1.0.1 This specification has been formulated for the purpose to implement the working policy of taking prevention as the primary measure in antiseismic work, lessen the damaged to the structures caused by earthquakes, avoid casualties to people and reduce economic loss.
1.0.2 Structures for which ansiseismic design has been made in accordance with this specification, shall normally not be damaged or can continue to be used without repair after being impacted by an earthquake with an intensity lower than the protection level in the area; they might be damaged when subject to an earthquake at the guarding intensity, but may continue to be used after ordinary repair or without repair; and they will not collapse or be seriously damaged to the extent of endangering life or leading to major economic losses when the area is subject to an earthquake at an intensity one degree higher than the guarding intensity.
1.0.3 This specification is applicable to the antiseismic design for structures in areas with a guarding intensity of 6 to 9 degrees.
For the antiseismic design of structures in areas with a guarding intensity of 10 degrees or industries with special requirements, special study shall be conducted and the relevant regulations shall be implemented.
1.0.4 The antiseismic guarding intensity can be the basic seismic intensity specified in the current “Map of seismic intensity zoning of China”; for areas or factories and mines for which antiseismic protection classification has been made, antiseismic design can be made on the basis of the guarding intensity or seismic dynamic parameters for antiseismic design as confirmed in the antiseismic protection classification.
1.0.5 Structures shall be classified into the following four categories by their importance:
Class A ---- structures of special importance or with special requirements, and extremely serious consequences will be resulted if damaged in an earthquake;
Class B ---- important structures, which, if damaged in an earthquake, may lead to serious consequences such as massive casualty, serious secondary disaster, long term shutdown of important factories and mines;
Class C ----- structures other than those in Classes A, B and D;
Class D ---- secondary structures which are unlikely to cause personnel injury or death or sizable economic loss when damaged by an earthquake.
1.0.6 The antiseismic design for structures of all classes shall meet the following requirements:
1.0.6.1 The seismic action of Class A structures shall be calculated according to the specifically studied seismic dynamic parameters for antiseismic design; the seismic action of other classes of structures shall be calculated according to the guarding intensity in the area, and it is not necessary to perform calculation on seismic action for those with a guarding intensity of degree 6, unless otherwise specified in this specification.
1.0.6.2 For structures of Class A, special antiseismic measures shall be adopted; for structures of Class B, antiseismic measures can be adopted at one degree higher than the guarding intensity, provided that it should be made higher as appropriate for a guarding intensity of degree 9; for structures of Class C, antiseismic measures can be taken according to the guarding intensity; and for structures of Class D, antiseismic measures can be taken at one degree lower than the guarding intensity, but it should not be lowered when the guarding intensity is degree 6.
Note: (1) In this specification, “guarding intensity” is referred to as “intensity”; and intensity degree 6, degree 7, degree 8 and degree 9 is respectively referred to as “degree 6, degree 7, degree 8 and degree 9”.
(2) For the provision herein on taking antiseismic measures at one degree lower, it shall be made only once when there is a number of favorable factors.
1.0.7 This specification has been prepared in accordance with the current national standards “Unified standard on the reliability design of engineering structures” and “Basic terminologies and general signs for engineering structure design”.
1.0.8 The antiseismic design of structures shall also comply with the relevant national standards currently in force, in addition to implementing this specification.
Contents 1. General Provisions 2. Terminologies and Signs 2.1 Terminologies 2.2 Signs 3. Basic Requirements on Antiseismic design 3.1 Site Influence and Subgrade and Foundation 3.2 Antiseismic Structure System 3.3 Materials 3.4 Non Structural Members 4. Site, Subgrade and Foundation 4.1 Site 4.2 Natural Subgrade and Foundation 4.3 Liquefied Soil Subgrade 4.4 Seismic Depression on Soft Soil Subgrade 4.5 Pile Foundation 5. Seismic Action and Structure Antiseismic Proof-calculation 5.1 General Provisions 5.2 Horizontal Seismic Action and Action Effect Calculation 5.3 Calculation of Vertical Seismic Action 5.4 Section Antiseismic Proof-calculation 5.5 Antiseismic Deforming Proof-calculation 6. Frame and Bent Frame Structures 6.1 General Provisions 6.2 Antiseismic Calculation 6.3 Structural Measures 7. Suspension Boiler Frame 7.1 General Provisions 7.2 Antiseismic Calculation 7.3 Structural Provisions 8. Bins 8.1 General Provisions 8.2 Antiseismic Calculation 8.3 Structural Measures 9. Headframe 9.1 General Provisions 9.2 Antiseismic Calculation 9.3 Structural Measures 10. Reinforced Concrete Derricks 10.1 General Provisions 10.2 Antiseismic Calculation 10.3 Structural Measures 11. Braced Steel Derricks 11.1 General Provisions 11.2 Antiseismic Calculation 11.3 Structural Measures 12. Hyperbolic Cooling Tower 12.1 General Provisions 12.2 Body 12.3 Spray Devices 13. Television Tower 13.1 General Provisions 13.2 Antiseismic Calculation 13.3 Structural Measures 14. Tower Equipment Foundation in Petrochemical Plants 14.1 General Provisions 14.2 Antiseismic Calculation 14.3 Structural Measures 15. Coke Oven Foundation 15.1 General Provisions 15.2 Antiseismic Calculation 15.3 Structural Measures 16. Conveyor Vestibule 16.1 General Provisions 16.2 Antiseismic Calculation 16.3 Structural Measures 17. Pipe Support 17.1 General Provisions 17.2 Antiseismic Calculation 17.3 Structural Measures 18. Concentration Pool 18.1 General Provisions 18.2 Antiseismic Calculation 18.3 Structural Measures 19. Atmospheric Pressure Vertical Cylindrical Storage Tanks 19.1 General Provisions 19.2 Antiseismic Calculation 20. Spherical Storage Tanks 21. Horizontal Cylindrical Storage Tank 22. Blast Furnace System Structure 22.1 General Provisions 22.2 Blast Furnace 22.3 Hot Blast Stove 22.4 Dust Filters and Stripping Towers 22.5 Skew Bridges 23. Tailing Dam 23.1 General Provisions 23.2 Antiseismic Calculation 23.3 Structural and Engineering Measures Appendix A Conditions for Frame and Bent Structures to Be Calculated as Planes and Adjusting Coefficient of Seismic Action Effect Appendix B Sectional Antiseismic Proof-calculation for Core Zone of Frame Joints Appendix C Lateral Displacement Rigidity of Supporting Structures with Cross Beams for Column-Supported Square Bins Appendix D Displacement of Coke Oven Body Under Unit Horizontal Action Appendix E Rigidity of Frame Type Fixing Supports Appendix F Antiseismic Grade of Tailing Dams Appendix G Notes on Some Expressions Used in This Specification Additional Notes
