Application And Research Of Isolation Technology In Electric Power Building

At present, isolation technology is mainly used in dwelling houses and very fewer offices building inland while seldom used in lifeline construction such as electric power buildings. It has shown from so many earthquake destroy examples that aseismic reliability of electric power system must be strengthened and its research has become one of the important tasks. Especially, how to insure the common work of substation in different conditions are the emphases in aseismic research. This paper based on the real engineering-110kV Switch building in 330kV XiBeiJiao substation designs isolation layer for it. It is used 3-d FEM model and spring model in code as calculation model, laminated rubber bearing as isolation layer. The author using SAP2000 and NBA programs computes the nonlinear dynamical time history response and investigates the initial force change under temperature stress of the isolation building. Comparing the reaction between aseismic building and isolation building, the author receives some beneficial conclusions. The results showed that: (1) the models used by author and the analysis are useful and can be practiced. (2) After using isolation technology, the structure's period, earthquake response, base shear force and acceleration are all decreased markedly and the horizontal displacement focuses on isolation layer. (3) Under frequent earthquake action, the shear force ratio between layers is close to 0.35; in according with the provision in aseismic design code that the horizontal seismic reduction coefficient can choose 0.53 and the upper building can be designed by decreasing one degree. (4) Because of the displacement stiffness in longitudinal direction is larger than that in transverse direction; the result is that the isolation effect inlongitudinal direction superior than that in transverse direction. (5) The stiffness center of isolator layer should coincide with the mass center of the whole building so as to diminish earthquake torsion effect of the upper structure largely and realize the optimization design. (6) The remarkable period of floor movement avoids that of ground movement successfully, while the high frequency of floor response spectrum is filtrated and the resonance possibility between and upper construction is decreased. (7) It shouldn't only consider the regulation of electric equipments code, but think about the reducing of acceleration response spectrum and extension period to make rational design. (8) It can remarkably decrease the temperature stress caused by temperature change after using isolation technology.