克孜河南岸干渠跨河渡槽施工期温度应力耦合有限元分析
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摘要
针对新疆克孜河南岸干渠跨河渡槽处于高寒区,存在昼夜温差大、大流量、施工难度高的特点,通过三维有限元软件建立渡槽实体模型,模拟渡槽在施工期水泥水化热和外界气温变化而导致的渡槽内部混凝土的温度应力及环境温度变化,以及在温度骤然下降的情况下的渡槽内外温差应力分布规律。结果表明,施工期不采取任何保温措施会导致渡槽槽身温度应力随时超出允许范围,采取保温措施后,渡槽超范围温度应力消失,最终达到渡槽施工期间的防裂效果。
In view of the fact that the river crossing aqueduct across the south bank of the Keji River in Xinjiang is in a high-cold area,there is a large temperature difference between day and night,large flow,and high construction difficulty.The aqueduct solid model is established by three-dimensional finite element software to simulate the temperature stress and ambient temperature change of the concrete inside the aqueduct,caused by the change of cement hydration heat and outside air temperature during the construction period.And distribution law of temperature difference stress inside and outside aqueduct under sudden drop in temperature
In view of the fact that the river crossing aqueduct across the south bank of the Keji River in Xinjiang is in a high-cold area,there is a large temperature difference between day and night,large flow,and high construction difficulty.The aqueduct solid model is established by three-dimensional finite element software to simulate the temperature stress and ambient temperature change of the concrete inside the aqueduct,caused by the change of cement hydration heat and outside air temperature during the construction period.And distribution law of temperature difference stress inside and outside aqueduct under sudden drop in temperature
引文
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[2]季日臣,夏修身,房振叶,等.预应力混凝土箱形渡槽日照温度应力分析[J].兰州交通大学学报,2006,1.
[3]李玉河,吴泽玉.U形和矩形渡槽温度应力对比分析[J].人民长江,2008,39(16):67-68.
[4]冯晓波,王长德,管光华.大型渡槽温度场的边界条件计算方法[J].南水北调与水利科技,2008,6(1):170-173.
[5]宋书卿,王长德,冯晓波,等.空心渡槽的温度应力研究[J].中国农村水利水电,2005,11:86-88.
[6]耿运生,施炳利,和秀芬.南水北调渡槽侧壁温度场计算及保温材料应用分析[J].南水北调与水利科技,2005,3(6):22-24.
[7]李书群,和秀芬.南水北调中线洺河渡槽运行期温度影响及对策[J].南水北調與水利科技,2006,4(3):22-24.
[8]李晓克,张晓燕,张学朋,等.预应力混凝土渡槽温度影响及设计研究[J].长江科学院院报,2012,29(1):44-48.
[9]季日臣.大型梁式矩形渡槽结构分析中若干关键问题研究[D].西安:西安理工大学博士学位论文,2008.
[10]陈忠,张子明,倪志强.大型渡槽温度应力仿真研究[J].紅水河,2008,27(1):32-38.