断开式钢管约束RC柱压弯承载力计算

Research on Compression Bending Bearing Capacity of Steel Tubed RC Column

断开式钢管约束RC柱凭借优异的约束效果逐渐成为组合柱的研究热点之一,而采用传统压弯承载力计算方法计算结果偏差较大,基于有限元结合试验数据进行分析,结果表明钢管与核心RC混凝土变形不符合平截面假定,与传统计算方法假定相背。通过试验及模拟试件的变形分析,发现钢管与RC柱的控制截面侧移量相同,可作为新的变形协同条件计算控制截面压弯承载力。在此基础上推导计算公式并建立计算流程,对比试验数据与计算结果,表明该方法具有更好的适用性。

The steel tubed RC(STRC)column has become one of the research focuses of composite columns gradually due to its excellent confinement effect.However, the calculation results of the traditional calculation methods for the bearing capacity of compression and bending have a large deviation.Based on the finite element analysis combined with the test data, the results show that the deformation of the steel tube and the core RC concrete does not conform to the plane section assumption, which is contrary to the assumptions of the traditional calculation methods.Through the test and deformation analysis of the simulated specimen, it is found that the lateral displacement of the control section of the steel tube and the RC column is the same, which can be used as a new deformation coordination condition to calculate the compression bending bearing capacity of the control section.On this basis, the calculation formula is derived and the calculation process is established.The comparison between the test data and the calculation results shows that the method has better applicability.