Seismic Analysis on Girder Falling Damage and Unseating Prevention Design

摘要

Girder falling is a serious seismic damage of bridge, which causes traffic disruption directly. In this paper unseating-prevention philosophy of beam bridges are proposed by analyzing the process and causes of girder falling according to structural characters of bridges and investigation on girder falling. The design load of unseating-prevention device was theoretically deduced based on sudden loading principle of dynamics. and puts forward calculation method of the maximum slip length and supporting width of cap beam and unseating-prevention device to prevent damage of fallen girder.