1 Scope
This Specification specifies the fundamental requirements for seismic action, structural seismic calculation and seismic measures of structures in petrochemical industry.
This Specification is applicable to seismic design for structures in petrochemical industry in areas with seismic precautionary intensity ranging from 6 to 9. It is not applicable to the pipes itself serving as stressed structures and other large cross-over pipe racks across the rivers.
Notes:
1 "Intensities 6, 7, 8 and 9" in this Specification is short for "seismic precautionary intensities of 6, 7, 8 and 9".
2 Structures in petrochemical industry include:
a) Frame-bent structure composed of reinforced concrete frame, frame-shear wall structure and bent;
b) Load-bearing steel frame, steel bent, steel frame-bent structure composed of steel frame support and steel bent;
c) Petrochemical tower-type equipment foundation and vertical tank foundation with total height above ground greater than or equal to 10m;
d) Frame type foundation of parallel and coaxial reactors and regenerators in catalytic cracking unit;
e) Foundations of atmospheric vertical steel cylindrical tanks;
f) Steel spherical tank foundations supported by steel frames;
g) Foundations of horizontal exchangers and horizontal tanks;
h) Foundations of tubular heater, converter and vertical heater;
i) Ethylene cracking heater frames and foundations;
j) Independent pipe racks, spanning pipe racks, longitudinal beam pipe racks and special pipe racks;
k) Exhaust stack and torch-tower frames;
l) Counterflow-type mechanical draught cooling towers and cross-flow mechanical draught cooling towers;
m) Ground, underground and semi-underground reinforced concrete pools;
n) Cast-in-place concrete silos which store bulk materials and are round or rectangular in plane shape and urea granulation-towers;
o) Independent chimneys, reinforced concrete chimneys and landing single-tube steel chimneys;
p) Reinforced concrete fire-dikes.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 5313 Steel plates with through-thickness characteristics
GB 18306 Seismic ground motion parameters zonation map of China
GB 50007 Code for design of building foundation
GB 50011 Code for seismic design of buildings
GB 50017 Code for design of steel structures
GB 50191 Design code for antiseismic of special structures
GB 50204 Code for acceptance of constructional quality of concrete structures
GB 50330 Technical code for building slope engineering
GB 50453 Standard for classification of seismic protection of buildings and special structures in petrochemical engineering
SH/T 3055 Specification for design of pipe racks in petrochemical industry
3 Terms and definitions
For the purposes of this specification, the following terms and definitions apply.
3.1
design basic acceleration of ground motion
design value of seismic acceleration with exceeding probability of 10% during the 50-year design reference period
3.2
seismic precautionary intensity
seismic intensity approved as the seismic precautionary basis of a region according to the authority prescribed by the state, generally the seismic intensity with exceeding probability of 10% during the 50 years is adopted
3.3
seismic precautionary criterion
scale for measuring the seismic precautionary requirements, which is determined by seismic precautionary intensity or design parameters of ground motion and seismic fortification categories of structures
3.4
seismic action
dynamic action of structure caused by ground motion, including horizontal seismic action and vertical seismic action
3.5
design parameters of ground motion
seismic acceleration (velocity and displacement) time history curve, acceleration response spectrum and peak acceleration for seismic design
3.6
design characteristic period of ground motion
periodic value corresponding to the start point of descending segment reflecting such factors as earthquake magnitude, epicentral distance and site category in the seismic influence coefficient curve used for seismic design
3.7
seismic influence coefficient
statistical average ratio of the maximum acceleration response to the gravity acceleration of single-mass-point elastic system under seismic action
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Fundamental requirements of seismic design
5.1 General requirements
5.2 Categories and criteria for seismic precaution
5.3 Seismic influences
5.4 Site and base foundation
5.5 Structural system and design requirements
5.6 Structural analysis
5.7 Seismic isolation and energy-dissipation design
5.8 Structural materials and construction
5.9 Anchor bolts
5.10 Non-structural components
6 Site, base and foundation
6.1 Site
6.2 Natural base and foundation
6.3 Liquefiable soil base
6.4 Seismic subsidence of soft cohesive soil base
6.5 Pile foundation
6.6 Slope seismic stability
7 Seismic action and seismic checking
7.1 General requirements
7.2 Horizontal seismic action and action effect calculation
7.3 Vertical seismic action calculation
7.4 Seismic checking of sections
7.5 Seismic deformation checking
8 Reinforced concrete frame-bent structure
8.1 General requirements
8.2 Seismic calculation
8.3 Details for frames
8.4 Details for bents
8.5 Details for frame-shear walls
9 Steel frame-bent structures
9.1 General requirements
9.2 Seismic calculation
9.3 Details of design
9.4 Details for steel frames and bents
10 Foundations of petrochemical tower-type equipment
10.1 General requirements
10.2 Seismic calculation
10.3 Details for equipment foundations
11 Frames supporting reactor and regenerator
11.1 General requirements
11.2 Seismic calculation
11.3 Detailing for frames
12 Foundations of atmospheric vertical cylindrical tanks
12.1 General requirements
12.2 Seismic calculation
12.3 Detailing for foundations
13 Foundations of spherical tanks
13.1 General requirements
13.2 Seismic calculation
13.3 Details for foundations
14 Foundations of exchanger and horizontal tanks
14.1 General requirements
14.2 Seismic calculation
14.3 Details for foundations
15 Foundations of tubular heaters
15.1 General requirements
15.2 Seismic calculation
15.3 Details for foundations
16 Structures and foundation supporting cracking heaters
16.1 General requirements
16.2 Seismic calculation
16.3 Details for structures and foundations
17 Pipe racks
17.1 General requirements
17.2 Seismic calculation
17.3 Details for pipe racks
18 Frames of exhaust stacks and torch-towers
18.1 General requirements
18.2 Seismic calculation
18.3 Details for exhaust stacks and frames of torch-towers
19 Cooling towers
19.1 General requirements
19.2 Seismic calculation
19.3 Details for cooling towers
20 Pools
20.1 General requirements
20.2 Seismic calculation
20.3 Details for reinforced concrete pools
21 Reinforced concrete silos and granulation-towers
21.1 General requirements
21.2 Seismic calculation
21.3 Details for reinforced concrete silos and granulation-towers
22 Chimneys
22.1 General requirements
22.2 Seismic calculation
22.3 Details for chimneys
23 Fire-dikes
23.1 General requirements
23.2 Seismic calculation
23.3 Details for dikes
Annex A (Normative) Conditions of frame-bent structure calculated as plane structure and modified coefficient of seismic action effect
Annex B (Normative) Seismic checking for section in the core zone of frame beam-column joints
Annex C (Informative) Simplified methods for seismic calculation of wind resisting column for gable wall
Annex D (Informative) Lateral displacement stiffness of props for column-supported reinforced concrete square silos with beams
Explanation of wording in this specification
