JGJ 95-1995 Technical Specification for Cold-rolled Ribbed Steel Bars Concrete Structures JGJ95-95 JGJ95-1995 Standard download decompression password: www.bzxz.net

Engineering Construction Standards Full-text Information System
Industry Standards of the People's Republic of China
Specification for Concrete Structures with Cold-Rolled Ribbed Steel wires and BarsJGI9595
Engineering Construction Standards Full-text Information System
.Engineering Construction Standards Full-text Information System
Industry Standards of the People's Republic of China
Specification for Concrete Structures with Cold-Rolled Ribbed Steel wires and Bars BarsJGL95-95
Editor: China Academy of Building ResearchApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: July 1, 1995
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the Release of the Industry Standard "Technical Specification for Concrete Structures with Cold-rolled Ribbed Steel Bars"
Construction Standard [1995] No. 57
Construction Committees (Construction Departments) of all provinces, autonomous regions, and municipalities directly under the Central Government, and Construction Committees of all independently planned cities: In accordance with the requirements of the Ministry of Construction's Document No. Jianbiao [19911718], the "Technical Specification for Concrete Structures with Cold-rolled Ribbed Steel Bars" edited by the China Academy of Building Research has been reviewed and approved as an industry standard, numbered JGJ95-95, and will be implemented from July 1, 1995. The China Academy of Building Research, the Ministry of Construction's building engineering standards and technical management unit, is responsible for the unified management and specific interpretation of this specification. This specification is published by the Standard and Norms Research Institute of the Ministry of Construction. Ministry of Construction of the People's Republic of China
February 23, 1995
Engineering Construction Standards Full-text Information System
Engineering Construction Standards Full-text Information System
Symbols and codes
2.． Actions and effects
2.2 Material properties
2.． Geometric parameters
3 Materials
Concrete
General provisions of this design code
Prestressed concrete structural members
Design of structural members
Bearing capacity calculation of normal section
Bearing capacity calculation of inclined section
Crack resistance verification
AAAAAAA
Crack width verification
Construction stage verification
Structural provisions
Construction technology
++++++++*
660866000
Inspection and acceptance of steel bars
6.2 Processing of steel bars
6.3 Fabrication and installation of steel skeleton
6.4 Tensioning technology of prestressed steel bars
6.5 Inspection and acceptance of structural members
Appendix A Calculation of the anchorage area at the end of prestressed concrete members Engineering Construction Standard Full Text Information System
3
Engineering Construction Standard Full Text Information System
Appendix B Calculation of the cross-sectional area of ​​longitudinal tension reinforcement in rectangular cross-section flexural members.34 Appendix c
Maximum span-to-height ratio of reinforced concrete flexural members for which deflection verification is not required...
Appendix D
Appendix E
Technical performance indicators of cold-rolled ribbed steel bars
Explanation of terms used in this code
Additional notes
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 technology-based economic policy in the design and construction of cold-rolled ribbed steel bar concrete structures, to achieve advanced technology, economic rationality, safety and applicability, and to ensure quality.
1.0.2 This code applies to the design and construction of reinforced concrete structures reinforced by cold-rolled ribbed steel bars and prestressed concrete medium and small structural members for industrial and civil buildings and general structures.
For structural members directly subjected to dynamic loads, when cold-rolled ribbed steel bars are used as main force bars, their design parameters shall be determined through tests. 1.0.3 For the design and construction of reinforced concrete structures reinforced by cold-rolled ribbed steel bars and prestressed concrete structural members, in addition to the provisions of this code, the relevant current national standards shall also be followed.
Engineering Construction Standard Full-text Information System
.Engineering Construction Standard Full-text Information System
2 Symbols and Codes
2.1 Actions and Action Effects
When designing cold-rolled ribbed reinforced concrete structures, the symbols representing actions and action effects shall be adopted in accordance with the following provisions:
Design value of bending moment:
Design value of shear force;
The combined force of prestressed steel bars and non-prestressed steel bars when the normal prestress of concrete is zero;
Axial force value calculated according to the combination of short-term effects of loads: Bending moment value calculated according to the combination of short-term effects of loads; Axial force value calculated according to the combination of long-term effects of loads ; Bending moment value calculated according to the combination of long-term effects of loads; Normal stress of concrete caused by prestressing; Tensioning control stress of prestressed cold-rolled ribbed steel bars; Normal stress of concrete at the edge of crack resistance verification under the combination of short-term effects of loads
Normal stress of concrete at the edge of crack resistance verification under the combination of long-term effects of loads;
Stress of prestressed cold-rolled ribbed steel bars when the normal stress of concrete at the combined force point of prestressed steel bars is zero;
Effective prestress of prestressed cold-rolled ribbed steel bars; Short-term stiffness of flexural members under the combination of short-term effects of loads; Long-term stiffness of flexural members under the combination of short-term effects of loads and taking into account the influence of the combination of long-term effects of loads.
Engineering Construction Standard Full-text Information System
bzsosO.cOmEngineering Construction Standard Full-text Information System
2.2 Material Properties
2.2.1 When designing cold-rolled ribbed reinforced concrete structures, the symbols and codes representing material properties shall be adopted in accordance with the following provisions:
- concrete elastic modulus;
E. Elastic modulus of steel bars;
Design value of axial compressive strength of concrete,
Standard value of axial tensile strength of concrete; Design value of axial tensile strength of concrete; Design value of bending compressive strength of concrete:
Standard value of tensile strength of cold-rolled ribbed steel bars; Standard value of tensile strength of prestressed cold-rolled ribbed steel bars; Design value of tensile strength of cold-rolled ribbed steel bars; Design value of compressive strength of cold-rolled ribbed steel bars, design value of tensile strength of prestressed cold-rolled ribbed steel bars; Design value of compressive strength of prestressed cold-rolled ribbed steel bars; Indicates the elongation of steel when the measuring gauge length is 10 times the diameter, Indicates the elongation of steel bars when the measuring gauge length is 100mm; Indicates the concrete strength grade with a standard value of cube compressive strength of 20N/mm2.
2.3 Geometric parameters
2.3.1 In the design of cold-rolled ribbed reinforced concrete structures, the symbols representing geometric parameters shall be adopted according to the provisions of the card column:
The distance from the resultant force point of the longitudinal tension reinforcement to the near edge of the section, a
-The distance from the resultant force point of the longitudinal compression reinforcement to the near edge of the section;-The distance from the resultant force point of the longitudinal non-prestressed tension reinforcement to the near edge of the section; The distance from the resultant force point of the longitudinal non-prestressed compression reinforcement to the near edge of the cut surface The distance from the resultant force point of the prestressed cold-rolled ribbed reinforcement in the tension zone to the near edge of the section Engineering Construction Standard Full Text Information System
bzsosO, cm3
Engineering Construction Standard Full Text Information System
The distance from the resultant force point of the prestressed cold-rolled ribbed reinforcement in the compression zone to the near edge of the section,
-The width of the rectangular section, the web width of the T-shaped and I-shaped sections; - Flange width of the tension zone of T-shaped or I-shaped section; - Flange width of the compression zone of T-shaped or I-shaped section; Section height,
Effective height of section;
Flange height of the tension zone of T-shaped or I-shaped section; Flange height of the compression zone of T-shaped or I-shaped section: Calculation span;
Anchorage length of longitudinal tension reinforcement;
Prestress transfer length of prestressed cold-rolled ribbed steel bars; Height of concrete compression zone,
Member cross-sectional area;
Member converted cross-sectional area;
Cross-sectional area of ​​longitudinal non-prestressed reinforcement in tension zone; Cross-sectional area of ​​longitudinal non-prestressed reinforcement in compression zone; Cross-sectional area of ​​longitudinal prestressed cold-rolled ribbed steel bars in tension zone; Cross-sectional area of ​​longitudinal prestressed cold-rolled ribbed steel bars in compression zone; Converted elastic resistance moment of tension edge of section, converted section inertia moment.
2.4 Calculation coefficients and others
2.4.1 When designing cold-rolled ribbed reinforced concrete structures, the symbols representing calculation coefficients and other symbols should be used in accordance with the following provisions: wwW.bzxz.Net
plastic influence coefficient of concrete in tension zone;
concrete tensile stress limit coefficient under the combined action of short-term effects of loads - concrete tensile stress limit coefficient under the combined action of long-term effects of loads; Engineering Construction Standard Full-text Information System
.bzsoso.Com Engineering Construction Standard Full-text Information System
- reinforcement ratio of prestressed cold-rolled ribbed steel bars in single-bar bending members, Pp
&—ratio of the elastic modulus of steel bar to the elastic modulus of concrete; %——measured value of the anti-cracking test coefficient of the member, [y]——allowable value of the anti-cracking test coefficient of the member. Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Cold-rolled ribbed steel bars are made of ordinary low-carbon steel or low-alloy steel hot-rolled round wire rods as the base material, and after cold rolling or cold drawing, they are cold rolled into steel bars with three or two crescent-shaped transverse ribs on their surface.
3.1.2 Cold-rolled ribbed steel bars in reinforced concrete structures and prestressed concrete structures can be selected according to the following provisions:
3.1.2.1550 grade steel bars are suitable for use as main force bars, frame bars, stirrups and structural steel bars in reinforced concrete structural members. 3.12.2650 grade and 800 grade steel bars are suitable for use as main force bars in prestressed concrete structural members.
Note: 550 grade, 650 grade and 800 grade represent the grades of cold-rolled ribbed steel bars with standard tensile strength values ​​of 550N/mm2, 650N/mm2 and 800N/mm2, respectively. 3.1.3 The standard tensile strength values ​​fsk or f of cold-rolled ribbed steel bars and prestressed cold-rolled ribbed steel bars shall be adopted according to Table 3.1.3.
Standard tensile strength values ​​of cold-rolled ribbed steel bars and prestressed cold-rolled ribbed steel bars (N/mm*)
Rebar grade
550 grade
650 grade
800 grade
Rebar diameter (mm)
(4), 5, 6, 7, 8, 9, 10, 12
(4), 5, 6
Note: The diameters in brackets in the table should not be used as main bars. Table 3.1.3
fsk or fok
3.14 The design tensile strength f, or fy and the design compressive strength f, or f' of cold-rolled auxiliary steel bars and prestressed cold-rolled auxiliary steel bars shall be adopted according to Table 3.1.4. Engineering Construction Standard Full Text Information System
bzsosO.com Engineering Construction Standard Full Text Information System
Strength Design Value of Cold-rolled Ribbed Steel Bars and Prestressed Cold-rolled Ribbed Steel Bars (N/mm)
Rebar Grade
550 Grade
650 Grade
800 Grade
fy or fy
f'y or f'y
Note: ①After mechanical straightening, the tensile strength design value of the 550 grade cold-rolled ribbed steel bars supplied in coils should be reduced by 20N/mm2, but the compressive strength design value should not be greater than the corresponding tensile strength design value②In reinforced concrete structures, the tensile strength design value of steel bars for axial tension and small eccentric tension members should be taken as 310N/mm2.
Elastic modulus E of cold-rolled ribbed steel bars. Take 1.9X105N/mm. 3.2 Concrete
The concrete strength grade of reinforced concrete structure should not be lower than C20; the concrete strength grade of prestressed concrete structural members should not be lower than C25. Note:
The concrete strength grade of structural members in indoor high humidity or open air environment shall not be lower than C30. The strength standard value, strength design value and elastic modulus of concrete shall be adopted in accordance with the relevant provisions of the current national "Concrete Structure Design Code" GBJ 10. Engineering Construction Standard Full Text Information System
bzsoso,om
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.