某大跨桥梁运营初期结构状态的检测与分析

为了防止大跨桥梁在运营中出现由于各种原因引起的损伤破坏,需对桥梁的运营状况进行长期监测,在经费困难的情况下,通过运营初期在不良时段对桥梁结构的应力及变形进行观测是一个较好的措施.以某大跨连续刚构桥为背景,连续2年每年在冬季最冷、夏季最热时采用精密水准仪对其承台的沉降、主梁的线形进行测量,采用振弦式应变传感器、辅以光纤传感器对各关键截面的受力情况进行测量.通过与桥梁设计值及有限元理论计算值进行对比可知,该桥承载力及线形无大的变异现象.实践证明该种检测方法操作简单、实用可行.

Inspection and Analysis of Structural Condition of a Long Span Bridge in Early Period of Operation

To prevent damage caused by a variety of reasons from occurring in long span bridge in its operation period,it is necessary to carry out long term monitoring for its operation condition.Under severe budget constraints,a good measure is to monitor the structural stress and deformation of the bridge in unfavorable time during the early period of operation.With a long span continuous rigid frame bridge as the background,the precision leveling instrument was adopted to measure the sedimentation of the pile cap and the geometry of the main girder in the coldest time of winter and the hottest time of summer in two successive years.Vibration wire sensors with the assistance of optical fiber sensors were used to measure the mechanical behavior of all the critical sections.It is found through the comparison of the design value and the value calculated by finite element theory that the bearing capacity and the geometry of the bridge show no great variation.Furthermore,it is proved by practice that the inspection method is simple and feasible.