悬臂波形腹板组合箱梁挠度计算方法研究

Study on Deflection Calculation of Cantilever Composite Box-girder with Corrugated Steel Webs

针对目前国内正在推广应用波形钢腹板组合箱梁,基于横向剪切变形对挠度影响的铁摩辛柯梁理论,推导出悬臂波形钢腹板组合箱梁的挠曲线计算方程。通过对悬臂有机玻璃波形腹板箱梁模型的加载试验和有限元分析,验证了挠曲线计算方程的正确性。结果表明,横向剪切变形产生的附加挠度对梁的挠度影响较大,悬臂波形钢腹板箱梁挠度计算时不应忽视附加挠度,剪切变形对悬臂箱梁挠度影响具有沿跨径方向逐渐减小的规律。

As to the application of the box-girder with corrugated steel webs in China now, the flexure curve equation of cantilever box-girder with corrugated steel webs was educed based on Timoshenko beam theory that deflection was affected by transverse shearing distortion. The correctness of the flexure curve equation of can- tilever box-girder with corrugated webs was tested and verified according to the loading experiment and finite element analysis on a organic glass model of cantilever box-girder with corrugated webs. The results show that the additional deflection caused by the transverse shearing distortion notably impacted on the defection, and that the additional deflection shouldn＇t be underrated when the deflection of cantilever box-girder with corrugated steel webs was calculated; the influence of deflection caused by the transverse shearing distortion declined gradually along the span length.