考虑楼板作用的SRC柱-钢梁混合框架动力时程分析

为了解楼板空间作用对型钢混凝土(SRC)柱-钢梁混合框架抗震性能的影响,利用有限元软件ABAQUS分别建立带有楼板和不带楼板的两跨三层SRC柱-钢梁框架,选取2组天然波和1组人工波对其进行弹塑性分析,对比2种框架结构的型钢应力分布、混凝土板损伤、层间相对位移角以及框架基底剪力,分析楼板在结构抗震中的影响规律。结果表明:增加楼板可以有效增加框架抗侧刚度,最大可使层间位移角降低38.7%;同时可以减小核心区梁端塑性区域的面积,减缓型钢上翼缘应力发展速度;而且楼板的存在可使最大基底剪力提升60.7%,有利于减小结构损伤和提高抗震性能。

Dynamic time history analysis of steel reinforced concrete column-steel beam hybrid frame considering the effect of slab

To study the effect of slab on seismic behavior of steel reinforced concrete(SRC)columns-steel beam hybrid frame,this paper established the two-span and three-story SRC column-steel beam frame with and without slabs by ABAQUS.Three seismic waves were selected for elastoplastic dynamic time history analysis.The stress distribution of steel,damage of concrete slab,inter-story displacement angle and base shear of two kinds of frame structure are compared to analysis the influence of slab.The results show that the slab can effectively increase the lateral stiffness of the frame and reduce the inter-story displacement angle by 24.9%at most;the increase of the slab can reduce the area of the plastic area of the beam end in the core area,slow down the development speed of the stress on the top flange of the section steel,which is conducive to the earthquake resistance;the existence of the floor slab can increase the maximum base shear by 60.7%,which is conducive to reducing the structural damage and improving the seismic performance.