不同参数对盒式筒中筒结构剪力滞后效应的影响分析

Influence of different parameters on shear lag effect of box tube-in-tube structure

为研究空间钢网格盒式筒中筒结构的剪力滞后效应,利用SAP2000有限元软件建立不同几何尺寸的盒式筒中筒结构模型,并在水平地震作用下对其进行弹性分析。重新定义了剪力滞后效应系数,分析了连梁高度、高宽比、角柱刚度、窗裙梁刚度、钢网格式框架层间梁刚度对盒式筒中筒结构剪力效应的影响。结果表明:连梁高度、高宽比、角柱刚度、窗裙梁高度、层间梁的高度对结构剪力滞后效应影响较大,在结构设计时应该作为主要因素考虑;窗裙梁宽度、层间梁宽度对结构剪力滞后效应影响较小,在结构设计时应该作为次要因素考虑。

To study the shear lag effect of spatial steel grid box tube-in-tube structure, box tube models of different sizes were established by using the SAP2000 finite element software. Elastic analysis on the models under horizontal earthquake action was carried out. The shear lag effect coefficient was defined, and the effects of coupling beam height, height to width ratio, column stiffness,spandrel beam rigidity,stiffness of interlayer beam on the shear effect lag of the tube-in-tube structure were analyzed. The results show that coupling beam height, height to width ratio, column stiffness,spandrel beam height and interlayer beam height have great influence on the shear lag effect and should be considered as the main factors in structure design; that spandrel beam width and interlayer beam width have less influence on the shear lag effect and should be considered as the secondary factors in structure design.