The bridges play an important transportation hub in the transportation lifeline system. The sea-crossing bridges located in earthquake-prone areas may be subjected to earthquake and wave action during their lifetime. This paper mainly investigates the seismic performance of continuous rigid frame bridges supported by group pile foundations based on the seismic fragility analysis. Based on the OpenSees software, the three-dimensional finite element model of the sea-crossing bridge is developed, where the pile-water interaction and pile-soil interaction are simulated by added mass method and p-y curve method, respectively. The uniform input ground motions are used by applying the displacement of the surface ground motion on all spring supports. Based on the traditional structural seismic vulnerability analysis and introducing the theory of reliability, the damage index is reduced by a half-trapezoidal distribution membership function, and the structural damage boundary is fuzzy analyzed to obtain the fuzzy components. Further, the damage limit about the vulnerability of the full bridge system is discussed. Finally, the influence of wave force on structural seismic vulnerability and the vulnerability of the full bridge model under different earthquake types, such as far-field, near-field pulse, and near-field non-pulse types, are analyzed.

桥梁在交通生命线系统中发挥着重要的交通枢纽作用。位于地震多发地区的跨海大桥在其使用寿命期间可能会受到地震和波浪作用。本文主要基于地震脆性分析研究群桩基础支撑的连续刚构桥的抗震性能。基于OpenSees软件，建立了跨海大桥三维有限元模型，采用加质量法和py法分别模拟桩-水相互作用和桩-土相互作用。曲线法，分别。通过在所有弹簧支架上应用地表地面运动的位移来使用均匀输入地面运动。在传统结构抗震易损性分析的基础上，引入可靠性理论，采用半梯形分布隶属函数降低损伤指数，对结构损伤边界进行模糊分析，得到模糊分量。进一步讨论了全桥系统脆弱性的损伤极限。最后，分析了远场、近场脉冲、近场非脉冲等不同地震类型下波浪力对结构地震易损性和全桥模型易损性的影响。