抄録
The purpose of this study is to establish a rational aseismic design method, through the experimental and analytical research, applicable to the large turbine building of a thermal power plant, which accomodates many important equipment like steam turbines, generators and incorporates aseismic elements composed of k-type braced frame. Since the turbine building has large void spaces and openings in floors for turbines, generators and etc., the floor cannot be treated as a rigid element, hence plane frames, under the effects of adjacent frames, behave with respective difference during earthquakes. And there is additional limitation on arrangement and number of bracings. Consequently it becomes very important in terms of seismic capacity beyond elastic range to take into account both three-dimensional effect and inelastic behavior including post-buckling phenomena of bracing during severe earthquakes. The method was developed for the dynamic response analysis of the whole structure, taking into account both three-dimensional effect and inelastic characteristics, in which plane braced frames were connected to each other by springs representing floor component. Using the dynamic analysis system originated, we carried out inelastic dynamic response analysis under severe earthquakes, and confirmed high seismic capacity of the turbine buildings.
