高速公路新老桥梁拼接方式探讨

通过建立梁格空间模型,分析了新老桥梁不同连接方式对活载横向分布以及对老桥受力性能的影响,分析了收缩徐变对拼接后的新桥支座反力的影响.研究结果表明：新、老桥间的连接方式对拼宽后桥梁的横向分布系数影响较小,但老桥的上部梁板在加宽后的横向分布系数较初始状态有较大幅度的减小,承受活载作用的能力有所增加;拼宽后,老桥的受力状态有所改善;收缩徐变对湿接缝相邻位置的梁板的支座反力影响较大,新桥支座设计时应选择承载力稍大的支座型号,确保支座有足够的抗压承载力.

Splicing Mode of New and Old Bridges on Expressway

In this paper, through the establishment of beam grillage space model, it analyzes the influence of different connection mode of new and old bridge on transverse distribution of live load and old bridge force performance, analyzes the influence of shrinkage and creep on the support reaction of new bridge after splicing. The results show that： The connection mode of new and old bridge has smaller effect on transverse distribution coefficient of the widened bridge, But the transverse distribution coefficient of upper beam slab of the old bridge is greatly reduced compared with the initial state, and its load capacity increases; the stress state of the old bridge after widened is improved; shrinkage and creep has great influence on the support reaction of the beam adjacent the wet joint, the support type that the bearing capacity is bigger should be selected when the new bridge is designed, in order to ensure the sufficient bearing capacity of the support.