Study On Earthquake Response Analysis And Seismic Control Of Switch Building-Electrical Installations System

With the rapid development of the national economy,the demand of power energy increased largely.As an important part of the power system,switch building played a key role to ensure safe operation of power system.Many examples of devastating earthquake at home and abroad indicated that a strong earthquake on switch building would lead to the destruction of the entire power system.Furthermore;it should leading to serious secondary disasters and heavy economic losses to the national economy,and people's economic construction and greatly affected.In recent years,countries around the world have strengthened earthquake research of power system,but limited in switch building seismic research and many needs to be sorted out.In this paper,it's the first time to study earthquake response of switch building system from different perspectives.Considering the interaction of main structure and electrical installations,the dynamic characteristic of switch building was analyciZed,the earthquake response under the conditions of one dimension earthquake wave input, multiply dimensions wave input and near-fault ground motion input was studied. Furthermore,the seismic control of switch building was studied by using isolation technology.According to the results,some proposals were put forward to Code for Seismic design of buildings and Code for design of seismic of electrical installations. The main conclusions are shown as foliowing.Based on two main type switch buildings recommended by power system,the three-dimensional calculation models considering interaction of main structure-electrical installations were set up.The dynamic characteristics of models were calculated under different conditions such as main structure type and electrical installations setting type.It was discovered dynamic characteristics rules by the ratio of installations quality and floor quality.10 earthquakes waves representing ClassⅠ～ClassⅣsite were selected to research the switch buildings system elasticity response and elastoplasticity response under small earthquake condition and strong earthquake condition.According to some response value such as shear force at the end of column,horizontal displacement and accelerate at the top of column,and accelerate of electrical installations,the suggestion values of story drift angle limitation and dynamic magnification factor of electrical installations under multi-dimensions earthquake input were supplied.It was the first time to study switch building seismic performance under the condition of near-fault ground motion.The 100 near-fault ground motion records in Chichi earthquake(Taiwan) and Northridge earthquake(American) were selected to analysis the response of switch building.The results showed that destructive caused by near-fault ground motion records was dramatically than that of normal area records.In order to ensure normal work of switch building,the isolation technology as seismic control method was used to analysis earthquake response of main structure and electrical installations in switch building.The results showed that the earthquake response reduced greatly.The research results can be referenced by similar lifeline system.