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针对汶川地震中大量桥台出现局部坍塌,产生永久滑移现象,提出了地震作用下桥台滑移计算方法。传统方法单一采用拟静力抗震稳定性安全系数,并不能准确评定桥台的动力稳定性,为此将桥台滑移地震动力响应分析与稳定系数分析方法相结合,通过采用毕肖普法计算桥台岸坡上潜在滑动面的稳定系数,对其中稳定系数小于1.25的瞬时超载滑移体,通过时间积分计算潜在滑动体的滑移量。最后结合算例,并通过计算探讨了滑移体各力学参数对桥台地震位移及地震性能的影响。
Aimed at the permanent collapse of a large number of abutments in the Wenchuan earthquake, the calculation method of the abutment slip under the earthquake action is proposed. The traditional method only adopts the safety factor of quasi-static seismic stability and can not accurately evaluate the dynamic stability of abutments. Therefore, by combining the dynamic response analysis of the abutment slip with the method of stability factor analysis, by using the Bishop method to calculate the abutment, The stability coefficient of the potential slip surface on the bank slope, for the transient overload slip body whose stability coefficient is less than 1.25, calculate the slip of the potential slip body by time integral. Finally, an example is given and the influence of various mechanical parameters of the slip body on the seismic displacement and seismic performance of the abutment is discussed.