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在进行集中荷载作用下的钢梁设计时,若局部承压验算不满足要求,通常会考虑设置支承加劲肋。由于相关规范对设置支承加劲肋后的梁截面是否需要进行强度验算没有给出明确的要求,目前也没有相应的验算方法,故利用有限元软件ABAQUS,对有、无加劲肋钢梁分别进行弹性和弹塑性分析,结果表明:无加劲肋时采用弹性分析得到的局部压应力和折算应力与现行规范的计算值基本吻合;弹塑性分析结果较准确地反映局部压应力或折算应力超过设计强度后的有、无加劲肋钢梁的截面承载力。证明设置加劲肋后可以不验算局部压应力,提出设有支承加劲肋钢梁的强度验算方法。
During the design of steel beams under concentrated load, if the partial pressure checking does not meet the requirements, it is usually considered to set the supporting stiffeners. There is no corresponding checking method because there is no clear requirement for checking the strength of girder sections after the supporting stiffeners are set according to relevant norms. Therefore, finite element software ABAQUS is used to calculate the elastic properties of the girders with and without stiffeners respectively. And elastic-plastic analysis. The results show that the local compressive stress and translational stress obtained by elastic analysis without stiffeners are in good agreement with the calculated values of current codes. The results of elasto-plastic analysis more accurately reflect the local compressive stress or the converted stress exceeds the design strength There are, without stiffeners steel beam cross-section bearing capacity. It is proved that the local compressive stress can not be calculated after the stiffener is set up, and the method for checking the strength of the steel beam supporting the stiffener is proposed.