宽箱连续组合梁桥受力特性分析

摘要

To study the influences of construction sequences and truck load arrangement ways on the continuous composite wide box girder bridge, the influences were analyzed by way of example of the north approach bridge of the Jiubao Bridge, Hangzhou that is now being constructed. The finite element program ANSYS was used to establish the plate shell and solid element models for the wide box girder of the bridge, the influences of concrete of the girder cast by different construction sequences (e. G. Cast in situ in one time or cast in situ at the midspan first and at supports late span by span) on the global mechanical behavior of the structure and the global and local mechanical behavior of the structure when truck load was arranged in different ways (e. G. Lane load+ concentrated force or wheel load) in the structural calculation were analyzed in specific details. The results of the analysis show that the construction sequences of the concrete have great influence on the mechanical behavior of long span continuous composite wide box girder bridge. The truck load arrangement way of wheel load can better simulate the global and local mechanical behavior of the structure as compared to the arrangement way of lane load + concentrated force.%为研究施工过程和汽车荷载布载方式对宽箱连续组合梁桥产生的影响,结合建设中的杭州九堡大桥北侧引桥进行分析.采用ANSYS有限元程序建立该桥宽箱组合梁的板壳和实体模型,分析混凝土采用不同施工过程(一次全部现浇和先跨中后支座逐跨浇注)对结构整体受力的影响及结构计算中汽车荷载按不同方式(按车道荷载十集中力和按车轮荷载)布置时结构的整体受力和局部受力情况.分析结果表明:混凝土的施工过程对大跨度宽箱组合梁的受力产生较大的影响；采用车轮荷载布载方式较采用车道荷载十集中力布载方式能更好地模拟结构的整体受力和局部受力状态.