百合郁江特大桥承台大体积混凝土温度裂缝研究

Research on temperature crack of mass concrete on the Pile Caps of Baihe Yujiang Long Span Bridge

承台作为桥梁结构的最重要的承力构件,对桥梁结构的整体受力发挥着极其重要的作用。由于铁路桥梁跨度大、载荷重,桥梁承台的结构尺寸较大,随着结构物截面尺寸的增加和混凝土强度的提高,由水化热导致的混凝土温度裂缝问题愈发凸显。以新建南玉铁路百合郁江特大桥P4号主墩承台为研究对象,通过采用Midas FEA有限元仿真软件进行建模分析,提出了采用低水化热混凝土材料、多层浇筑、埋设冷却水管、加强温度监控和混凝土养护等措施,对承台大体积混凝土的水化热进行有效控制,避免了温度裂缝的产生。

Taking the P4 main pier of Baihe Yujiang Long Span Bridge of newly built Nanyu Railway as example,Mi⁃das FEA finite element simulation software was used for modeling analysis.The effective measures to con⁃trol the heat of hydration of concrete are put forward,including the use of low heat of hydration concrete materials,multi-layer pouring,buried cooling water pipes,strengthening temperature monitoring and con⁃crete maintenance,etc.,to avoid temperature cracks in the mass concrete Pile Caps.