节段现浇预应力混凝土连续梁施工监控参数敏感性分析

Sensitivity Analysis of Construction Monitoring Parameters for Segmental Cast-in-place Prestressed Concrete Continuous Beam

连续梁在施工过程中一般需经历多次体系转换,不同的施工顺序及计算参数取值对桥梁线形及应力影响较大。文章以某公路预应力混凝土连续梁为研究对象,采用有限元软件Midas Civil建立计算模型,分析箱梁自重、预应力损失、支架刚度对桥梁线形及应力的影响。结果表明,混凝土自重及预应力损失对连续梁线形及应力影响较大,施工过程中需对桥梁线形及应力进行监测,并适时调整计算参数,使成桥后主梁线形及内力满足设计要求。

The continuous beam generally needs to undergo multiple system transformations during the construction process.Different construction sequences and calculation parameters have a great influence on the bridge alignment and stress.Taking the prestressed concrete continuous beam of a highway as the research object,this paper uses the finite element software Midas Civil to establish the calculation model,and analyzes the influence of box girder weight,prestress loss and support stiffness on bridge alignment and stress.The results show that the weight of concrete and the loss of prestress have a great influence on the alignment and stress of the continuous beam.During the construction process,the alignment and stress of the bridge need to be monitored,and the calculation parameters should be adjusted in time to make the alignment and internal force of the main beam meet the design requirements after the bridge is completed.