旧桥拓宽中拼接形式对旧桥受力的影响分析

结合合宁高速公路上一座连续刚构梁桥,应用空间有限元方法,分析了横向采用不连接、铰接、刚接等拼接方式时,汽车荷载作用下旧桥挠度、应力的变化及翼缘板根部应力状态。通过分析认为横向拼接有利于增大桥梁结构的整体刚度,减小旧桥挠度与梁体应力。随着拼接刚度增大,翼缘板悬臂根部应力变化较为复杂。

Influence of Connecting Method on Old Bridge Stress in Bridge Widening

Taking a continuous rigid frame bridge on Hening expressway as an example,this paper analyses the influence of connecting method on old bridge deflection, main girder stress and stress at cantilever root. Using space finite element analysis methods, it shows that the overall stiffness of the bridge structure increasing in favor of transverse connection, deflection and stress of old bridge was reducing. With the splicing stiffness increasing, the change of stress at cantilever root of old bridge is complex.