In this paper, a stochastic dynamic analysis method for cable-stayed bridges subjected to multi-dimensional and multi-supported earthquake and waves is established based on the pseudo-excitation method. The Monte Carlo method is used to analyze the influence of excitation nonlinearity on the bridge structure response, and the applicability of this method is verified. Stochastic response characteristic of coastal cable-stayed bridges subjected to multi-dimensional and multi-supported earthquake and waves is studied. The influence of water–structure interaction on the stochastic seismic response of main components of the cable-stayed bridge is described, and the influence of key parameters is analyzed. The results show that the influence of excitation nonlinearity on the response of the cable-stayed bridge can be neglected. A greater energy input caused by the rigid additional mass of the hydrodynamic pressure is the reason for the increasing of the seismic response. The influence of stochastic response of the underwater structure of the tower is changed with the site conditions. For the ground motion acceleration input energy being distributed in the high-frequency domain, the water–structure interaction has a greater effect on stochastic seismic response of the underwater structure of the tower. The influence of water–structure interaction on the stochastic seismic response of the underwater structure of the cable-stayed bridge increases with the increasing of the wave height and water depth.

中文翻译：

---

多维多支撑地震波作用下沿海斜拉桥随机响应

本文基于拟激励法建立了斜拉桥多维、多支撑地震和波浪作用下的随机动力分析方法。采用蒙特卡罗方法分析了激励非线性对桥梁结构响应的影响，验证了该方法的适用性。研究了海岸斜拉桥在多维、多支撑地震和波浪作用下的随机响应特性。描述了水-结构相互作用对斜拉桥主要构件随机地震响应的影响，分析了关键参数的影响。结果表明，激励非线性对斜拉桥响应的影响可以忽略不计。水动力压力的刚性附加质量引起的较大能量输入是地震响应增加的原因。塔的水下结构随机响应的影响随着场地条件的变化而变化。由于地震动加速度输入能量分布在高频域，水-结构相互作用对塔筒水下结构的随机地震响应影响较大。水-结构相互作用对斜拉桥水下结构随机地震响应的影响随着波高和水深的增加而增加。塔的水下结构随机响应的影响随着场地条件的变化而变化。由于地震动加速度输入能量分布在高频域，水-结构相互作用对塔筒水下结构的随机地震响应影响较大。水-结构相互作用对斜拉桥水下结构随机地震响应的影响随着波高和水深的增加而增加。塔的水下结构随机响应的影响随着场地条件的变化而变化。由于地震动加速度输入能量分布在高频域，水-结构相互作用对塔筒水下结构的随机地震响应影响较大。水-结构相互作用对斜拉桥水下结构随机地震响应的影响随着波高和水深的增加而增加。