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李仁强,牌立芳,吴红刚,等. 异形大体积混凝土水化热研究及仿真分析[J]. 科学技术与工程, 2021, 21(24): 10452-10460.
Li Renqiang,Pai Lifang,Wu Honggang,et al.Research and Simulation Analysis on hydration heat of the Special-Shaped Massive Concrete[J].Science Technology and Engineering,2021,21(24):10452-10460.
异形大体积混凝土水化热研究及仿真分析
Research and Simulation Analysis on hydration heat of the Special-Shaped Massive Concrete
投稿时间:2020-08-26  修订日期:2021-08-12
DOI:
中文关键词:  异形大体积混凝土  水化热  温度场  应力场  冷却管
英文关键词:Special-shaped massive concrete  Hydration heat  Temperature field  Stress field  Cooling pipe
基金项目:中铁九局集团第六工程有限公司科技开发项目(FXZ-JSFW-007)
                 
作者单位
李仁强 中铁九局集团第六工程有限公司
牌立芳 中国铁道科学研究院
吴红刚 中铁西北科学研究院有限公司
刘纪飞 中铁九局集团第六工程有限公司
李锴 中铁九局集团第六工程有限公司
曹鹏飞 中铁九局集团第六工程有限公司
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中文摘要:
      本文主要研究了异形大体积混凝土在施工过程中的温度及应力变化规律,同时验证防止异形混凝土结构开裂的设计合理性。以龙游县景观云桥某异形大体积混凝土桥墩为工程背景,通过是否考虑冷却管对结构水化热的影响,利用大型有限元软件分别建立有限元模型进行仿真分析,研究结构内部温度沿厚度方向的时变规律,并对有无冷却管的结构温度场及应力场进行对比分析。结果表明:在浇筑过程中,结构中心部位温度先升后降,且伴随混凝土龄期的发展,混凝土内部高温区域逐渐缩小,且由起始浇筑中心位置逐渐沿厚度方向向下移动。结构早期应力由内外温差引起,且集中于外表面。异形桥墩内部温度场与常规形状桥墩分布变化规律基本相同,并且内部温度略低于后者。通过布置冷却管,能有效降低结构水化热,减小温度应力,有效控制表面温度裂缝的产生。
英文摘要:
      The temperature and stress changes of special-shaped mass concrete in the construction process was studied, and the rationality of the design to prevent cracks in the special-shaped concrete structure was verified in this paper. Taking a special-shaped mass concrete pier of landscape cloud bridge in Longyou county as the engineering background, the finite element models were established by large-scale finite element software to simulate whether the influence of cooling pipe on structural hydration heat was considered. Furthermore, the time-varying law of internal temperature along the thickness direction was studied, and the structural temperature field and stress field with or without cooling pipe were compared and analyzed. The results show that: In the process of pouring, the temperature in the center of the structure first rises and then falls. Additionally, the high temperature area inside the concrete gradually shrinks and moves downward along the thickness direction from the initial pouring center with the development of concrete age. The early stress of the structure is caused by the temperature difference between the inside and outside, and concentrated on the outside surface. The internal temperature field of special-shaped pier is basically the same as that of conventional pier, and the internal temperature is slightly lower than that of the latter. Through the arrangement of cooling pipes, the hydration heat of the structure is effectively reduced, the temperature stress is reduced, and the surface temperature cracks are effectively controlled.
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