论文部分内容阅读
研究对象为两层底部大底盘和主楼底部四层结构试验模型,加载点分别设置在底部大底盘的顶部和主楼底部四层结构的顶部,对其在低周反复荷载下的抗震性能进行试验研究,分析其承载力、位移、延性、刚度、退化过程、滞回特性、耗能以及破坏特征。研究表明:上部结构的承载力和下部结构的承载力相差较大;加载点高度为1 350 mm时,滞回曲线内凹,存在一定程度的捏拢现象,反映出模型存在一定的剪切变形和滑移;模型加载过程中,承载力下降均匀缓慢,具有良好的抗倒塌和变形能力,骨架曲线较为平滑,说明模型具有良好的弹塑性变形能力;加载点高度为800 mm时,结构刚度较大,滞回环正、负方向不对称,具有一定程度的捏拢,但捏拢程度较加载点在顶部时轻。
The research object is a four-story structure test model of two large bottom chassis and the bottom of the main building. The loading points are set on the top of the bottom large chassis and the top of the four-layer structure at the bottom of the main building, respectively. The seismic performance under repeated low- , Analyze its bearing capacity, displacement, ductility, stiffness, degradation process, hysteresis characteristics, energy consumption and damage characteristics. The results show that the bearing capacity of the superstructure is quite different from the bearing capacity of the substructure. When the height of the loading point is 1 350 mm, the hysteresis curve is concave with a certain degree of pinch-in phenomenon, which indicates that the model has some shear deformation And slippage. During the loading process, the bearing capacity decreases uniformly and slowly, and has good ability of resisting collapse and deformation. The skeleton curve is relatively smooth, which shows that the model has good elastic-plastic deformation ability. When the loading point height is 800 mm, Large, hysteresis loop is positive, the negative direction of asymmetry, with a certain degree of pinch, but the pinch level than the loading point at the top of the light.