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 thernresponse of long period structures such as long span bridges and tall buildings. In the studies two long spanrnsuspension bridges and two tall office buildings, with their fundamental period ranging from 5.9 to 17.5 secondsrnwere subjected to a strong near field and a relatively weak far field ground motions and their response werernstudied. All structures were steel structures. The research indicated that the force and displacement responsernof these long period structures to far field, but weak ground motion were far greater than the response of thernsame structures to much stronger ground motion recorded close to the epicenter. The main parameter affectingrnthe response was the long dominant period of vibration for far field motions being close to or longer than thernfundamental period of vibration of the structures.