1 General provisions
1.0.1 This code is formulated in order to satisfy the needs of structural design of buildings and special structures in petrochemical industry and meet the requirements of safety, applicability, economy and rationality.
1.0.2 This code is applicable to the structural design of buildings and special structures in petrochemical industry. It is not applicable to the structural design of public and civil buildings for office and residence.
1.0.3 This code is formulated according to the principles stipulated in the current national standards GB 50153 Unified standard for reliability design of engineering structures and GB 50009 Load code for the design of building structures.
1.0.4 The actions involved in the structural design of buildings and special structures in petrochemical industry shall include direct actions (loads) and indirect actions (such as those caused by foundation deformation, member deformation, temperature changes of equipment and pipelines, earthquake or explosion). This code only specifies the actions caused by load and temperature changes and explosion.
1.0.5 In addition to this code, the loads and actions involved in the structural design of buildings and special structures in petrochemical industry shall also comply with those specified in the current relevant standards of the nation.
2 Terms and symbols
2.1 Terms
2.1.1
permanent load
load whose value does not change with time, or whose change is negligible compared with the average, or whose change is monotonous and can tend to the limit during the service life of a structure. Loads exist in various working conditions in buildings and special structures in petrochemical industry
2.1.2
variable load
load whose value changes with time and whose change cannot be ignored compared with the average during the service life of a structure
2.1.3
accidental load
load that does not necessarily occur in the design and service life of a structure, but once occurred, its magnitude is very large and its duration is very short
2.1.4
operating load/working load
variable load of equipment under normal operating conditions, such as the medium weight of equipment and pipeline, the temperature action of equipment and the vibration load of equipment and pipeline, during the normal use of the structure
2.1.5
maintenance load
variable load of equipment under shutdown maintenance conditions, such as the core pulling load and overhaul crane load, during the normal use of the structure
2.1.6
testing load
variable load of equipment under water filling and pressure test conditions, such as the water weight during water filling and pressure test, the liquid weight during hydraulic test and the effect of air pressure on the structure during air pressure test, during the normal use of the structure
2.1.7
representative value of a load
load value used to check the limit state in design, such as nominal value, combination value, frequent value and quasi-permanent value
2.1.8
design reference period
time parameter selected to determine the representative value of variable load
2.1.9
nominal value
basic representative value of a load, which is the characteristic value of the statistical distribution of the maximum load in the design reference period (such as average, mode, median or tantile)
2.1.10
combination value
value of variable load making the exceeding probability of the combined load effect in the design reference period be consistent with the corresponding probability when the load appears alone, or making the combined structure have uniformly specified reliable index
2.1.11
frequent value
value of variable load of which the total exceeding time is the specified smaller ratio or the exceeding frequency is the specified frequency within the design reference period
2.1.12
quasi-permanent value
value of variable load of which the total exceeding time is about half of the design reference period within the design reference period
2.1.13
design value of load
product of the representative value of a load and the partial coefficient for load
2.1.14
load effect
reaction of structure or structural member caused by load, such as internal force, deformation and crack
2.1.15
load combination
provisions for the design values of various loads appearing at the same time when designing according to the limit state, which are made to ensure the reliability of the structure
2.1.16
fundamental combination
combination of permanent action and variable action when calculating the ultimate limit state
2.1.17
accidental combination
combination of permanent action, variable action and accidental action when calculating the ultimate limit state
2.1.18
characteristic/nominal combination
combination adopting the nominal value or combination value as the representative value of a load when calculating the limit state of normal use
2.1.19
frequent combinations
combination adopting the frequent value or quasi-permanent value as the representative value of load for variable loads when calculating the limit state of normal use
2.1.20
quasi-permanent combinations
combination adopting the quasi-permanent value as the representative value of load for variable loads when calculating the limit state of normal use
2.1.21
dynamic load
external action that changes with time; under its action, the inertial force produced by the structure cannot be neglected compared with the static force
1 General provisions
2 Terms and symbols
2.1 Terms
2.2 Symbols
3 Classification and representative values of loads
4 Permanent loads
5 Variable loads
5.1 General requirements
5.2 Dust load
5.3 Dynamic load
5.4 Equivalent load of air cooler fans and motors
5.5 Core pulling load of cold exchange equipment
5.6 Thermal action
6 Loads on buildings
6.1 General requirements
6.2 Uniform live loads on floors
6.3 Live loads on roofs
7 Loads on special structures
7.1 General requirements
7.2 Uniform live loads on platforms
7.3 Catalyst vibration load
7.4 Wind loads
8 Combination of loads
8.1 General requirements
8.2 Combination of loads
Annex A Dynamic coefficient of common power equipment
Annex B Overall calculation of wind load on framework
Annex C Most unfavorable effect combination of frame structure of coke column
Explanation of wording in this code
List of quoted standards
