuresReinforced with Welded Steel FabricJGJ/T114—97
1997Beijing
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 Concrete StructuresReinforced with Welded Steel FabricJGJ/T114—97
Editing Unit: China Academy of Building ResearchApproving Department: Ministry of Construction of the People's Republic of ChinaEffective Date: February 1, 1998
1997Beijing
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Notice on Issuing the Industry Standard "Technical Code for Concrete Structures with Welded Steel Mesh"
Construction Standard [1997] No. 187
Construction Committees (Construction Departments) of all provinces, autonomous regions, and municipalities directly under the Central Government, Construction Committees of independently planned cities, and relevant departments of the State Council:
In accordance with the requirements of the Ministry of Construction's Document No. Jianbiao [1995] 175, the "Technical Code for Concrete Structures with Welded Steel Mesh" edited by the China Academy of Building Research has been reviewed and approved as a recommended industry standard, numbered JGJ/T114—97, and will be implemented on February 1, 1998.
This code is managed and interpreted by the China Academy of Building Research, the Ministry of Construction's building engineering standards and technical management unit. This code is published by the Ministry of Construction's Standards and Norms Research Institute. Ministry of Construction of the People's Republic of China
July 31, 1997
Engineering Construction Standards Full-text Information System
W.bzsosO.cOEngineering Construction Standards Full-text Information System
2 Terms and Symbols
2.1 Terms·
2.2 Symbols
3 Materials
3.1 Welded Steel Mesh
3.2 Concrete
4 Design Calculation
General Provisions
4.2 Bearing Capacity Calculation of Normal Section
Bearing Capacity Calculation of Inclined Section
Crack Width Verification
Deflection Verification of Flexural Members
Construction Provisions
General Provisions
Construction·
Inspection and Acceptance of Welded Steel Mesh
Installation of Welded Steel Mesh
Appendix A
Appendix B
Models of standard steel welded mesh
Maximum span-to-height ratio of steel welded mesh concrete slab without deflection verification
Appendix C
Appearance quality requirements, geometric dimensions and allowable deviations of steel bar diameter of steel welded mesh
Technical performance requirements of steel welded mesh
Appendix D
Engineering Construction Standard Full-text Information System
W. Engineering Construction Standard Full-text Information System
Explanation of terms used in this code
Appendix E
Additional explanation...
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
1.0.1 This code is formulated to implement the national technical and economic policies and make the design and construction of steel welded mesh concrete structures technologically advanced, economically reasonable, safe and applicable, and ensure quality.
2This code applies to the design and construction of concrete structures such as plates and walls reinforced with welded steel mesh for industrial and civil buildings and general structures. 1.0.3For structural members that directly bear dynamic loads, when welded steel mesh is used as the main force-bearing reinforcement, its design parameters shall be determined through experiments. 1.0.4The design and construction of concrete structures reinforced with welded steel mesh shall comply with the provisions of the relevant current national standards in addition to complying with this code. Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
2Terms and Symbols
2.1Terms
2.1.1Welded Fabric
A steel mesh with longitudinal and transverse steel bars of the same or different diameters arranged vertically at a certain interval, and all intersections are welded together with resistance spot welding. 2.1.2 Cold-rolled ribbed steelwire Cold-rolled ribbed steelwire A steel bar that is made by cold-rolling a hot-rolled round wire rod and reducing its diameter to form three or two crescent-shaped transverse ribs on its surface.
2.1.3 Cold-drawn plain steelwire Cold-drawn plain steelwire A plain round steel wire that is made by cold-drawing a hot-rolled round wire rod and reducing its diameter. 2.1.4 Spacing of steelwire The distance between the center lines of adjacent steel bars in a welded mesh. For twin wires, the center line is the common tangent of the contact points of the two steel bars.
2.1.5 Twin wires
Two steel bars of the same type and diameter that are tightly together in a welded mesh. 2.1.6 Overhang
The length of the longitudinal and transverse steel bars that extend beyond the center lines of the transverse and longitudinal steel bars at the outermost edge of the welded mesh.
2.1.7 Lap of welded fabric In concrete structural members, when the length or width of the welded mesh is not enough, two meshes are overlapped or inserted into each other according to certain requirements to form a connection. 2.1.8 Normal overlapping A method of overlapping one mesh on another (Figure 2.1.8). 2.1.9 Nesting
-The steel bars of one mesh are inserted into another mesh so that the longitudinal and transverse steel bars of the two meshes are overlapped in the same plane (Figure 2.1.9). (b)
Flat-joining method
(a)Before overlapping (6)After overlapping
1-longitudinal reinforcement, 2-transverse reinforcement
2.1.10 Back overlapping
A method of overlapping a mesh by buckling it onto another mesh so that the transverse reinforcement is in one plane and the longitudinal reinforcement is in two different planes (Figure 2.1.10). 1
Figure 2.1.10 Back overlapping
1-longitudinal reinforcement; 2-transverse reinforcementWww.bzxZ.net
2.1.11 Lap length of welded fabricThe distance between the ends of the overlapping reinforcement of two welded fabrics (cold-rolled ribbed steel bar welded mesh) or the distance between the outermost transverse reinforcement of two overlapping meshes (cold-drawn smooth steel bar welded engineering construction standard full-text information system
W.bzsoso:cOn engineering construction standard full-text information system
net).
2.2.1 Action and effect of action
M——design value of bending moment;
M——bending moment value calculated by combination of short-term effects of loads;Mt——bending moment value calculated by combination of long-term effects of loads;0%——stress of longitudinal tensile reinforcement of reinforced concrete member calculated by combination of short-term effects of loads;
B,——short-term stiffness of bending member under combination of short-term effects of loads;Bt
long-term stiffness of bending member under combination of short-term effects of loads and considering the influence of combination of long-term effects of loads.
2 Material properties
Es—elastic modulus of reinforcement;
f——standard value of tensile strength of welded mesh reinforcement;f,—design value of tensile strength of welded mesh reinforcement;f',—design value of compressive strength of welded mesh reinforcement;fu
——standard value of axial tensile strength of concrete. 2.2.3 Geometric parameters
—— The distance from the resultant force point of the longitudinal tensile reinforcement to the near side of the section; as
a'. —— The distance from the resultant force point of the longitudinal compressive reinforcement to the near side of the section; 6 — The width of the rectangular section or the web width of the T-shaped section; —— The effective height of the section;
la —— The minimum anchorage length of the longitudinal tensile reinforcement; —— The height of the concrete compression zone,
A. —— The cross-sectional area of ​​the longitudinal reinforcement in the tension zone; A'. —— The cross-sectional area of ​​the longitudinal reinforcement in the compression zone. 2.2.4 Calculation coefficient
—— The height of the relative limit compression zone;
Engineering Construction Standard Full-text Information System
W.bzsosO.coI Engineering Construction Standard Full Text Information System
%——Ratio of elastic modulus of steel bar to elastic modulus of concrete; p longitudinal tensile reinforcement ratio,
——Surface characteristic coefficient of steel bar welded mesh. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
3 Materials
3.1 Steel bar welded mesh
3.1.1 Steel bar welded mesh should be made of LL550 grade cold-rolled ribbed steel bars, or LG510 grade cold-drawn smooth steel bars. A piece of welded mesh should be welded with the same type of steel bars.
3.1.2 Steel bar welded mesh can be divided into two types according to shape and specification: standard welded mesh and customized welded mesh.
3.1.2.1 The spacing and diameter of steel bars in the two directions of the standard welded mesh can be different, but the steel bars in the same direction should have the same diameter, spacing and length. The model of standard steel bar welded mesh shall comply with the provisions of Appendix A of this specification. 3.1.2.2 The shape and size of the customized welded mesh shall be determined by negotiation between the supplier and the buyer according to the design and construction requirements.
3.1.3 The specifications of the steel bar welded mesh shall comply with the following provisions: 3.1.3.1 The diameter of the steel bar shall be 4~12mm.
3.1.3.2 The length of the welded mesh shall not exceed 12m, and the width shall not exceed 3.4m. 3.1.3.3 The spacing of the steel bars in the production direction of the welded mesh shall be 100, 150, and 200mm, and the spacing of the steel bars perpendicular to the production direction shall be 100~400mm, and shall be an integral multiple of 10mm.
3.1.4 The steel bar welded mesh shall be used as the main force-bearing reinforcement, structural reinforcement of reinforced concrete structural components, and non-prestressed reinforcement in prestressed concrete structural components. 3.1.5 The strength standard value f of the welded mesh reinforcement shall be adopted according to Table 3.1.5. 3.1.6 The tensile strength design value f and compressive strength design value f' of welded mesh steel bars shall be adopted according to Table 3.1.6.
3.1.7 The elastic modulus E of welded mesh steel bars shall be adopted according to Table 3.1.7. Engineering Construction Standard Full-text Information System
W.bzsoso.coI Engineering Construction Standard Full-text Information System
Standard value of strength of welded mesh steel bars (N/mm2)
Welded mesh steel bars
Cold-rolled ribbed steel bars
Cold-drawn smooth steel bars
Steel bar diameter
4, 5, 6, 7, 8, 9, 10, 11, 124, 5, 6, 7, 8, 9, 10, 11, 12Table 3.1.5
Note: After consultation and agreement between the design unit and the manufacturer, according to the actual material conditions, the steel bar diameter within the range of 4~12mm can be upgraded by 0.5mm.
Design value of welded mesh reinforcement strength (N/mm)
Welded mesh reinforcement
Cold-rolled ribbed reinforcement
Cold-drawn smooth reinforcement
Elastic modulus of welded mesh reinforcement (N/mm)
Welded mesh
Cold-rolled ribbed reinforcement
Cold-drawn smooth reinforcement
3.2 Concrete
3.2.1 The concrete strength grade of reinforced welded mesh concrete structure should not be lower than C20. For structural members in high humidity indoors or in open air environments, the concrete strength grade should not be lower than C30.
2 The standard strength value, strength design value and elastic modulus of concrete shall be implemented in accordance with the relevant provisions of the current 3.2.2
National standard "Concrete Structure Design Code" GBJ10. Engineering Construction Standard Full Text Information System
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.