双幅曲线连续钢-混组合箱梁剪力滞效应的研究

Study on shear lag effect of continuous steel-concrete composite box girder with double amplitude curve

剪力滞效应是钢混组合箱梁计算理论中不可忽视的问题,针对剪力滞效应对双幅曲线组合梁截面受力的影响,通过对三根双幅曲线连续钢-混组合箱梁进行试验研究,探究曲率半径对其剪力滞效应的影响规律;研究结果表明:曲率半径是影响剪力滞效应的关键因素,曲率半径越小,曲梁剪力滞效应越严重,截面应力分布越不均匀,因此要重视组合箱梁桥的曲率半径对受力性能的影响。研究可为实际工程提供参考价值。

Shear lag effect is an aspect that can not be ignored in the calculation theory of steel-concrete composite box girder.As to the influence of shear lag effect on the cross-section force of double amplitude curve composite beam,this paper carries out the experimental research on three continuous steel-concrete composite box girders with double amplitude curve,and explores the influence law of the curvature radius on shear lag effect.The results show that the curvature radius is the key factor affecting the shear lag effect,and the smaller the radius of curvature is,the more serious the shear lag effect is,and the more uneven the stress distribution will be,thus the influence of the curvature radius of the composite box girder on the mechanical performance should be paid attention to.The study will be of some reference to the actual project.