剪力滞后对开口薄壁杆件侧向稳定的影响

提出一种简单而有足够精度的方法，以探讨开口薄壁杆件中由杆壁中面上的剪应变引起的剪力滞后现象对其侧向稳定的影响。首先建立一个考虑杆件扭转和翘曲，特别是考虑杆壁中面上剪应变的能量方程。这个方程可适用于任意横向荷载、任意边界条件下和任意棱形开口薄壁杆件的侧向稳定分析。利用Ｇａｌｅｒｋｉｎ加权余量法解一些典型的数值例题，并与已知的试验结果和有限单元法的计算结果吻合很好。最后详细讨论了反映剪力滞后现象的杆壁

Effect of Shearing Lag on Lateral Stability of Thin-Walled Open Member

The effect of shearing lag on lateral stability of thin-walled open member is studied by a simple method with sufficient accuracy. The shearing lag is reflected by shearing strain in the middle surface of the wall. Taking torsion and warping of the member,especially,shearing strain in the middle surface of the wall into account. an energy equation is formed. The equation is applicable to the lateral stability analysis of arbitrary prismatic thin-walled open member under arbitrary lateral load and boundary condition. By applying Galerkin's method of weighted residuals,some typical numerical examples are solved. The results are in good agreement with those from experiment and calculation by finite element method. The effect of shearing strain in the middle surface of the wall on the buckling is dicussed in detail.