Abstract

The in-service sea-crossing bridge handles a large number of vehicles, while considerable wind exists on the superstructure and wave exists on the substructure simultaneously, on a daily basis. Apart from the service loads, the bridges may also encounter extreme natural hazards such as earthquake, hurricane, etc., which might greatly threaten the structural safety. In particular, this article attempts to illuminate the influence of the simultaneous service and extreme loads on the dynamic performance of an in-service sea-crossing bridge along with traversing vehicles. To this end, a general earthquake-wind-wave-vehicle-bridge (EWWVB) simulation platform is established, which systematically integrates the interactions between earthquake, wind, wave, vehicle and bridge. The safety indicators are also implemented in the proposed platform to enable the driving safety evaluations of the vehicles travelling on the bridge during earthquakes. With the proposed simulation platform, an illustrative example is presented in which a number of road vehicles are travelling on an in-service prototype sea-crossing cable-stayed bridge during a sudden earthquake event. The results indicate that the extreme seismic load could become the dominant load affecting the dynamic response of the prototype sea-crossing bridge as well as the vehicles running on it.

摘要

在役的跨海大桥每天承载大量车辆，同时上层结构上存在相当大的风，下层结构上同时存在波浪。除了使用荷载外，桥梁还可能遭遇地震、飓风等极端自然灾害，对结构安全构成极大威胁。特别是，本文试图阐明同时服务和极端载荷对在役跨海大桥与穿越车辆动力性能的影响。为此，建立了一个通用的地震-风-浪-车-桥（EWWVB）仿真平台，系统地集成了地震、风、波浪、车辆和桥梁之间​​的相互作用。安全指标也在建议的平台中实施，以便在地震期间对在桥上行驶的车辆进行驾驶安全评估。使用所提出的仿真平台，展示了一个说明性示例，其中在突发地震事件期间，许多道路车辆在使用中的跨海斜拉桥原型上行驶。结果表明，极端地震荷载可能成为影响原型跨海大桥及其上行驶车辆动力响应的主要荷载。举一个说明性的例子，其中在突发地震事件期间，许多公路车辆在使用中的跨海斜拉桥原型车上行驶。结果表明，极端地震荷载可能成为影响原型跨海大桥及其上行驶车辆动力响应的主要荷载。举一个说明性的例子，其中在突发地震事件期间，许多公路车辆在使用中的跨海斜拉桥原型车上行驶。结果表明，极端地震荷载可能成为影响原型跨海大桥及其上行驶车辆动力响应的主要荷载。