1 Scope
This code specifies the requirements for blast resistant design of petrochemical control rooms.
This code is applicable to the blast resistant design of newly constructed petrochemical control rooms. It may also be implemented as a reference for blast-resistant design of the renovated or expanded petrochemical control rooms.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this code. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this specification are encouraged to investigate the possibility of applying the most recent editions of the documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB 50007 Code for Design of Building Foundation
GB 50009 Code for the Design of Building Structure Load
GB 50010 Code for Design of Concrete Structures
GB 50011 Code for the Seismic Design of Buildings
GB 50019 Code for Design of Heating Ventilation and Air Conditioning
3 Terms and Main Symbols
For the purposes of this code, the following terms and definitions apply.
3.1 Terms
3.1.1
blast-resistant control room
a technically and economically reasonable control room that meets the needs of enterprise production and staff personal safety and resists blast waves from outside the building
3.1.2
blast-resistant door
a special door that resists the shock of blast wave from outside the building
3.1.3
blast-resistant access door
a blast resistant door required for personnel’s normal access to the building
3.1.4
blast-resistant equipment door
a blast resistant door required for large-scale equipment’s access to the building
3.1.5
blast-resistant window
special external window that resists the shock of blast wave from outside the building
3.1.6
safety glass
laminated glass or tempered glass of the required strength
3.1.7 air lock
a built-in chamber at personnel passages of the building designed for blocking out the harmful gas and maintaining positive air pressure indoor
3.1.8
blast-resistant valve
a special air valve equipped on the vents of blast resistant building that resists blast wave from outside the building
3.2 Main symbols
a——the acceleration of mass point motion;
A_s——the area of member reinforcement;
b——the width of member section;
C——specified limit where the structure or structural member reaches the normal use requirements;
C_e—— equivalent coefficient of load on side wall, back wall and roof;
C_d——resistance coefficient;
d——the effective height of member section;
D——the width of building in heading direction of blast wave;
DIF——the increase coefficient of dynamic load;
E_c——elastic modulus of concrete;
E_s——elastic modulus of rebar;
f_dc——designed dynamic strength of concrete;
f_du——the ultimate dynamic strength of rebar;
f_dy——the design dynamic strength of rebar;
F_t——the force acting on member (a function of time);
f_u——the ultimate strength of rebar;
f_yk——the standard strength of rebar;
f_ck^‘——the standard compressive strength of concrete;
f_y——the yield strength of rebar;
I——the inertia moment of member section;
I_cr——the inertia moment of the concrete cross-section when cracks are formed;
I_g——the inertia moment of concrete member on gross section of centroidal axis, regardless of the influence of rebars;
I_w——the positive pressure impulse;
K_L——the transfer coefficient of load or stiffness;
K_Lm——the transfer coefficient in considering load, stiffness and mass;
K_m——the transfer coefficient of mass;
k——member stiffness;
L——the length of structural member in heading direction of blast wave;
L_w——the wavelength of blast wave;
L_0——member span;
M_e——equivalent quality;
m——the member mass;
P——component impact load, the peak explosive load corresponding to the component under consideration;
P_a——the effective overpressure of blast wave acting on sidewall and roof;
P_atm——the standard atmospheric pressure of environment;
P_b——the effective overpressure of blast wave acting on backwall;
P_r——the peak reflected pressure;
P_s——stagnation pressure;
P_so——the peak incident overpressure of blast wave;
q_o——peak dynamic pressure;
R——the design resistance of structural member;
R_d——the structural member’s dynamic load, expressed in static load under pressure and within effective time of the blast wave;
S——the minimum distance from the stagnation pressure point to the edge of building;
S_GK——the load effect calculated according to the standard value G_K of permanent load;
S_QiK——the load effect calculated according to the standard value Q_iKof variable load;
S_BK——the blast load effect;
SIF——strength improvement factor;
T_N——the vibration period of mass point;
t_a——the time for blast wave to reach the backwall;
t_c——the lasting time of reflected pressure;
t_d——the action time of positive pressure;
t_e——the equivalent action time of positive pressure on front wall;
t_r——the rising time of blast wave effective overpressure on sidewall and roof;
t_rb——the rising time of blast wave effective pressure on backwall;
U——the wave velocity;
X_m——the elasticoplasticity deformation of structural member;
X_y——the ultimate elasticoplasticity deformation of structural member;
y——the displacement of mass point;
yG——partial coefficient of permanent load;
yQ——partial coefficient of variable load;
yB——partial coefficient of blast load.
ρ——the reinforcement ratio of non-prestressed tensile bar;
ρ′——the reinforcement ratio of non-prestressed compressive bar;
μ——the ductility ratio of structural member;
[μ]——the permissible ductility ratio of structural member;
θ——the elasticoplasticity angle of structural member;
[θ]——the permissible elasticoplasticity angle of structural member;
——the midspan deformation;
ψci——combination coefficient of variable load Q_i;
α——the energy absorption coefficient;
t——the lasting time coefficient;
