Detail of GB 50011-2010(2024)

Introduction of GB 50011-2010(2024)

GB 50011-2010(2024) Code for Seismic Design of Buildings (2024) Contents 1 General 12 2 Terms and Symbols 13 2.1 Terms 13 2.2 Symbols 14 3 Basic Requirements of Seismic Design 16 3.1 Category and Criterion for Seismic Precaution of Buildings 16 3.2 Earthquake Ground Motion 16 3.3 Site and Soil 16 3.4 Regularity of Building Configuration and Structural Assembly 17 3.5 Structural System 20 3.6 Structural Analysis 21 3.7 Nonstructural Components 22 3.8 Isolation and Energy-Dissipation 23 3.9 Materials and Construction 23 3.10 Seismic Performance-Based Design of Buildings 24 3.11 Seismic Response Observation System of Buildings 26 4 Site, Soil and Foundation 27 4.1 Site 27 4.2 Natural Soil and Foundation 30 4.3 Liquefied Soil and Soft Soil 31 4.4 Pile Foundation 36 5 Earthquake Action and Seismic Checking for Structures 37 5.1 General 38 5.2 Calculation of Horizontal Earthquake Action 42 5.3 Calculation of Vertical Earthquake Action 47 5.4 Seismic Checking for the Sections of Structural Member 48 5.5 Seismic Checking for the Storey Drift 50 6 Multi-storey and Tall Reinforced Concrete Buildings 54 6.1 General 54 6.2 Essentials in Calculation 60 6.3 Details of Seismic Design for Frame Structures 65 6.4 Details of Seismic Design for Seismic Wall Structures 71 6.5 Details of Seismic Design for Frame-seismic-Wall Structures 74 6.6 Requirements for Seismic Design of Slab-column-seismic-Wall Structures 75 6.7 Requirements for Seismic Design of Tube Structures 76 7 Multi-storey Masonry Buildings and Multi-storey Masonry Buildings with RC Frames on Ground Floors 79 7.1 General 79 7.2 Essentials in Calculation 84 7.3 Details of Seismic Design of Multi-storey Brick Buildings 89 7.4 Details of Seismic Design of Multi-storey Concrete Block Buildings 94 7.5 Details of Seismic Design of Multi-storey Masonry Buildings with RC Frames and Seismic-Walls on Ground Floors 97 8 Multi-Storey and Tall Steel Buildings 101 8.1 General 101 8.2 Essentials in Calculation 103 8.3 Details for Steel Frame Structures 109 8.4 Details for Steel Frame-concentrically-braced Structures 112 8.5 Details for Steel Frame-eccentrically-braced Structures 113 9 Single-storey Factory Buildings 116 9.1 Single-storey Factory Buildings with Reinforced Concrete Columns 116 9.2 Single-storey Steel Factory Buildings 126 9.3 Single-storey Factory Buildings with Brick Columns 132 10 Large-span Buildings 136 10.1 Single-storey Spacious Buildings 136 10.2 Large-span Roof Buildings 138 11 Earth, Wood and Stone Houses 143 11.1 General 143 11.2 Unfired Earth Houses 144 11.3 Wood Houses 145 11.4 Stone Houses 147 12 Seismically Isolated and Energy-Dissipated Buildings 149 12.1 General 149 12.2 Essentials in Design of Seismically Isolated Buildings 150 12.3 Essentials in Design of Seismic-energy-dissipated Buildings 155 13 Nonstructural Components 160 13.1 General 160 13.2 Basic Requirements for Calculation 160 13.3 Basic Seismic-Measures for Architectural Members 162 14 Subterranean Buildings 167 14.1 General 167 14.2 Essentials in Calculation 167 14.3 Seismic Details and Anti-liquefaction Measures 169 Appendix A The Seismic Precautionary Intensity, Design Basic Acceleration of Ground Motion and Design Earthquake Groups of Main Cities and Towns in China 171 Appendix B Requirements for Seismic Design of High Strength Concrete Structures 206 Appendix C Requirements for Seismic Design of Prestressed Concrete Structures 208 Appendix D Section Seismic Check for the Beam-column Joint Core Zone of Frames 210 Appendix E Requirements for Seismic Design of the Transfer Storey Structures 214 Appendix F Requirements for Seismic Design of Reinforced Concrete Small-sized Hollow Block Seismic -Wall Buildings 216 Appendix G Requirements for Seismic Design of Buildings with Steel Brace-Concrete Frame Structures and Steel Frame-Reinforced Concrete Core Tube Structures 224 Appendix H Requirements for Seismic Design of Multi-storey Factory Buildings 227 Appendix J Seismic Effect Adjustment for Transversal Planar-Bent of Single-Storey Factory 234 Appendix K Longitudinal Seismic Check for Single-Storey Factory 237 Appendix L Simplified Calculation for Seismically Isolated Design and Seismically Isolated Measures of Masonry Structures 243 Appendix M Reference Procedures of Performance-based Seismic Design 248 Explanation of Wording in This Code 255 List of Quoted Standards 256 1 General 1.0.1 This code is formulated with a view to implementing the relevant laws and regulations on construction engineering and protecting against and mitigating earthquake disasters, carrying out the policy of “prevention first”, as well as alleviating the seismic damage of buildings, avoiding casualties and reducing economic loss through seismic precautionary of buildings. The basic seismic precautionary objectives of buildings which designed and constructed in accordance with this code, are as follows: 1) under the frequent earthquake ground motion with an intensity being less than the local Seismic Precautionary Intensity, the buildings with major structure undamaged or requiring no repair may continue to serve; 2) under the earthquake ground motion with an intensity being equivalent to the local Seismic Precautionary Intensity, the buildings with possible damage may continue to serve with common repair; or 3) under the rare earthquake ground motion with an intensity being larger than the local Seismic Precautionary Intensity, the buildings shall not collapse or shall be free from such severe damage that may endanger human lives. If the buildings with special requirements in functions or other aspects are carried out with the seismic performance-based design, more concrete and higher seismic precautionary objectives shall be established. 1.0.2 All the buildings situated on zones of Seismic Precautionary Intensity 6 or above must be carried out with seismic design. 1.0.3 This code is applicable to the seismic design and the isolation and energy-dissipation design of the buildings suited on zones of Seismic Precautionary Intensity 6, 7, 8 and 9. And the seismic performance-based design of buildings may be implemented in accordance with the basic methods specified in this code. As for the buildings suited on zones where the Seismic Precautionary Intensity is above Intensity 9 and the industrial buildings for special purpose, their seismic design shall be carried out according to the relevant special provisions. Note: For the purposes of this code, “Seismic Precautionary Intensity 6, 7, 8 and 9” hereinafter is referred to “Intensity 6, 7, 8 and 9”. 1.0.4 The Seismic Precautionary Intensity must be determined in accordance with the documents (drawings) examined, approved and issued by the authorities appointed by the State. 1.0.5 Generally, the seismic precautionary intensity of buildings shall be adopted with the basic seismic intensity (the intensity values corresponding to the design basic acceleration of ground motion value in this code) determined according to the “Seismic Ground Motion Parameter Zonation Map of China”. 1.0.6 In addition to the requirements of this code, the seismic design of buildings also shall comply with the requirements specified in the relevant current standards of the State. 2 Terms and Symbols 2.1 Terms 2.1.1 Seismic precautionary intensity The seismic intensity approved by the authority appointed by the State, which is used as the basis for the seismic precaution of buildings in a certain region. Generally, it is taken as the seismic Intensity with a 10% probability of exceedance in 50 years. 2.1.2 Seismic precautionary criterion The rule for judging the seismic precautionary requirements, which is dependent on the Seismic Precautionary Intensity or the design parameters of ground motion and the precautionary category of buildings. 2.1.3 Seismic ground motion parameter zonation map The map in which the whole county is divided into regions with different seismic precautionary requirements according to the ground motion parameter (that is the degree of earthquake ground motion intensity indicated by acceleration). 2.1.4 Earthquake action The dynamic response of structure caused by earthquake ground motion, including horizontal and vertical earthquake action. 2.1.5 Design parameters of earthquake ground motion The parameters of earthquake ground motion used in seismic design, including the acceleration (velocity or displacement) time history of the earthquake ground motion , the acceleration response spectrum and the peak value of ground acceleration 2.1.6 Design basic acceleration of earthquake ground motion The design value of seismic acceleration with a 10% probability of exceedance in the 50-years design reference period. 2.1.7 Design characteristic period of earthquake ground motion The period value corresponding to the starting point of the descending section of the seismic influence coefficient curve used for seismic design, that is dependent on the earthquake magnitude, epicentral distance, site class and etc. For convenience, it is named as “characteristic period” for short. 2.1.8 Site Locations of the project colonies, being with similar characteristics of response spectra. The scope of site is equivalent to plant area, residential area and natural village or the plane area no less than 1.0km2. 2.1.9 Seismic concept design of buildings The process of making the general arrangement for the buildings and structures and of determining details, based on the fundamental design principles and concepts obtained from the past experiences in earthquake disasters and projects. 2.1.10 Seismic measures The seismic design contents except earthquake action calculation and member resistance calculation, including the details of seismic design. 2.1.11 Details of seismic design All the detailed requirements that must be taken for the structural and nonstructural components according to seismic concept design principles and require no calculation generally. 2.2 Symbols 2.2.1 Actions and effects FEk, FEvk—— Standard values of total horizontal and vertical earthquake actions of structure respectively; GE, Geq—— Representative value of gravity load of structure (or component) and the total equivalent representative value of gravity load of a structure ,respectively; wK—— Standard value of wind load; SE—— Seismic effect (bending moment, axial force, shear, stress and deformation); S—— Fundamental combination values of the effects of earthquake action and other loads; Sk—— Effect of the standard value of action or load; M—— Bending moment; N—— Axial force; V—— Shear; p—— Pressure on bottom of foundation; u—— Lateral displacement; θ—— Storey drift 2.2.2 Material properties and resistance K—— Stiffness of structure (member); R—— Resistant capacity of structural component; f, fk, fE—— Design value, standard value and seismic design value of various material strength (including the bearing capacity of soil) , respectively; [θ]—— Allowable storey drift. 2.2.3 Geometric parameters A—— Cross-sectional area of member; As—— Cross-sectional area of reinforcement; B—— Total width of structure; H—— Total height of structure, or the column height; L—— Total length of structure (unit); α—— Distance; as, a's—— Minimal distance from the force point of the longitudinal tensile and compressive reinforcements to the margin of section, respectively; b—— Sectional width of member; d—— Depth or thickness of soil layer, or the diameter of reinforcement; h—— Depth of cross-section of member; l—— Length or span of member; t—— Thickness of wall or floor slab. 2.2.4 Coefficients of calculation α—— Horizontal seismic influence coefficient; αmax—— Maximum value of horizontal seismic influence coefficient; αvmax—— Maximum value of vertical seismic influence coefficient; γG, γE, γW—— Partial factor of action; γRE—— seismic adjusting factor for load-bearing capacity; ζ—— Calculation coefficient; η—— Enhancement or adjustment coefficient of earthquake action effect (internal force or deformation); λ—— Slenderness ratio of member, or the proportionality coefficient; ξy—— Yield strength coefficient of structure (member); ρ—— Reinforcement ratio or ratio; ø—— Stability coefficient of compressive member; —— Combination value coefficient or the influence coefficient. 2.2.5 Others T—— Natural vibration period of structure; N—— Penetration resistance (in blow number); IlE—— Liquefaction index of soil under earthquake; Xji—— The coordinate of modal displacement (relative displacement of the ith mass point of the jth mode in x direction); Yji—— The coordinate of modal displacement (relative displacement of the ith mass point of the jth mode in y direction); n—— Total number, such as number of storeys, masses, reinforcements and spans, etc.; υse—— Equivalent shear wave velocity of soil layer; Φji—— The coordinate of modal rotation (relative rotation of the ith mass point of the jth mode around the z axial direction). 3 Basic Requirements of Seismic Design 3.1 Category and Criterion for Seismic Precaution of Buildings 3.1.1 The seismic precautionary category and the seismic precautionary criterion of buildings shall be determined in accordance with the current national standard GB 50223 “Standard for Classification of Seismic Protection of Building Constructions”. 3.1.2 Unless otherwise specified in this code, Categories B, C and D buildings with seismic precautionary intensity 6 may not be carried out the calculation of earthquake action. 3.2 Earthquake Ground Motion 3.2.1 The earthquake ground motion of the zones in which buildings are suited shall be represented by design basic acceleration and characteristic period of earthquake ground motion corresponding to the seismic precautionary intensity. 3.2.2 The corresponding relationship between the seismic precautionary intensity and the design basic acceleration of ground motion shall be in accordance with those specified in Table 3.2.2. Unless otherwise stated in this code, the buildings in such zones where the design basic acceleration of ground motion is 0.15g and 0.30g shall be carried out with seismic design respectively according to the requirements of seismic precautionary intensity 7 and 8. Table 3.2.2 Corresponding Relationship Between Seismic Precautionary Intensity and Design Basic Acceleration of Ground Motion Seismic precautionary intensity 6 7 8 9 Design basic acceleration value of ground motion 0.05g 0.10 (0.15)g 0.20 (0.30)g 0.40g Note: g is the gravity acceleration. 3.2.3 The characteristic period of earthquake ground motion shall be determined according to the design earthquake groups and the site class of the building site. The design earthquakes in this code are totally divided into three groups, and their characteristic periods shall be adopted according to the relevant provisions in Chapter 5 of this code. 3.2.4 The seismic precautionary intensity, design basic acceleration of ground motion and design earthquake groups of the central areas in the main cities in China may be adopted according to Appendix A of this code.

Contents of GB 50011-2010(2024)

1 General 2 Terms and Symbols 2.1 Terms 2.2 Symbols 3 Basic Requirements of Seismic Design 3.1 Category and Criterion for Seismic Precaution of Buildings 3.2 Earthquake Ground Motion 3.3 Site and Soil 3.4 Regularity of Building Configuration and Structural Assembly 3.5 Structural System 3.6 Structural Analysis 3.7 Nonstructural Components 3.8 Isolation and Energy-Dissipation 3.9 Materials and Construction 3.10 Seismic Performance-Based Design of Buildings 3.11 Seismic Response Observation System of Buildings 4 Site, Soil and Foundation 4.1 Site 4.2 Natural Soil and Foundation 4.3 Liquefied Soil and Soft Soil 4.4 Pile Foundation 5 Earthquake Action and Seismic Checking for Structures 5.1 General 5.2 Calculation of Horizontal Earthquake Action 5.3 Calculation of Vertical Earthquake Action 5.4 Seismic Checking for the Sections of Structural Member 5.5 Seismic Checking for the Storey Drift 6 Multi-storey and Tall Reinforced Concrete Buildings 6.1 General 6.2 Essentials in Calculation 6.3 Details of Seismic Design for Frame Structures 6.4 Details of Seismic Design for Seismic Wall Structures 6.5 Details of Seismic Design for Frame-seismic-Wall Structures 6.6 Requirements for Seismic Design of Slab-column-seismic-Wall Structures 6.7 Requirements for Seismic Design of Tube Structures 7 Multi-storey Masonry Buildings and Multi-storey Masonry Buildings with RC Frames on Ground Floors 7.1 General 7.2 Essentials in Calculation 7.3 Details of Seismic Design of Multi-storey Brick Buildings 7.4 Details of Seismic Design of Multi-storey Concrete Block Buildings 7.5 Details of Seismic Design of Multi-storey Masonry Buildings with RC Frames and Seismic-Walls on Ground Floors 8 Multi-Storey and Tall Steel Buildings 8.1 General 8.2 Essentials in Calculation 8.3 Details for Steel Frame Structures 8.4 Details for Steel Frame-concentrically-braced Structures 8.5 Details for Steel Frame-eccentrically-braced Structures 9 Single-storey Factory Buildings 9.1 Single-storey Factory Buildings with Reinforced Concrete Columns 9.2 Single-storey Steel Factory Buildings 9.3 Single-storey Factory Buildings with Brick Columns 10 Large-span Buildings 10.1 Single-storey Spacious Buildings 10.2 Large-span Roof Buildings 11 Earth, Wood and Stone Houses 11.1 General 11.2 Unfired Earth Houses 11.3 Wood Houses 11.4 Stone Houses 12 Seismically Isolated and Energy-Dissipated Buildings 12.1 General 12.2 Essentials in Design of Seismically Isolated Buildings 12.3 Essentials in Design of Seismic-energy-dissipated Buildings 13 Nonstructural Components 13.1 General 13.2 Basic Requirements for Calculation 13.3 Basic Seismic-Measures for Architectural Members 14 Subterranean Buildings 14.1 General 14.2 Essentials in Calculation 14.3 Seismic Details and Anti-liquefaction Measures Appendix A The Seismic Precautionary Intensity, Design Basic Acceleration of Ground Motion and Design Earthquake Groups of Main Cities and Towns in China Appendix B Requirements for Seismic Design of High Strength Concrete Structures Appendix C Requirements for Seismic Design of Prestressed Concrete Structures Appendix D Section Seismic Check for the Beam-column Joint Core Zone of Frames Appendix E Requirements for Seismic Design of the Transfer Storey Structures Appendix F Requirements for Seismic Design of Reinforced Concrete Small-sized Hollow Block Seismic -Wall Buildings Appendix G Requirements for Seismic Design of Buildings with Steel Brace-Concrete Frame Structures and Steel Frame-Reinforced Concrete Core Tube Structures Appendix H Requirements for Seismic Design of Multi-storey Factory Buildings Appendix J Seismic Effect Adjustment for Transversal Planar-Bent of Single-Storey Factory Appendix K Longitudinal Seismic Check for Single-Storey Factory Appendix L Simplified Calculation for Seismically Isolated Design and Seismically Isolated Measures of Masonry Structures Appendix M Reference Procedures of Performance-based Seismic Design Explanation of Wording in This Code List of Quoted Standards