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国内外关于异形箱梁温度梯度效应分析甚少.以某斜拉拱桥的异形箱梁为例,按照4种典型的温度梯度模式分为4个工况,利用有限元软件MIDAS/Civil,计算异形箱梁控制截面由温度梯度引起的温度应力,分析其对温度梯度模式的敏感性,探究温度应力在异形箱梁截面高度和箱梁纵向上的变化规律.结果表明:异形箱梁纵向上温度应力的最大值出现在箱梁的变截面处;新西兰混凝土设计规范温度梯度模式的温度应力最大;04规范温度梯度模式较85规范温度梯度模式有更高的安全储备.异形箱梁横截面温度应力对温度梯度模式的选取非常敏感,选取适合当时当地的温度梯度模式非常重要.
There are few domestic and international researches on the temperature gradient effect of profiled box girder. Taking the special-shaped box girder of a cable-stayed bridge as an example, it is divided into four working conditions according to four typical temperature gradient modes. Using the finite element software MIDAS / Civil, The temperature stress induced by temperature gradient in the control section of box girder is analyzed, and its sensitivity to temperature gradient mode is analyzed, and the variation regularity of temperature stress in the section height of box girder and box girder is explored.The results show that: The maximum value of temperature appears in the box girder variable section; New Zealand Concrete Design Code temperature gradient model temperature stress maximum; 04 standard temperature gradient mode than the 85 standard temperature gradient mode has a higher safety margin. The selection of the temperature gradient mode is very sensitive. It is very important to select the temperature gradient mode suitable for the local time.