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水闸闸墩施工期温度场和应力场的仿真计算分析
引用本文:王振红,朱岳明,于书萍,王方勇. 水闸闸墩施工期温度场和应力场的仿真计算分析[J]. 天津大学学报(自然科学与工程技术版), 2008, 41(4): 476-481
作者姓名:王振红  朱岳明  于书萍  王方勇
作者单位:[1]河海大学水利水电工程学院,南京210098 [2]湖北省水利水电勘测设计院北京分院,北京100055 [3]河北工程大学水电学院,邯郸056021
基金项目:国家自然科学基金 , 水利部科技创新项目 , 河海大学校科研和教改项目
摘    要:结构的内外温差、基础温差是混凝土结构施工期易开裂的主要原因,为此,结合混凝土温度场、应力场的基本原理和水管冷却的精确算法,通过三维有限单元法对施工期某水闸闸墩进行仿真计算,分析闸墩混凝土施工期温度场、应力场的时空变化规律,得出在温降阶段闸墩门槽处是裂缝容易出现的地方.计算结果表明,表面保温和内部水管降温相结合的温控措施既能减小结构的内外温差又能降低结构的基础温差,具有良好的防裂效果,且模板外面贴保温板的保温方法能使混凝土表面的施工质量得到明显改观,值得应用推广.

关 键 词:枣核形裂缝  闸墩  温控防裂  温度场  数值模拟

Simulation and Analysis of Temperature Field and Stress Field of Sluice Pier Concrete During Construction
WANG Zhen-hong,ZHU Yue-ming,YU Shu-ping,WANG Fang-yong. Simulation and Analysis of Temperature Field and Stress Field of Sluice Pier Concrete During Construction[J]. Journal of Tianjin University(Science and Technology), 2008, 41(4): 476-481
Authors:WANG Zhen-hong  ZHU Yue-ming  YU Shu-ping  WANG Fang-yong
Affiliation:WANG Zhen-hong, ZHU Yue-ming, YU Shu-ping, WANG Fang-yong (1. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China; 2. Hubei Institute of Water Conservancy and Hydroelectric Engineering Exploration and Design Beijing Branch, Beijing 100055, China; 3. College of Hydraulics and Electric Power, Hebei University of Engineering, Handan 056021, China)
Abstract:In view of the problem of concrete cracks in construction period, the internal and external temperature difference and the basic temperature difference are considered as the main factors inducing the phenomena. Under the basic theories of temperature field and stress field of concrete, the 3-D FEM with the numerical algorithm of pipe cooling was adopted to simulate the temperature field and stresses field of sluice pier during construction. Through analyzing the time-space variation law, it can be found that cracks usually appear at gate slots in the stage of temperature drop. The results also show that the combination method of external heat preservation and internal cooling water pipes can decrease the temperature difference at early age and the basic temperature difference in later stage. Feedback information from fieldwork indicates that good effect of temperature control and crack prevention has been achieved. At the same time, the method of external insulation board also makes the quality of surface concrete obviously improved, so it deserves to be popularized.
Keywords:concrete crack similar to Chinese date core  sluice pier  temperature control and crack prevention  temperature field  numerical simulation
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