【摘要】 高烈度地震区的中小跨径梁桥主要采用减隔震支座或阻尼器来降低结构的地震响应,常用的减隔震装置在室外环境中存在耐久性问题,与桥梁结构使用寿命相差较大,且不具备上部结构自复位特征。本文提出一种基于弹性多线性的预压限位装置和滑板橡胶支座组合的新型桥梁减隔震体系。通过限位装置试件的拟静力试验及有限元软件分析,研究了装置的力学性能及新型减隔震体系的抗震效果。结果显示该体系通过耗散地震能量能够有效地降低桥墩的地震内力和位移,并在震后实现桥梁上部结构自复位,是一种可行的中小跨径桥梁抗震新体系。更多还原

【Abstract】 Seismic isolation bearings and dampers are often utilized to reduce seismic responses of small and medium-span beam bridges in high-intensity seismic areas. Conventional seismic isolation devices have the problems with durability in the atmospheric environment with much lower service life than bridge structure, while superstructure cannot be self-centered after an intense earthquake. An innovative bridge seismic isolation system based on the combination of elastic multi-linear preload restrainer and rubber slide bearing is proposed. Through pseudo-static test on actuator and dynamic analysis with FEM software, constitutive relationship of the restrainer and seismic performance of the system are studied. The results show that the system effectively restrains the seismic internal forces and displacements of bridge piers by dissipating seismic energy, and manages to realize self-reset after an earthquake, which is considered as a viable and novel seismic system for small and medium-span bridges.更多还原