Chen Zhiwei, Chen Bo
Department of Civil Engineering, Xiamen University, Xiamen, Fujian 361005, China.
Key Laboratory of Roadway Bridge and Structural Engineering, Wuhan University of Technology, Wuhan 430070, China.
ScientificWorldJournal. 2014;2014:763810. doi: 10.1155/2014/763810. Epub 2014 May 21.
Many long-span bridges have been built throughout the world in recent years but they are often subject to multiple types of dynamic loads, especially those located in wind-prone regions and carrying both trains and road vehicles. To ensure the safety and functionality of these bridges, dynamic responses of long-span bridges are often required for bridge assessment. Given that there are several limitations for the assessment based on field measurement of dynamic responses, a promising approach is based on numerical simulation technologies. This paper provides a detailed review of key issues involved in dynamic response analysis of long-span multiload bridges based on numerical simulation technologies, including dynamic interactions between running trains and bridge, between running road vehicles and bridge, and between wind and bridge, and in the wind-vehicle-bridge coupled system. Then a comprehensive review is conducted for engineering applications of newly developed numerical simulation technologies to safety assessment of long-span bridges, such as assessment of fatigue damage and assessment under extreme events. Finally, the existing problems and promising research efforts for the numerical simulation technologies and their applications to assessment of long-span multiload bridges are explored.
近年来，世界各地建造了许多大跨度桥梁，但它们常常受到多种类型的动态荷载作用，尤其是那些位于多风地区且同时承载火车和公路车辆的桥梁。为确保这些桥梁的安全性和功能性，桥梁评估通常需要了解大跨度桥梁的动态响应。鉴于基于动态响应现场测量的评估存在若干局限性，一种很有前景的方法是基于数值模拟技术。本文详细综述了基于数值模拟技术的大跨度多荷载桥梁动态响应分析中涉及的关键问题，包括行驶列车与桥梁之间、行驶公路车辆与桥梁之间、风与桥梁之间以及风 - 车 - 桥耦合系统中的动态相互作用。然后，对新开发的数值模拟技术在大跨度桥梁安全评估中的工程应用进行了全面综述，如疲劳损伤评估和极端事件下的评估。最后，探讨了数值模拟技术及其在大跨度多荷载桥梁评估应用中存在的问题和有前景的研究方向。
