开孔方管柱与工字钢梁连接的试验研究及有限元模拟分析

Experimental Analysis on FEM of Connections Between Rectangular Hollow Steel Column and H-type Beam

针对工程中应用广泛的方管柱与工字型钢梁的端板连接,对1组不同构造的节点进行了静力试验研究及有限元模拟分析,试验结果不仅得到了连接点的M-θr关系曲线,而且也得到了方管柱开孔周围的应力分布,为分析此类连接点的力学特性提供了理论依据.试验结果同时表明:端板厚度的增加及外伸端板的连接螺栓至上下翼缘板距离的增加均会提高连接的初始刚度.此外,在对试验结果与有限元模拟分析进行比较的基础上,还得到了与试验结果相对应的M-θr拟合曲线,且结果表明利用幂函数模型拟合节点的M-θr曲线是可行的,而且在相当大的转角范围内与试验结果相当吻合,拟合结果为实际应用提供了可供参考的数学表达式.

Based on the connections between rectangular hollow steel columns with opening and H-type beams used in engineering,experimental analysis on FEM of a set of the connections is put forward in this paper.The results of experimental study for M-θr curves and distribution of stress around the opening of the column are obtained together,which can be used as the basis for evaluating the mechanical properties of the connections of interest.The experimental results show that enlarging thickness of the endplate and the distance between flange and the bolts out of flange of the beam will increase the initial stiffness of the connections.The fitting curves of M-θr in the experimental results are obtained through analysis of the results based on FEM and experimental results.The feasibility of modeling the M-θr curve of the connections with the power function is validated,which is well in agreement with the experimental results,thus can be used as mathematical basis for the real-world connections.