合龙及体系转换顺序对预应力连续梁桥的影响研究

Study on Influence of Closure and System Transition Sequence on Pre-stressed Continuous Beam Bridge

以吉安庐陵大桥为例,采用有限元分析软件对八种合龙及体系转换方案进行数值模拟,计算了不同方案合龙后的主梁竖向位移、箱梁应力、主梁次内力,结合施工监控实测应力数据,探讨了不同的合龙及体系转换顺序对该桥梁的位移和应力及次内力的影响,得出宜采用推荐方案作为合龙及体系转换方案,有关经验可供相关专业人员参考。

Taking Luling Bridge of Jian as an example,the finite element analysis software is used to numerically simulate eight closure and system transition schemes,and to calculate the vertical displacements of main beam,the stresses of box beam and the secondary internal forces of main beam after closured in the different schemes.According to the measured stress data of construction monitor,the article discusses the influences of the different closure and system transition sequences on the displacements,stresses and secondary internal forces of this bridge.The conclusion is that the recommended scheme is suitably used as the closure and system transition scheme.The relative experience can be referenced for the similar bridges.