双向水平地震动作用对某钢筋混凝土连续梁桥易损性的影响

以双向水平地震动作为输入，对钢筋混凝土连续箱梁高架桥开展非线性动力时程分析。建立基于双向水平地震动强度参数的桥梁结构易损性曲面，比较单向及双向水平地震动输入下桥梁结构易损性差异，分析双向水平地震动输入下横桥向地震动强度对桥梁整体易损性的影响规律。研究结果表明，双向水平地震动输入下的桥梁结构易损性明显高于单向地震动输入的情况，且随着横桥向输入地震动强度的增加，结构各破坏状态的超越概率明显增大。

Influence of Bi-directional Horizontal Ground Motion on the Vulnerability of a Reinforced Concrete Continuous Beam Bridge

The nonlinear dynamic time history analysis of reinforced concrete continuous box girder bridge is carried out with bidirectional horizontal ground motion as input. The vulnerability surface of bridge structure is established based on bidirectional horizontal ground motion intensity parameters. The difference of vulnerability of bridge structure under unidirectional and bidirectional horizontal ground motion input is compared, and the influence law of transverse seismic intensity on overall vulnerability of bridge under bidirectional horizontal ground motion input is analyzed. The results show that: the vulnerability of bridge structure under bidirectional horizontal ground motion input is significantly higher than that under unidirectional ground motion input, and with the increase of transverse ground motion input intensity, the exceeding probability of each failure state of the structure also increases significantly.