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
