钢梁埋入混凝土墙节点承压破坏的弯剪相关性研究(之二)

Study on shear-moment relationship of steel beam embedded in RC member connections

改进已有钢梁埋入混凝土墙节点的力学分析模型,考虑了嵌入I型钢梁上下翼缘间混凝土对钢梁上下翼缘的压应力作用,给出节点的混凝土构件承压破坏的弯剪相关曲线和公式,并进行试验验证,为超静定组合节点内力分析提供理论依据。通过ABAQUS有限元分析,提出最大有效埋入深度概念,给出了混凝土有效承压宽度的建议值,分析了上翼缘与下翼缘前受压区合力的比值kf、下翼缘与上翼缘后受压区合力的比值kb的变化趋势,并给出了kf、kb的建议值,为节点内力准确分析打下基础。

The existing mechanical model of the joints that steel beams embedded in concrete wails was improved, and the compressive stress was taken into account which acts on the upper and lower flange by the embedded concrete between the upper and lower flange of I-Section steel beam. The moment-shear relationship curve is put forward, which was verified by experiment, so internal force analysis of statically indeterminatejoints will be obtained. Through the finite element analysis of ABAQUS, the concept of maximum effective embedded depth is suggested, and valueofeffective bearing width of concrete is given. What＇s more, the change trend of kf （ the front compressive zone resultant forceratio of the upper flange and lower flange） and kb （ the back compressive zone resultant force ratio of the lower flange and upper flange）was analyzed, and the suggested values of kf ,kb are given, so the joint forces will be able to be analyzed accurately.