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| 预制T梁的水化热效应及温度应力影响因素研究 |
| Research on Hydration Heat Effect and Temperature Stress Influencing Factors of Prefabricated T‑beam |
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| DOI：10.16018/j.cnki.cn32-1650/n.202303008 |
| 中文关键词: 公路桥梁 预制T梁 水化热 温度应力 有限元分析 |
| 英文关键词: highway bridge prefabricated T-beam hydration heat temperature stress finite element analysis |
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| 中文摘要: |
| 以湖北省五峰土家族自治县湾潭镇某T梁桥的新建项目为工程背景，利用Midas FEA软件建立三维有限元模型，分析了预制T梁的温度场和应力场，研究了混凝土配合比、昼夜温差、寒潮对预制T梁温度应力的影响。结果表明: 预制T梁的最高温度出现在梁端肋板的马蹄部位内部，温度应力最大值尚在混凝土抗拉强度的控制范围以内；使用外加剂、掺合料可以一定程度上降低预制T梁的温度应力，降低开裂风险；昼夜温差越大，预制T梁的温度应力超过混凝土抗拉强度的幅度以及对应的龄期范围越大；寒潮会造成预制T梁温度应力的显著升高，且寒潮出现越早预制T梁产生的开裂风险越高。 |
| 英文摘要: |
| With a new T?beam bridge project in Wantan Town, Wufeng Tujia Autonomous County, Hubei Province as the engineering background, a three-dimensional finite element model was established to analyze the temperature field and stress field of prefabricated T-beam by using Midas FEA, and the effects of concrete mix ratio, diurnal temperature difference and cold wave on the temperature stress of prefabricated T-beam were studied. The result shows that the highest temperature of the prefabricated T-beam occurs inside the horseshoe part of the beam end rib, and the maximum temperature stress is still controlled within the range of concrete tensile strength. The use of additive and mixture can reduce the temperature stress of prefabricated T-beam to a certain extent and reduce the risk of cracking. The greater the temperature difference between day and night, the greater the range of the temperature stress of prefabricated T-beam exceeding the concrete tensile strength and the corresponding age range. The occurrence of the cold wave will cause the temperature stress of prefabricated T-beam to increase significantly, and the earlier the cold wave appears, the higher the cracking risk of prefabricated T-beam. |
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