This study proposes a novel U-shaped 65Mn steel bumper as the displacement restraining device for base-isolated structures with laminated elastomeric rubber bearings. A series of bumpers with different geometric parameters were designed and tested under monotonic and cyclic quasi-static loading protocols. The experimental results from a total of 232 specimens were analyzed to develop an analytical model to calculate the backbone curve and the maximum elastic restoring force for U-shaped 65Mn bumpers. Thus, the analytical equations to calculate the elastic, hardening, and unloading stiffness of U-shaped 65Mn bumpers, as well as their maximum elastic restoring force, are validated by using an additional ten groups of bumpers with varying radiuses. These analytical equations can accurately predict the mechanical parameters of U-shaped 65Mn steel bumpers for a design purpose.

本研究提出了一种新型 U 形 65Mn 钢缓冲器作为带有层压弹性橡胶支座的基础隔震结构的位移限制装置。在单调和循环准静态加载协议下设计并测试了一系列具有不同几何参数的保险杠。对总共 232 个试样的实验结果进行了分析，以建立一个分析模型来计算 U 形 65Mn 保险杠的骨架曲线和最大弹性恢复力。因此，计算 U 形 65Mn 保险杠的弹性、硬化和卸载刚度及其最大弹性恢复力的解析方程通过使用额外的十组不同半径的保险杠进行验证。