EXTREME THERMAL LOADING ON STEEL BRIDGES IN TROPICAL REGION
EXTREME THERMAL LOADING ON STEEL BRIDGES IN TROPICAL REGION
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DOI：
10.1061/(asce)1084-0702(2002)7:6(357
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发表时间：
2002-11
影响因子：
3.6
通讯作者：
M. Tong;L. Tham;F. Au
中科院分区：
文献类型：
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作者：
M. Tong;L. Tham;F. Au
在公路桥梁的设计中，无论跨度如何，重要的是要考虑桥面非线性温度分布引起的热应力。为了解决这个问题，许多桥梁设计规范都提供了设计温度曲线，这些规范通常基于对桥梁热行为的广泛研究。本文介绍了在香港进行的钢桥热性能综合调查的结果。简要讨论了根据给定气象条件预测桥梁温度的方法。理论结果已通过安装在建筑物屋顶以及现有钢桥上的实验模型的温度测量得到验证。理论和现场结果都证实了大多数设计规范所基于的一维传热模型的有效性。 50年一遇的设计热负荷值是根据香港40年气象资料的极端值统计而确定。制定了不同类型的不同沥青面层厚度的钢桥面板的设计温度曲线。
In the design of highway bridges, it is important to consider the thermal stresses induced by the nonlinear temperature distribution in the bridge deck irrespective of their spans. To cope with this, design temperature profiles are provided by many bridge design codes, which are normally based on extensive research on the thermal behavior of bridges. This paper presents the results of a comprehensive investigation on the thermal behavior of steel bridges carried out in Hong Kong. A method for predicting bridge temperatures from given meteorological conditions is briefly discussed. The theoretical results have been validated by temperature measurements on experimental models mounted on the roof of a building as well as on an existing steel bridge. Both the theoretical and field results confirm the validity of the one-dimensional heat transfer model on which most design codes are based. Values of design thermal loading for a 50-year return period are determined from the statistics of extremes over 40 years of meteorological information in Hong Kong. The design temperature profiles for various types of steel bridge deck with different thickness of bituminous surfacing are developed.