不同荷载作用下T形连续梁和悬臂梁的剪力滞效应

对有机玻璃材质的T形连续梁和悬臂梁进行均布加载和集中加载,研究T形梁翼板在不同荷载形式作用下剪力滞的传递机理,并与理论计算进行对比.研究结果表明:连续梁在集中荷载作用时,仅在边缘支座处出现负剪力滞,而在均布荷载作用时,在连续梁中间支座截面两侧及相邻截面出现负剪力滞;悬臂梁在集中荷载作用时,仅在固定端及相邻截面出现正剪力滞,而在均布荷载作用时,仅在固定端处为正剪力滞;剪力滞效应的正负与剪力滞系数无关.

Shear Lag Effect of Continuous and Cantilever T-Beams Under Different Load Forms

The uniform loading and concentrated loading of continuous and cantilever plexiglass T-beam are carried out, and the shear lag transmission mechanism of the T- beam flange plates under different load forms is studied and compared with theoretical calculations. The results show that when the continuous beam is under concentrated load, negative shear lag occurs only at the edge supports, and when the load is uniformly distributed, negative shear lag occurs on both sides of the mid-support section of the continuous beam and adjacent sections. When the cantilever beam is under concentrated load, there is only positive shear lag at the fixed end and adjacent sections, and when the load is uniformly distributed, there is positive shear lag only at the fixed end; positive or negative shear lag effect has nothing to do with the coefficient of shear lag.