装配式钢筋混凝土柱-钢梁节点抗弯性能有限元分析
Finite element analysis on flexural behaviour of prefabricated reinforced concrete column-steel beam connections

为研究装配式钢筋混凝土柱-钢梁节点抗弯性能，通过有限元分析软件ABAQUS建立4个不同试验参数的装配式钢筋混凝土柱-钢梁节点有限元模型，分析预埋钢筋直径、T形件翼缘厚度和腹板角钢对节点受力性能的影响。研究结果表明：装配式钢筋混凝土柱-钢梁T形件连接节点破坏模态主要包括：预埋钢筋受拉破坏、T形件翼缘腹板交界处形成塑性铰线和节点域混凝土局部挤压破坏等。增加T形件翼缘厚度，节点初始刚度和极限抗弯承载力均相应增加；设置腹板角钢可延缓节点刚度退化，提高节点抗弯承载力；合理设计节点域预埋钢筋和T形件，能改善节点域破坏机制，使破坏主要集中在T形件位置，提高受损部件的可修复性和可更换性。
A finite element model was established to simulate the flexural behaviour of four T-stub connections with prefabricated reinforced concrete column and steel beam by using ABAQUS software. The effects of the embedded bar diameter, the thickness of T-stub flange and the addition of web angle on the mechanical performance of connections were studied. The results show that the failure modes of concrete column-steel beam connections involved the tensile damage of embedded bars, the formation of plastic hinge line at the toes of T-stub, and the local crushing damage of concrete. Moreover, the initial stiffness and flexural bearing capacity of the connections were significantly improved by increasing the thickness of T-stub flange, while the stiffness degradation of connections was decreased by the addition of web plate. The connection damage mechanism can be significantly modified by reasonable design of embedded bar and T-stub in order to make the failure of the T-stubs, which can improve the reproducibility and replaceability of damaged parts