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首页> 外文期刊>Journal of aerospace engineering >Temperature Effects on Horizontally Curved Concrete Box-Girder Bridges with Single-Column Piers
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Temperature Effects on Horizontally Curved Concrete Box-Girder Bridges with Single-Column Piers

机译：单柱墩水平弯曲混凝土箱梁桥的温度效应

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Overturning failures of curved concrete box-girder bridges with single-column piers have occurred frequently in China in recent years. Lack of an appropriate design to resist the forces caused by unevenly distributed temperatures may be one of the main reasons for these failures. In design practice, only vertical temperature differences are accounted for in the design, and transverse temperature difference effects on curved bridges have been ignored. In order to achieve deeper understanding of temperature effects on curved concrete bridges with single-column piers, the authors studied solar radiation effects on a curved bridge, investigating the transverse and vertical temperature differences in the box girder using three-dimensional finite-element analysis. Then, the stresses and displacements of a curved bridge with different support arrangements were calculated and compared. The results show that the displacements and stresses caused by transverse temperature differences are comparable with those from vertical temperature differences in the curved box girder, which indicates that displacements and stresses are significantly underestimated by only considering vertical temperature differences for curved bridges. After comparing the stresses and displacements for different support layouts, it is concluded that the use of two pinned connected supports in the middle piers significantly reduces the vertical displacement by 46.2% under transverse temperature differences and by 55.6% under vertical temperature differences, whereas the thermal stresses do not vary with a change of support layouts. (c) 2019 American Society of Civil Engineers.
机译：近年来，具有单柱墩的弯曲混凝土箱梁桥的倾覆破坏在中国屡见不鲜。缺乏适当的设计来抵抗温度分布不均所引起的作用力可能是导致这些故障的主要原因之一。在设计实践中，只考虑了垂直温差，而忽略了横向温差对弯曲桥的影响。为了更深入地了解单柱墩的弯曲混凝土桥梁的温度效应，作者研究了弯曲桥梁的太阳辐射效应，并使用三维有限元分析方法研究了箱梁的横向和垂直温度差。然后，计算并比较了具有不同支撑布置的弯桥的应力和位移。结果表明，横向温度差引起的位移和应力与弯箱梁的垂直温度差所产生的位移和应力相当，这表明仅考虑曲线桥梁的垂直温度差会大大低估位移和应力。比较了不同支撑布局的应力和位移后，得出的结论是，在中间墩处使用两个销钉连接的支撑，在横向温度差异下，垂直位移显着降低了46.2％，在垂直温度差异下显着降低了55.6％，而热应力不会随着支撑布局的变化而变化。 （c）2019美国土木工程师学会。

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