大量震害现象和已有研究表明，限位挡块的设置能有效地减轻或避免梁体移位和落梁，是我国高速铁路桥梁最常用的抗震保护措施；但在强震作用下，支座破坏后的挡块碰撞力会使桥墩地震响应显著增大，且影响程度与挡块、桥墩参数密切相关，因此有必要建立高速铁路桥梁“挡块-支座-桥墩”一体化的协同抗震体系，开展协同优化研究。本项目旨在基于碰撞体构件变速率试验和非线性碰撞理论，提出准确反映碰撞时变行为的碰撞单元模型，实现高速铁路桥梁地震碰撞的精细化有限元模拟，揭示“挡块-支座-桥墩”抗震体系协同工作机理；通过理论分析和试验研究，提出基于行车安全和工程造价的高速铁路桥梁抗震协同优化策略，获得抗震体系的最优设计参数，以满足高速铁路桥梁安全运营、抗震可靠和造价经济等方面的多重需求。项目研究可为我国高烈度地区的高速铁路桥梁合理抗震设计提供理论依据，填补相关领域研究空白，有重要的学术和工程实际价值，社会经济效益显著。

A lot of earthquake disasters and the existing research indicate that the shear key is the commonly-used anti-seismic protection measure for high-speed railway bridges since it can mitigate or avoid the damages including horizontal movement and falling of the girders. However, the pounding forces of shear keys significantly make the increase of the seismic responses of the piers after the failure of the bearings under strong earthquake and the increasing value is closely related to the parameters of shear keys and piers. Therefore, it is very necessary to establish the collaborative anti-seismic system composed of shear keys, bearings, and piers of high-speed railway bridges and conduct the research on the collaborative optimization..The project focuses on two aspects. On the one hand, based on the velocity-changing test of the collision body and the non-linear collision theory, the collision element which can accurately perform the time-varying pounding behavior is proposed; then the refined FEM model simulating the collision under earthquake for high-speed railway bridges is carried out; lastly the collaborative working mechanism of the anti-seismic system composed of shear keys, bearings, and piers, is revealed. On the other hand, the collaborative anti-seismic optimizing strategy for high-speed railway bridges is proposed, considering service safety and engineering cost, by theoretical analysis and experimental investigation. Then the optimal design parameters of the anti-seismic system are obtained to meet the requirements with safe service, reliable anti-seismic capacity, and economical cost..The achievements of the project can provide strong theoretical support for reasonable anti-seismic design for high-speed railway bridges located in high intensity region in China. This research will fill the gap in the field, and bring significant academic value in engineering application, with remarkable social and economical benefits.