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利用混凝土箱梁整体受力性能优势,将其顶、底板均作为桥面系实现双层交通,是解决城市土地资源紧张和交通堵塞的不错选择。设计了1∶6比例双层交通混凝土箱梁模型,在弹性工作状态下进行了双层均布荷载试验研究,在双层集中荷载作用下进行了受弯全过程破坏试验。试验研究了关键截面应力-应变发展规律、荷载-挠度曲线、抗弯承载力及其破坏模态等。结果表明:弹性工作状态下按照不同工况在箱梁顶、底板施加均布荷载作用时,存在不同剪力滞效应;双层集中荷载作用破坏性试验证实了宽跨比、高跨比均较大的双层交通混凝土箱形截面梁的受弯破坏过程可分为弹性阶段、弹塑性发展阶段、最终破坏阶段。相关结论可为双层交通混凝土箱梁桥的设计和应用提供试验数据和理论依据。
The use of the overall performance of concrete box girder advantages, the top and bottom are used as deck system to achieve double traffic, is to solve the urban land resource constraints and traffic congestion is a good choice. The model of 1: 6 ratio double-decked traffic concrete box girder was designed. The double-layer uniform load test was carried out under elastic working condition. The whole bending failure test was carried out under double-layer concentrated load. The stress and strain development law, load-deflection curve, flexural capacity and failure mode of the key cross-section are studied experimentally. The results show that there are different shear lag effects when the uniform load is applied to the top and bottom of box girder under different working conditions under elastic working condition. The destructive test of double concentrated load shows that the ratio of width to span and height to span are The bending failure process of large double-decked concrete box girder can be divided into elastic stage, elasto-plastic development stage and final destruction stage. The relevant conclusions can provide experimental data and theoretical basis for the design and application of double-decked traffic concrete box girder bridge.