浅谈地震作用下基于可靠度的桥台设计

Brief Talk on Bridge Abutment Design Based on Reliability under the Effect of Earthquake

主要是针对在重力式桥梁桥台设计的条件下遭受地震荷载时的可靠性研究。平面破坏面一直与地震主动土压力计算平衡法结合使用,对桥台在地震状态中保持稳定时的地震荷载进行分析,可靠性分析是用来估计在三种失效模式下的失效概率,针对不同的元件和系统的可靠性指标获得对三种失稳模式维持稳定所需的基础的最佳比例。

The reliability investigation mainly focuses on the condition of gravity -type bridge abutment suffering earthquake load. Failure surface is always combined with the calculating balance methods of earthquake active earth pressure and analyze the earthquake load when the abutment keeps stable in an earthquake. Reliability analysis is used to estimate the failure probability under three kinds of failure modes. With the help of different elements and system reliability index, the basic optimal proportion which three kinds of instable modes need to keep stable can be obtained.