带楼板空间夹心节点抗震性能

Seismic Behavior of 3D Sandwich Joints with Slabs

梁柱节点是钢筋混凝土框架结构抗震的薄弱环节。为研究其抗震性能,通过MARC有限元软件对带楼板空间夹心节点进行数值模拟分析。研究了不同梁柱混凝土强度等级差、不同剪压比对夹心节点抗震性能的影响,通过对核心区采取加撑角钢的方式探究此种改进措施的可行性。结果表明:夹心节点梁柱强度差超过4个等级时,需采取相应的加强措施;在一定轴压比下,剪压比的增大对夹心节点的抗震是不利的;加撑角钢的约束对空间夹心节点的裂缝和变形有明显的抑制作用,抗震性能有明显的改善。

Beam-column joints are the weak part in terms of a seismic design of reinforced concrete frame structure. Through the finite element software marc numerical simulation analysis of 3D sandwich joints with slabs,parameters were selected to analyze the effects of different parameters on structural behavior of sandwich joint,such as beam-column concrete strength ratio,shear compression ratio. The feasibility of improvement measures by using the angle steel in core was explored. The results show that improvement measures need be taken when column and beam of concrete strength grade difference is greater than or equal to 4. The increase of shear compression ratio is unsafe under certain axial compression ratio;the angle steel in core has obvious inhibitory effect on the cracks and deformation of 3 D sandwich joints,seismic performance is improved.