不同洞口位置节能砌块隐形密框复合墙体恢复力模型研究

为研究洞口位置对节能砌块隐形密框复合墙体滞回特性的影响，对6个采用低周反复加载方式的1/2缩尺试件的试验现象及数据进行分析。基于试验结果和现有恢复力模型理论，对试验数据进行拟合分析，利用退化四折线模型和回归方法，建立节能砌块隐形密框复合墙体的四折线恢复力模型。试验结果表明:当洞口位于墙体中间时，试件滞回环愈加丰满，试件初始刚度有所增加，承载力衰减速率减小，卸载刚度退化速率变慢。通过对骨架曲线特征参数的计算，并和试验骨架曲线对比，两者吻合较好，表明该恢复力模型可以较好的反映出不同洞口位置对其滞回特性的影响，可为节能砌块隐形密框复合墙体的弹塑性分析及工程应用提供参考。

Research on restoring force model of energy-saving block & invisible multi-ribbed frame composite walls with different hole position

In order to study the influence of the location of the hole on hysteresis characteristics of the energy-saving block & invisible multi-ribbed wall，the experimental phenomena and data of six 1/2 scale specimens with low cycle reversed loading were analyzed. Based on the test results and the existing restoring force model theory，the experimental data are fitted and analyzed，and the four fold line restoring force model of energy-saving block & invisible multi-ribbed frame composite walls is established by using the degenerated four fold line model and regression method. The test results show that when the location of the hole is in the middle of the wall，the hysteresis loop of the specimen becomes plumper，the initial stiffness of the specimen increases，the decay rate of the bearing capacity decreases，and the degradation rate of the unloading stiffness slows down. By calculating the characteristic parameters of the skeleton curve and comparing it with the test skeleton curve，the two are in good agreement，which shows that the restoring force model can better reflect the influence of different hole positions on its hysteresis characteristics，and it can provide references for the elastic-plastic analysis and engineering application of the energy-saving block&invisible multi-ribbed wall.