连续刚构桥与连续梁桥线形监控影响因素对比分析

Comparative Analysis of the Influence Factors on the Linear Monitoring of Continuous Rigid Frame Bridge and Continuous Girder Bridge

为对比研究连续刚构桥和连续梁桥施工监控中的主要影响因素,对相同梁部结构的连续刚构体系和连续梁体系进行有限元建模,分析设计参数、预应力张拉阶段及合龙工序对梁体累计位移的影响,将梁体累计位移和合龙口两端的累计位移差作为线形监控难度的控制标准,对各种影响因素进行综合分析和评价。研究发现,相对于连续梁桥,预应力效应和合龙工序对连续刚构桥的影响较小。根据分析结果,指出预应力张拉时的结构体系对连续梁体系桥梁的累计位移影响较大,进一步分析了影响原因并提出较合理的合龙工序。

Finite element models of continuous rigid frame system and continuous beam system with the same beam structure are established in this paper to conduct a comparative study on the dominant influencing factors involved in the construction monitoring of rigid frame system and continuous beam system bridges, and the influences of design parameters, tensioning stage and closure procedure on the cumulative displacement of girder. The cumulative displacement of girder and the cumulative displacement difference of both sides of the final closures are set as control standards to classify the linear monitoring difficulty and the various involved influencing factors are comprehensively analyzed and evaluated. The results indicate that the pre-stressing effect and the closure process have little influence on the continuous rigid frame bridge compared to the continuous girder bridge. The results of the analysis show that the structural system formed according to different prestress tension process has bigger influence on the cumulative displacement of continuous girder bridge. The influencing factors are further analyzed for reaching an appropriate closure procedure.