斜卷边槽钢偏心受压构件的稳定性分析

为进一步推动斜卷边槽钢在实际工程中的应用,明确其与直角卷边槽钢的区别,采用ANSYS非线性有限元程序,对共计70个算例的斜卷边槽钢在对称轴平面内偏心受压状态下的构件稳定性能进行分析.研究7种卷边弯起角度、10种偏心距对斜卷边槽钢偏心受压构件稳定承载力、失稳模式及变形等性能的影响.结果表明:偏心距对构件的承载力和失稳模式影响显著,所有构件均不是在偏心距为零时获得承载力的最大值.相同负向偏心距下,随卷边弯起角度的增大构件承载力逐渐降低;当卷边弯起角度达钝角后,各构件之间承载力相差较小,基本不再受弯起角度的影响.在正向偏心荷载作用下,越早出现畸变屈曲的构件承载力越低.

Stability behavior of channels with inclined simple edge stiffeners under eccentric compression loading

In order to promote the engineering application of the channels with inclined simple edge stiffeners and definite the difference between it and lipped channels,a total of 70 examples with seven stiffener inclined angles and ten different eccentricities under eccentric compression loading acted in the plane of axis of symmetry were selected to be studied by nonlinear finite element analysis using program ANSYS.Effects of the above parameters on stability capacity,buckling modes and deflection behavior of channels with inclined simple edge stiffeners under eccentric compression loading were investigated.The result shows that the stability capacity and buckling modes are notably affected by eccentricity.No member got the maximum carrying capacity at zero-eccentricity.At the same negative eccentricity,the carrying capacity of member gradually reduced with the stiffener inclined angles increasing,but little differences among the carrying capacities could be observed when the stiffener inclined angle is an obtuse angle,which doesn’t affect the carrying capacity anymore.The earlier distortional buckling occurred,the lower carrying capacity of member would be obtained under the positive eccentric compression loading.