桥梁拓宽中新旧桥梁连接方法和受力分析应用与研究

Research and Application of Method for Connecting New to Old Bridge and Stress Force Analysis in Bridge Widening Works

结合实际工程,研究了新旧桥梁之间的连接方法,研发了用于新旧桥梁连接的伸缩装置和沉降装置;采用有限元模型模拟新旧桥梁,分析了旧桥在拓宽后的内力变化,以及主梁位移变形的情况。结果表明:提出的新旧桥梁的连接方法在伸缩缝与沉降缝交点处可保持桥面平整,并有良好防水、防尘性能;老桥的主梁拓宽后在移动的车辆荷载作用下其内力较拓宽前减小很多,新桥的内力相应增加,说明新桥对旧桥的荷载起到了一部分的承担作用;新旧桥梁连接后,桥梁的整体性更好,受力更为均匀。

Based on actual projects,the method of connecting old to new bridge was studied,complete with the invented expansion and settlement devices for the connection between old and new bridge.A finite element model was used to simulate and analyze the change of internal force,displacement and deformation of main girder resulting from old bridge widening.The results show that the above method can level the bridge surface at the intersection of expansion and settlement joints,prevent the bridges from water and dust.Its internal force decreases a lot under the load of moving vehicles after main girder of the old bridge is widened,however,the internal force of the new bridge increases accordingly,which indicates that the new bridge bears a certain load instead of the old bridge,and the connected bridge structure has better integrity and bears evener stress force.