Development of Substructured Hybrid Loading System and Ultimate State of Composite Structural Members

提出了一种子结构非弹性地震响应的在线计算机-驱动器混合方法。一个完整的结构体系分为分析子结构和实验子结构。仅对临界区域进行建模的实验子结构的恢复力是根据试件的当前变形状态直接测量的。其余部分作为分析子结构，使用目前可用的分析模型来描述其恢复力特性。利用该亚结构混合荷载体系，可以对具有适当边界条件的关键构件进行实际地震荷载试验。从而可以准确、可靠地预测整体结构的非弹性地震反应。为了扩大子结构混合方法的适用性，开发并实现了一种能够测试隔震器和柱在轴、剪力和弯曲组合荷载作用下的三自由度加载系统。最后，采用该加载系统对高阻尼橡胶隔震器、钢箱形截面和钢筋混凝土柱进行了试验。

A substructured on - line computer - actuator hybrid method for inelastic earthquake response of structures is presented. A complete structural system is divided into analytical substructures and experimental substructures. Restoring forces for the experimental substructures modeling only the critical regions are directly measured from a specimen loaded based on its current deformation state. The remaining portions are taken as analytical substructures in which presently available analytical models are used to describe their restoring-force characteristics. Using this substructured hybrid loading system, critical members with proper boundary conditions can be tested under realistic earthquake loads. Thus, inelastic earthquake response of the total structure can be accurately and reliably predicted. To extend the applicability of substructured hybrid method, a three degree-of -freedom loading system capable of testing seismic isolators and columns under combined axial, shear, and bending loads has been developed and implemented. Finally, high-damping rubber seismic isolators and steel box-section and RC colurrms were tested using this loading system.