文章摘要
斜拉拱桥异形箱梁截面温度梯度效应分析
Analysis of temperature gradient effect on cable-stayed arch special-shaped box girder bridge
  
DOI:
中文关键词: 桥梁工程  温差应力  有限元理论  异形箱梁
英文关键词: bridge engineering  temperature stress  finite element theory  special-shaped box girder
基金项目:广东省交通厅科研项目(2004-20)
作者单位
王志美,舒小娟,汪旭 湖南科技大学 土木工程学院,湖南 湘潭 411201 
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中文摘要:
      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.
英文摘要:
      The analysis of temperature gradient effect special-shaped box girder is rear, both in China and abroad. Take a cable-stayed arch special-shaped box girder bridge for example, four conditions were taken according to four kinds of typical temperature gradient models, finite element software MIDAS/Civil was used to calculate the temperature stress causing by temperature gradient of the control sections. The sensitivity of temperature stress was analyzed, that about the temperature gradient models and exploring the change rule of the temperature stress value in the special-shaped beam section height and the longitudinal of the bridge. The results show that the maximum temperature stress in the longitudinal of the special-shaped box girder appears in the variable cross-section place. Temperature stress value under the temperature gradient model of New Zealand concrete design standard is the largest. The temperature gradient model in 04 standard has higher security reserves than that’s in 85 standard. Temperature stress in the special-shaped box girder cross section is very sensitive about the temperature gradient model, so choosing the local temperature gradient model at that time is very important.
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