1. General
1.0.1 The specification is applicable in petrochemical enterprises for the design of steel frame structures to sustain coolers, heat exchangers , horizontal vessels and that with air coolers on its top.
The specification is not applicable for the design of steel frame with air coolers on the top of pipeline lane.
1.0.2 During the implement of the specification, other compulsory specifications at present should also be complied with.
2. Main Symbols
2.0.1 Action and effects of action
Fdk -standard value of horizontal equivalent loading on blower fan and motor of air coolers;
FEK - standard value of general horizontal earthquake action on frame;
FEK1, FEK2 - standard general horizontal earthquake action on frame at fundamental and secondary mode of vibration;
FVK - standard value of vertical equivalent loading of each blower fan and motor;
F1i, F2i - standard value of horizontal earthquake action at mass particle i on frame under fundamental and secondary mode of vibration respectively;
Geq -equivalent general gravity loading corresponding to fundamental natural vibration periods of frame;
M -design value of bending moment;
N -design value of reaction at support of beam; design value of axial force;
Nh -design value of horizontal force caused by bending moment on support;
P -design value of designed pretension force of each high-strength bolt;
PK -standard value of wind load on each layer’s nodal point of frame;
Q -design value of horizontal force on column footing;
R -design value of bearing capacity of structure member; reaction at flange of T-connection ;
S -design value of load effect combination of frame structure member under normal operation; area moment;
SEh -design value of load effect combination of frame structure member under the action of earthquake;
SEK - effect standard value of horizontal earthquake action;
SWer -design value of load effect combination of frame structure member under water filling testing;
WK - standard value of wind load on frame;
σC -design value of axially compression stress at the top surface of column footing.
