分阶段施工对成桥后温度效应仿真分析的影响
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摘要
以山西某座连续刚构桥为例,运用有限元软件Midas Civil仿真分析了悬臂施工阶段中的收缩徐变等因素对结构成桥后箱梁应力的影响,得出了2种工况下由整体升降温以及温度梯度升降温而引起的温度应力,变化趋势一致,两者之差很小,只有在边中跨和中跨附近下缘的温度应力有较小的出入。最终得出采用有限元软件研究桥梁结构温度效应中是否考虑施工阶段对分析结果影响不大,可以省去施工阶段的分析。
Taking a continuous rigid frame bridge in Shanxi as an example,using the finite element software Midas Civil,the simulation analysis of the influence of the shrinkage and creep in the cantilever construction stage on the bridge box girder stress is carried out in this paper.The results show that under the two kinds of working conditions,the change trends of the temperature stress caused by the overall cooling and the temperature gradient increasing and decreasing are consistent,and the difference between which is very small,only has a small discrepancy in the side span and near across the lower edge.Therefore,whether considering the construction phase or not has only little influence on the analysis result of the temperature effect of the bridge structure by the finite element software,and the analysis of the construction stage can be omitted.
Taking a continuous rigid frame bridge in Shanxi as an example,using the finite element software Midas Civil,the simulation analysis of the influence of the shrinkage and creep in the cantilever construction stage on the bridge box girder stress is carried out in this paper.The results show that under the two kinds of working conditions,the change trends of the temperature stress caused by the overall cooling and the temperature gradient increasing and decreasing are consistent,and the difference between which is very small,only has a small discrepancy in the side span and near across the lower edge.Therefore,whether considering the construction phase or not has only little influence on the analysis result of the temperature effect of the bridge structure by the finite element software,and the analysis of the construction stage can be omitted.
引文
[1]吴海军,张雷,陆萍,等.沥青铺装层厚度对连续刚构桥主梁温度梯度应力的影响[J].重庆交通大学学报:自然科学版,2011,30(1):4-8.
[2]贺小春.矮墩刚构预应力混凝土连续箱型梁桥的温度效应研究[D].长沙:长沙理工大学,2013.
[3]周妞妞,张运波.薄壁空心高墩温度效应仿真分析[J].石家庄铁道大学学报,2013,26(4):27-31.
[4]何翔,方诗圣,方飞,等.不同梯度温度作用下曲线桥梁的温度效应分析[J].合肥工业大学学报,2012,35(8):1088-1092.
[5]刘夏平,孙卓,蔡卡宏,等.成桥混凝土箱梁温度场观测与温差分布研究[J].世界地震工程,2013,29(1):21-26.
[6]刘志宏,黄宏力.大跨径连续刚构桥的温度效应分析[J].交通科技,2005(5):51-53.
[7]胡明.桥梁工程大体积砼温度及温度应力计算[J].山西交通科技,2008(6):46-48.
[8]王解军,朱宇锋.大跨径连续刚构桥温度效应分析[J].中外公路,2010,30(6):92-96.
[9]周光伟.大跨预应力混凝土连续刚构桥施工控制研究及温度效应分析[D].长沙:湖南大学,2003.
[10]JTG D62-2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004.
[11]JTG D60-2004公路桥涵设计通用规范[S].北京:人民交通出版社,2004.
[2]贺小春.矮墩刚构预应力混凝土连续箱型梁桥的温度效应研究[D].长沙:长沙理工大学,2013.
[3]周妞妞,张运波.薄壁空心高墩温度效应仿真分析[J].石家庄铁道大学学报,2013,26(4):27-31.
[4]何翔,方诗圣,方飞,等.不同梯度温度作用下曲线桥梁的温度效应分析[J].合肥工业大学学报,2012,35(8):1088-1092.
[5]刘夏平,孙卓,蔡卡宏,等.成桥混凝土箱梁温度场观测与温差分布研究[J].世界地震工程,2013,29(1):21-26.
[6]刘志宏,黄宏力.大跨径连续刚构桥的温度效应分析[J].交通科技,2005(5):51-53.
[7]胡明.桥梁工程大体积砼温度及温度应力计算[J].山西交通科技,2008(6):46-48.
[8]王解军,朱宇锋.大跨径连续刚构桥温度效应分析[J].中外公路,2010,30(6):92-96.
[9]周光伟.大跨预应力混凝土连续刚构桥施工控制研究及温度效应分析[D].长沙:湖南大学,2003.
[10]JTG D62-2004公路钢筋混凝土及预应力混凝土桥涵设计规范[S].北京:人民交通出版社,2004.
[11]JTG D60-2004公路桥涵设计通用规范[S].北京:人民交通出版社,2004.
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