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地震作用下桥台永久变形大小是评价桥梁基础地震稳定性的一个重要指标。首先分析地震下桥台破坏特点,提出简化桥台滑坡破坏模式,在此基础上考虑土体强度衰减效应对桥台稳定性的影响,将桥台-土体地震动力响应分析与Newmark有限滑移计算方法相耦合,提出桥台滑移计算公式。然后将计算结果与R-E方法进行对比,结果表明:提出的计算模型能较好地反映桥台-土体的破坏特点,较充分地考虑地基土软化对桥台的稳定作用,以及在一定程度上考虑桥台-土体的地震动力响应特性;土体强度衰减对桥台-滑坡体的稳定性影响很大,在计算中不可忽视。
The magnitude of permanent deformation of bridge abutments under earthquake is an important index to evaluate the seismic stability of bridge foundation. Firstly, the failure characteristics of abutments under earthquake are analyzed, and the simplified failure mode of abutment landslides is proposed. On the basis of this, the influence of soil strength attenuation on abutment stability is considered. The analysis of the dynamic response of abutment-soil interaction with Newmark finite slip Calculation method is coupled, proposed slip abutment calculation formula. The results show that the proposed calculation model can well reflect the failure characteristics of abutments and soils, more fully consider the stabilizing effect of subgrade soil softening on abutments, and to a certain extent Considering the seismic response characteristics of abutment-soil body, the attenuation of soil strength has a great influence on the stability of abutment-landslide body and can not be neglected in the calculation.