型钢混凝土自复位双肢墙板的恢复力模型

Restoring force model for steel reinforced concrete self-centering coupled wall panels

为明确型钢混凝土(steel reinforced concrete,SRC)自复位双肢墙板的恢复力模型和参数确定方法,在低周往复加载试验的基础上,研究了双肢墙板在水平荷载作用下的破坏形态和工作机制。墙板的变形及破坏历程为:墙板摇摆和耗能器剪切屈服。墙板的破坏主要集中在耗能器上,具有良好的自复位能力。根据墙板的滞回特征,提出恢复力模型,包括骨架规则、卸载规则和反向加载规则三部分,并提出影响恢复力模型的10个参数。其中,3个刚度参数和3个强度参数确定骨架规则,4个位移参数确定卸载规则和反向加载规则。基于双肢墙板、预应力筋、耗能器和框架梁的协同工作机制,提出了影响恢复力模型的刚度参数、强度参数和位移参数的确定方法。与试验结果进行对比,试验滞回曲线与模拟得到的滞回曲线吻合较好,试验耗能和模拟耗能也基本一致。研究结果表明:本文提出的恢复力模型能较好地描述型钢混凝土双肢墙板的滞回特征,参数确定方法具有较好的分析精度。

In order to present a restoring force model and a determination method of the parameters for steel reinforced concrete self-centering coupled wall panels,the study investigated the failure modes and working mechanism of the coupled wall panels under lateral loads utilizing cyclic loading tests.The failure process of the wall panels included the rocking of wall panels and the shear yielding of the dampers.The failure of wall panels was localized in the dampers,which demonstrated excellent resiliency.On basis of hysteretic characteristics of the wall panels,the restoring force models were proposed,which consisted of skeleton rules,unloading rules and reloading rules.Ten parameters affecting restoring force model were then proposed.The skeleton rules were defined by three stiffness parameters and three strength parameters.The unloading rules and reloading rules were defined by four displacement parameters.Methods for the determination of stiffness parameters,strength parameters and displacement parameters affecting the restoring force model were proposed in light of the cooperative working mechanism among coupled wall panels,dampers,prestressed tendons and framed beams.The comparison between test results and simulation results shows that the test hysteresis curves are in good agreement with those of the numerical simulation,and the test energy dissipation is basically the same as that of the simulation.It is then concluded that the proposed restoring force models do well in describing the hysteretic features of the steel reinforced concrete coupled wall panels and that the methods for determining the parameters have satisfactory analytical accuracy.