薄壁悬臂箱梁的剪力滞问题研究

Study on shear lag problem of thin wall cantilever box girder

采用最小势能原理对薄壁悬臂箱梁的剪力滞问题进行分析,推导了翼板上翼板的正应力理论解。采用有限元软件ABAQUS对理论解进行验算,发现计算结果吻合良好。薄壁悬臂箱梁的宽跨比B/L和腹板高度与翼缘板宽度之比h/B是影响剪力滞效应的两个主要因素,随着宽跨比的增大和高宽比的减小,剪力滞效应越明显。

This paper performs an analytical study on the shear problem of thin-walled cantilever girder by using the principal of minimum potential energy method,and the theoretical solution of normal stress in the top flange plate can be deduced. A relatively good comparison result of analytical calculation and ABAQUS simulation has been achieved in a specific example. The width span ratio of thin-walled girder(B/L) and the ratio of height of web and the width of flange plate(h/B) are two main factors influencing the shear lag effect. With the increase of B/L and decrease of h/B,the shear lag effect is more obvious.