Temperature effects on cable stayed bridge using health monitoring system: a case study
Temperature effects on cable stayed bridge using health monitoring system: a case study
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DOI：
10.1177/1475921710388970
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发表时间：
2011-09-01
影响因子：
6.6
通讯作者：
Wang, Ming L.
中科院分区：
文献类型：
--
作者：
Cao, Yinghong;Yim, Jinsuk;Wang, Ming L.
湛江湾大桥位于中国南部的内海湾，是一座主跨480米的斜拉桥。根据2006年开始运行的健康监测系统（HMS），对该桥经历的热效应进行了分析。分析中研究的参数包括钢箱梁、混凝土塔和斜拉索的热滞后和热梯度，以及塔跨中心和塔顶的位移。其中，钢梁内部温度梯度大于设计规范，混凝土温度滞后于环境空气温度，斜拉索温度介于环境空气温度与混凝土温度之间。通过将测量数据与使用有限元模型计算的值进行比较，获得了其他发现。通过比较，可以近似计算出塔楼表面未测量的热梯度，并确定伸缩缝可能被卡住，从而导致桥梁的不对称位移。本文以彻底的方式呈现了这些发现，并通过这样做传达了HMS提供热行为的实际示例的能力，以估计没有测量设备的位置的条件，并建议未来人工检查的关注领域。同时也证明了HMS不仅有利于桥梁的设计和管理，而且有利于桥梁自身的发展。
The Zhanjiang Bay Bridge, located in an inner gulf of South China, is a cable stayed bridge with a main span of 480 m. An analysis on the thermal effects experienced by the bridge is presented according to a health monitoring system (HMS) that began operation in 2006. The parameters studied in the analysis include thermal time lags and gradients of the steel box girder, concrete tower, and stayed cables, as well as displacements at center span and tops of the towers. Among the findings, temperature gradient in the steel girder was larger than the design specification, concrete temperature lagged significantly behind ambient air, and stayed cable temperatures were between those of ambient air and concrete. Additional findings were obtained by comparing the measured data to values calculated using a finite element model. The comparison made it possible to approximate the unmeasured thermal gradient on the surface of the towers, and to determine that an expansion joint was likely jammed and contributing to the bridge's asymmetrical displacement. This article presents these findings in a thorough manner, and in doing so conveys the ability of a HMS to provide realistic examples of thermal behavior, to estimate conditions at locations free of measurement devices, and to suggest areas of concern for future manual inspections. Furthermore, it provides evidence that a HMS is not only helpful for bridge design and management, but also for the development of itself.