预应力混凝土T梁变宽拼宽静力特性分析

基于一座4×30 m预应力连续T梁变宽拓宽桥,分别建立新旧桥间布置与旧桥相同数目横隔板、新旧桥间仅跨内设置横隔板而墩顶不设置横隔板和新旧桥间不设置横隔板3种不同横向连接的ANSYS有限元模型,计算和比较了其在汽车荷载、新旧桥差异沉降荷载、温度荷载以及收缩徐变作用下的静力性能。分析表明:新旧桥间设置横隔板,可以显著改善荷载横向分布,降低主梁纵向应力和接缝横向应力。因此推荐新、旧桥间全部设置横隔板的连接方案,供设计参考。

Research on Static Behavior of Broaden Spliced Prestressed Concrete T-type Beam Bridges

Based on a 4 × 30 m continuous prestressed T-type bridge under widening construction,three finite element transverse connection models including number of diaphragms which connecting old and new bridges same as that of the old bridge,only diaphragms in the sections of spans,and no diaphragmconnection old and new bridges established using ANSYS software.The static performances of the broaden bridge under the action of traffic load,load from settlement difference.temperature load as well as load from shrinkage and creep were callculated and compared.The analysis shows that the fully set up of diaphragms which connecting old and new bridges can significantly improve the lateral load distribution and reduce the main beam longitudinal stress as well as transverse stresses of joints.Therefore such connection scene was recommend as a reference for the design.