摘要
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 test model with two layers large podium at the bottom and four layers of the main structures was studied in this paper. The load points were set up at the top of the test model and the top of the large podium,respectively. The seismic performance of the model was carried out under low cyclic loading. The load-bearing capacity,displacement,ductility,stiffness,the degradation process,hysteresis characteristics,energy consumption,and the damage characteristics of the model were analyzed. The results showed that the difference of load-bearing capacity between upper structure and bottom structure was great. When the height of the load point is 1 350 mm,the hysteresis curve of the model was concave inward and pinched,which reflected the model having certain degree of shear deformation and sliding. The load-bearing capacity of the model decreased slowly and evenly and the model had good resistance to collapse and deformation capacity. The skeleton curve was relatively smooth and the model had good ability of elastic-plastic deformation. When the height of the load point was 800 mm,the structural stiffness was great. The hysteresis loops of positive and negative direction were asymmetry and had a certain degree of pinch. The pinch degree was lighter than that of the model with load point at the top of the model.
出处
《工业建筑》
CSCD
北大核心
2016年第9期71-75,共5页
Industrial Construction
基金
国家自然科学基金项目(51308011)
河南省教育厅人文社会科学研究项目(2016-gh-199)
关键词
大底盘结构
多层结构
抗震性能
试验研究
structure with large podium
multilayer structure
seismic performance
experimental research
