Seismic behaviour and earthquake resistant design of long period structures

摘要

The studies summarized in this paper focus on the effects of far-field ground motions on the response of long period structures such as long span bridges and tall buildings. In the studies two long span suspension bridges and two tall office buildings, with their fundamental period ranging from 5.9 to 17.5 seconds were subjected to a strong near field and a relatively weak far field ground motions and their response were studied. All structures were steel structures. The research indicated that the force and displacement response of these long period structures to far field, but weak ground motion were far greater than the response of the same structures to much stronger ground motion recorded close to the epicenter. The main parameter affecting the response was the long dominant period of vibration for far field motions being close to or longer than the fundamental period of vibration of the structures.