双层均布荷载作用腹板开孔混凝土简支箱梁模型试验研究分析

为实现城市双层交通，以1∶6比例设计了腹板开孔混凝土箱梁，对其在双层均布荷载作用弹性工作状态下的受力性能进行了试验研究。基于试验结果建立有限元模型对其进行分析，在理论值与试验值吻合的基础上，讨论了开孔与否对试验梁弹性阶段受力性能的影响。研究表明：均布荷载作用在双层箱梁底板其实测跨中挠度比相同荷载作用于顶板时增大9.7％，底板加载对腹板开孔混凝土简支箱梁的挠度有较大影响；较不开孔箱梁而言，各工况作用时开孔箱梁跨中挠度增大22.9％～28.1％，且开孔梁在各工况作用下截面剪力滞系数增大，最大增大量值达62.0％。因此，腹板开孔对承受双层荷载钢筋混凝土简支箱梁抗弯受力性能有较大影响。

Experimental Analysis of Simply-Supported Concrete Box Girder with Web Openings model Under Double Uniformly Distributed Load

In order to satisfy the demand of the double‐deck traffic in city ,a concrete box girder model with rectangular web openings was designed with ratio of 1 ：6. Experimental study was carried out to investigate the flexural capacity of the model girder with double uniformly distributed load .The finite element model was established based on the experiment and the results agreed with measurement results .The effect of the web openings on the girder was explored .The results demonstrated that the deflection caused by load on bottom plate of box girder was 9.7% more than that of load on the top plate .The deflection of girder with web opening is 22.9% ~28.1% greater than that of girder without web opening .Compared with girder without web opening ,the shear lag of girder with web opening increased ,of which the maximum value was 62.0% in various working conditions . simply‐supported concrete box girder with web openings under double uniformly distributed load affect the flexural capacity .