1 General Provisions
1.0.1 This code was formulated with a view to implementing the national technical and economic policies in the design of concrete structures, achieving safety, applicability and economy and guaranteeing quality.
1.0.2 This code is applicable to the design of reinforced concrete, prestressed concrete and plain concrete structures of buildings and general structures. However, it not applicable the design of lightweight aggregate concrete structures or structures using special concrete.
1.0.3 This code was formulated based on the principle of the current national standards "Unified Standard for Reliability Design of Engineering Structures" (GB 50153) and "Unified Standard Reliability Design of Building Structures" (GB 50068). This code gives the basic requirements for the design of concrete structures.
1.0.4 In addition to this code, the design of concrete structures also shall comply with those specified in the relevant current standards of China.
Contents
1 General Provisions 1
2 Terms and Symbols 2
2.1 Terms 2
2.2 Symbols 3
3 General Requirements 6
3.1 General 6
3.2 Structural Scheme 7
3.3 Calculation of Ultimate Limit States 7
3.4 Checking of Serviceability Limit States 9
3.5 Durability Design 11
3.6 Principles for Design of Preventing Progressive Collapse 14
3.7 Principles for Design of Existing Structures 15
4 Materials 17
4.1 Concrete 17
4.2 Steel Reinforcement 19
5 Structural Analysis 24
5.1 General 24
5.2 Analysis Model 24
5.3 Elastic Analysis 26
5.4 Analysis on Plastic Redistribution of Internal Forces 27
5.5 Elastic-Plastic Analysis 27
5.6 Plastic Limit Analysis 28
5.7 Indirect Action Effect Analysis 28
6 Calculation of Ultimate Limit States 30
6.1 General 30
6.2 Calculation of Normal Section Load-bearing Capacity 30
6.3 Calculation of Inclined Section Load-bearing Capacity 48
6.4 Calculation of Load-bearing Capacity of Distortion Section 56
6.5 Calculation of Punching Shear Bearing Capacity 64
6.6 Calculation of Partial Compression Load-bearing Capacity 68
6.7 Checking of Fatigue 70
7 Checking of Serviceability Limit States 78
7.1 Checking of Cracks 78
7.2 Checking of Deflection of Flexural Members 86
8 Detailing Requirements 90
8.1 Expansion Joint 90
8.2 Concrete Cover 91
8.3 Anchorage of Steel Reinforcement 92
8.4 Splices of Steel Reinforcement 94
8.5 Minimum Ratio of Reinforcement for Longitudinal Stressed Steel Reinforcement 97
9 Fundamental Requirements for Structural Members 99
9.1 Slabs 99
9.2 Beams 103
9.3 Columns, Beam-column Joints and Brackets 110
9.4 Walls 119
9.5 Composite Members 121
9.6 Precast Concrete Structures 122
9.7 Embedded Parts and Connecting Pieces 124
10 Prestressed Concrete Structural Members 128
10.1 General 128
10.2 Calculation of Value for Loss of Prestress 137
10.3 Detailing of Prestressed Concrete Members 142
11 Seismic Design of Reinforced Concrete Structural Members 149
11.1 General 149
11.2 Materials 152
11.3 Frame Beams 153
11.4 Frame Columns and Frame-supported Columns 157
11.5 Column of Hinged Bent 165
11.6 Nodes of Frame Beam Column 167
11.7 Shear Walls and Connecting Beams 172
11.8 Prestressed Concrete Structural Members 182
11.9 Slab-column Joints 184
Appendix A Nominal Diameter, Nominal Sectional Area and Theoretical Weight of Steel Reinforcement 187
Appendix B Amplified Coefficient Method for Approximate Calculation of Sway Second-order Effect of Eccentric Compression Members 188
Appendix C Constitutive Relations for Steel Reinforcement and Concrete and the Multi-axial Strength Criterion for Concrete 190
Appendix D Design of Plain Concrete Structural Members 202
Appendix E Calculation for Load-bearing Capacity of Arbitrary Sections, Circular and Annular Normal Sections of Members 206
Appendix F Design Value of Equivalent Concentrated Reaction Used for Calculation of Slab-column Joints 211
Appendix G Deep Flexural Members 216
Appendix H Composite Beam and Slab Without Support 222
Appendix J Prestress Loss of Curved Post-tensioned Prestressing Tendons and/or Bars Due to Anchorage Deformation and Tendon Shrinkage 228
Appendix K Time-dependent Loss of Prestress 233
Explanation of Wording in This Code 236
List of Quoted Standards 237
