强震作用下大跨度桥梁主引桥伸缩缝间碰撞效应研究

Under the strong earthquake excitation, the pounding between the main span and approach of long-span bridge usually led to local damage of the girder, failure of bearing, or even unseating of the bridge and the like, which significantly imperiled the safety of bridge itself, life and property. However, little research has been conducted on pounding mechanism and its countermeasures. And when it does not come to the design of anti-pounding structure, specification nor adequate experimental study is currently available. For this purpose, this project will first focus on the pounding causes between the main span and approach of long span bridge under earthquake excitation. Moreover, based on the pounding between different materials, the methods to determine the corresponding contact stiffness and coefficient of restitution will be proposed. Also presented is the basic principle of the same type of structural pounding. Finally, the merit and demerit, and the applicability of different anti-pounding and energy dissipated devices and displacement restrainers will be summarized. The research results are expected to greatly contribute to the development and completeness of collision analysis theory and anti-pounding design, and simultaneously provide basic theoretical foundation for the design of anti-pounding devices in the bridge engineering in future.

强震作用下大跨度桥梁主桥与引桥间碰撞通常会带来局部的梁体损伤、支座的破坏、甚至落梁等震害，这些震害会危及到桥梁及生命财产的安全。然而，目前对碰撞机理和防撞措施研究存在较多的不足，且设计防撞结构时，既没有规范可依，也鲜有试验反映其真实性能。为此，本项目首先分析地震作用下大跨度桥梁主引桥间碰撞的原因；其次，确定大跨桥梁不同材料间碰撞发生时，接触刚度及恢复系数取值方法，提出同类型结构碰撞分析的基本原则；最后，总结不同类型防撞耗能装置与限位装置的优缺点及适用性。研究成果将有助于发展和完善碰撞分析理论与防撞结构设计，也将为今后在实际桥梁工程中防撞装置设计提供理论基础。

强震作用下大跨度桥梁主桥与引桥间碰撞通常会带来局部的梁体损伤、支座的破坏、甚至落梁等震害，这些震害会危及到桥梁及生命财产的安全。目前对碰撞机理和防撞措施研究存在不足，设计防撞结构时，既没规范可依，也鲜有试验反映其真实性能。本项目分析了地震作用下大跨度桥梁主引桥间碰撞的原因及机理；确定了大跨桥梁不同材料间碰撞发生时，接触刚度及恢复系数取值方法，提出同类型结构碰撞分析的基本原则；总结了不同类型防撞耗能装置与限位装置的优缺点及适用性。研究成果有助于发展和完善碰撞分析理论与防撞结构设计，为今后在实际桥梁工程中防撞装置设计提供理论基础。