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采用大型通用有限元软件ABAQUS对圆钢管混凝土柱-预应力混凝土梁节点受剪性能分析得出的荷载-位移曲线、受剪承载力等与试验结果吻合较好,并深入探究节点受力过程中混凝土梁的裂缝发展机理,节点核心区内钢筋、环板、牛腿、抗剪环的应力分布情况,得出预应力在节点受力过程中对试件受剪性能的影响。在此基础上对试件进行了不同预应力的参数分析。结果表明:预应力提高了节点的开裂荷载,屈服荷载也有少许提高,节点的受剪承载力也得到了提高。
The load-displacement curve, shear strength and so on obtained by the analysis of shear properties of the concrete-filled circular steel tubular columns with prestressed concrete beams are in good agreement with the experimental results by the large-scale general finite element software ABAQUS. The crack propagation mechanism of concrete beam, the stress distribution of rebar, ring plate, cow leg and shear ring in the core of the node, and the influence of the prestress on the shear performance of the specimen during the stress of the node is obtained. On this basis, the parameters of different prestressed specimens were analyzed. The results show that the prestressing increases the cracking load of the joint, the yield load increases a little, and the shear strength of the joint has also been improved.