有凹陷H型钢在轴压作用下的极限强度研究

Research on ultimate strength of H-beam with dents under axial compression

为分析凹陷深度和凹陷长度对H型钢残余极限强度的影响,采用非线性有限元分析方法,利用圆柱撞击H型钢腹板模拟其弹塑性变形,得到有凹陷的H型钢,在凹陷位置不变的前提下,通过控制凹陷深度和凹陷长度的变化,分析H型钢在轴向压力作用下的残余极限强度变化规律。数值模拟结果显示:(1)随着最大凹陷深度的增大,H型钢的残余极限强度逐渐降低,特别是当最大凹陷深度接近H型钢腹板厚度时,H型钢的残余极限强度仅为无凹陷H型钢极限强度的三分之一;(2)随着最大凹陷长度的不断增加,H型钢的残余极限强度成反比例直线下降。凹陷的模拟方法和有限元计算结果为评估有凹陷H型钢的残余极限强度提供了一定的参考。

To analyze the influence of the depth and length of dents on the residual ultimate strength of H-beams,this study employs the nonlinear finite element analysis and makes a cylinder hit the web of an H-beam to simulate its elastoplastic deformation and obtain the H-beam with dents.Assuming that the position of the dent is constant,this paper analyzes the variation laws of residual ultimate strength of the H-beam under axial compression by controlling the depth and length of the dent.The results show that(1)the residual ultimate strength of the H-beam decreases with the increase in the maximum dent depth,and in particular,the residual ultimate strength of the H-beam is only one-third of that of the H-beam without dents when the maximum dent depth is close to the thickness of the Hbeam web.(2)The residual ultimate strength of the H-beam plummets in inverse proportion to the increase in the dent length.The simulation method of dents and the finite element calculation result provide a certain reference for evaluating the residual ultimate strength of H-beams with dents.