A Basic Study on the Influence of an Understructure on the Seismic Response of a Spatial Structure

공간구조의 지진응답에 대한 연구 하부구조의 영향에 관한 기초적 연구

To study the influence of an lower part on the seismic response of a spatial structure as the upper part of a structure, as a first step, authors subsititude the upper part and the lower part of a structure to single degree of freedom systems indivisually, and set up structural models connected by them. It is clarified that the mass ratio and the period ratio of an upper part to a lower part are important parameteres to find the amplification or reduction of the sesimic response of an upper part by considering of a lower part.