薄壁钢箱梁考虑加劲肋构造剪力滞效应的计算

摘要

采用有限元方法对设置不同加劲肋的钢箱梁进行模拟计算,分析了各试件的应力分布并给出在不同构造情况下箱梁跨中截面顶板的剪力滞系数,表明在钢箱梁中加劲肋可以有效地减少剪力滞效应；根据有限元模拟计算出的不同构造情况下各试件的正应力值,并结合变分法公式提出了计算箱梁截面正应力的修正公式,有效地提高了计算精度.%By using the finite element method to calculate thin-walled box girders with types of arrangements of stiffening rib, analyzing the stress distribution of specimens with types of arrangements of stiffening rib to obtain the shear lag coefficient of roof in the middle section, research shows that shear lag effect on steel box girder would decrease with stiffening ribs. Based on the direct stress in specimens with types of arrangements of stiffening rib by the finite element analysis, referred to the formula of vari-ational method, the improving formula to calculate the direct stress in section of thin-walled box girder is obtained to raise the calculation accuracy.