江阴魔方时代广场复杂梁柱节点承载性能试验研究

为研究大悬挑钢管混凝土梁柱节点的受力性能,制定了足尺试验和FEM数值模拟相结合的验证性研究方案.针对悬挑梁柱节点汇交杆件多、荷载大、内力复杂、加载困难等特点,设计了15 m×10 m×10 m的大型自平衡反力架加载系统,采用试验手段和FEM数值分析技术相结合的方法对节点的受力性能进行了研究.从理论和试验上研究了加强环式梁柱节点的工作机理、工作性能和传力机制,并将试验结果与FEM数值结果进行比较,验证FEM数值模拟的正确性.试验结果表明,该节点在1.3倍设计荷载下是安全的,并且仍具有一定的承载潜力;大悬挑的存在,致上柱偏心受压,有较大的水平位移,应用时应加强上柱刚度;梁上翼缘与加强环间有较大的应力集中,施工中应保证焊接质量;内加强环对节点受力性能的影响较小.

Research on the mechanical performance of complicated beam-column joint In Jiangyin Magic Cube Time Square

In this research,the full-scale test is conducted to investigate the mechanical performance of the concrete-filled beam-column joint.Self-balanced loading frame with dimensions of 15 m×10 m×10 m is built due to the complexity of the joint and internal force,the greatness of load,and the difficulty of loading.Meanwhile,the finite element model is generated to inspect the performance of the beam-column joint under the test loads for verification.Through comparisons of test results with FEM results,properties and the load transfer mechanism of the ring-stiffened beam-column joint are analyzed.It is verified that the joint is reliable under 1.3 times of the design load.Due to the effect of large-cantilevered beams,the upper end of the CFT column is subjected to the eccentric compression.For this reason,the strength of the upper column should be enhanced in practice.The intersection of the CFT column and the ring stiffeners is subjected to high tensile stress,which can result in the failure in this region.According to FEM results,stress on the inner ring stiffeners is low.Therefore,inner stiffener exerts a limited impact on the mechanism of the joint.