带外伸横梁的钢箱梁桥横梁计算有效分布宽度研究

Research on Effective Distribution Width in Crossbeam Calculation of Steel Box Girder Bridge with Overhanging Crossbeam

为解决带外伸横梁的钢箱梁桥横梁计算有效分布宽度问题,借助无限长板带对位荷载下的应力分布研究结果,导出了不同桥宽和不同宽度外伸横梁对应的有效分布宽度扩散角;然后分别采用板壳有限元模型和梁单元模型对实际工程中超宽桥梁外伸横梁受力进行对比分析,以验证导出的有效分布宽度扩散角的实用性和有效性。结果表明:采用导出的有效分布宽度扩散角的梁单元模型计算结果与板壳有限元模型计算结果非常接近,且能够包络板壳有限元模型的计算结果,是偏于安全的。

In order to solve the problem of calculating the effective distribution width of the crossbeam of the steel box girder bridge with overhanging beam,with the help of the study of stress distribution under the alignment load of infinite long plate strip,the effective distribution width diffusion angle corresponding to different bridge widths and different widths of overhanging beams is derived,and then the practicability and effectiveness of the derived effective distributed-width spread angle are verified in the actual project by using the plate shell finite element model and beam element model respectively.The results show that the calculation result of the beam element model with the derived effective distribution width spread angle is very close to the calculation result of plate shell finite element model,and can envelope the calculation result of plate shell finite element model,and be partial to safety.