【摘要】 利用有限元分析软件分析了在集中荷载、均布荷载和地震作用下简支直线箱梁的剪力滞效应.保持简支直线箱梁的长度、弹性模量、泊松比、密度等参数不变,仅通过改变作用其上的荷载类型,探讨了不同荷载作用下直线箱梁的剪力滞效应;重点分析了简支直线箱梁的跨中横截面顶板上不同荷载作用下的应力分布及剪力滞系数变化规律.结果表明在3种不同荷载的作用下,简支直线箱梁跨中截面顶板的剪力滞系数均在顶板与腹板交接处最大;集中荷载和均布荷载大小的改变对直线箱梁剪力滞效应的影响可以忽略不计;地震作用下直线箱梁的剪力滞效应较为明显.更多还原

【Abstract】 We analyzed the shear lag effect of simply-supported straight box girder under the concentrated load,the uniform live load and the earthquake action using the finite element analysis software.Keeping the same parameters of simply-supported straight box girder such as length,elastic modulus,Poisson ratio,density and so on,only changing the types of loads,we analyzed the distribution of section stress and the variation of shear lag coefficient in the roof of the mid-span of simply-supported straight box girder under different loads.The results show that shear lag coefficient of roof and web junction of simply-supported straight box girder in the roof of the mid-span is maximum under the three different loads; the effect of changing the concentrated load and the uniform live load on the shear lag of straight box girder can be neglected; the shear lag effect of straight box girder under the earthquake action is more obvious.更多还原