Insights into temperature effects on structural deformation of a cable-stayed bridge based on structural health monitoring
Insights into temperature effects on structural deformation of a cable-stayed bridge based on structural health monitoring
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基于结构健康监测的温度对斜拉桥结构变形的影响
DOI：
10.1177/1475921718773954
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发表时间：
2018-06
影响因子：
6.6
通讯作者：
Sun Limin
中科院分区：
文献类型：
--
作者：
Zhou Yi;Sun Limin
结构变形是桥梁健康监测中的重要考虑因素，其对温度变化的依赖性相当复杂。基于对一座运营中的斜拉桥进行的现场测量，通过平面几何分析和有限元分析，研究了温度引起的梁长和跨中挠度变化的机理。本研究的目的是了解这种桥梁的行为在年度和昼夜周期。斜拉桥的主梁长度和跨中挠度表现出不同的温度响应相关模式。热引起的梁长变化完全由梁的平均温度，其振幅的年变化明显大于日变化。然而，热引起的跨中挠度同时受到拉索温度和主梁平均温度的影响，并且这些温度并不随温度单调变化，从而导致年周期和日周期的变化幅度几乎相等。斜拉桥的温度变形可以通过单个构件的热膨胀效应的多重线性叠加来近似。对称双塔斜拉桥跨中挠度的温度依赖性除了与结构材料的热膨胀系数有关外，还与塔高与主梁中跨的比值以及边跨与中跨的跨长比密切相关。提出的简化公式来估计温度效应的敏感性可以很容易地扩展到其他斜拉桥与不同的几何布局，从而提供了宝贵的见解，这种桥梁的热致变形。
Structural deformation is an important consideration in the health monitoring of bridges, and its dependence on temperature variations is quite complex. Based on field measurements performed for an operational cable-stayed bridge, the proposed study investigates mechanisms of thermally induced variations in girder length and mid-span deflection through plane geometric and finite element analyses. The objective of this study is to understand the behaviour of such bridges over annual and diurnal cycles. It has been observed that the girder length and mid-span deflection of a cable-stayed bridge exhibit different modes of the temperature–response correlation. Thermally induced changes in girder length are solely governed by the average girder temperature, and its annual variation in amplitude is significantly larger compared to the diurnal variation. However, thermally induced mid-span deflections are simultaneously influenced by the cable temperature and average girder temperature, and these do not vary monotonously with temperature, thereby resulting in nearly equal variation amplitudes over both annual and diurnal cycles. Temperature-induced deformations of a cable-stayed bridge could well be approximated through multiple linear superposition of thermal-expansion effects of individual components. Besides thermal-expansion coefficients of structural materials, the temperature dependency of mid-span deflection of a symmetrical twin-tower cable-stayed bridge is closely related to the ratio of tower height above the deck to central span of the girder as well as span ratio of the side span to central span. The proposed simplified formulae to estimate the sensitivities of temperature effects could be readily extended to other cable-stayed bridges with different geometric arrangements, thereby providing valuable insights into thermally induced deformation of such bridges.
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DOI：
10.1177/1475921710388970
发表时间：
2011-09-01
影响因子：
6.6
作者：
Cao, Yinghong;Yim, Jinsuk;Wang, Ming L.
通讯作者：
Wang, Ming L.
影响因子：
5.4
作者：
You-lin Xu;Bo Chen;C. Ng;K. Wong;W. Y. Chan
通讯作者：
You-lin Xu;Bo Chen;C. Ng;K. Wong;W. Y. Chan
DOI：
10.1177/1045389x06055826
发表时间：
2006-05
影响因子：
2.7
作者：
Yong Zhu;Yumei Fu;Weimin Chen;Shanglian Huang
通讯作者：
Yong Zhu;Yumei Fu;Weimin Chen;Shanglian Huang
影响因子：
3.6
作者：
R. Westgate;K. Koo;J. Brownjohn
通讯作者：
R. Westgate;K. Koo;J. Brownjohn
影响因子：
2.6
作者：
S. Desjardins;N. A. Londoño;D. Lau;H. Khoo
通讯作者：
S. Desjardins;N. A. Londoño;D. Lau;H. Khoo