寒潮期间早龄期箱形渡槽的温度效应分析.pdfVIP

第 3 9 卷 第 4 期 人 民 黄 河 V〇1.39 , No .4 2017年 4 月 YELLOW RIVER Apr .,2017 【工 程 建 设 管 理 】 寒潮期间早龄期箱形渡槽的温度效应分析 梁 飞 ，季日臣 (兰 州 交 通 大 学 土 木 工 程 学 院 ，甘 肃 兰 州 730070) 摘 要 ：采 用 ANSYS 有限元软件建立了山西中部引黄工程桥头渡槽混凝土 T 构 3 号块的有限元模型。在考虑昼夜气温 变化的条件下，模拟了寒潮期间该渡槽早期的瞬态温度场和应力场。结果表明：该槽段截面侧墙的外表面和顶板与侧墙 重叠处内外温差大，分 别出现3.4 M P a 和 3.9 M P a 的拉应力，需采取适当温控措施;计算节点的温度和温度应力都随昼夜 气温变化而波动，且波动幅度和气温变化幅度成正比；在遭遇寒潮袭击、平 均 气 温 下 降 6 尤 的情况下，内外温差变大，该 渡槽表面的应力提高0.5 MPa ，这对于早龄期混凝土防裂是不利的。 关 键 词 ：温度场；温度应力；有限元分析；早龄期混凝土；寒潮 中图分类号：TV 331 文献标志码 ：A doi:10.3969/j.iwn.1000-1379.2017.04.027 Temperature Effect Analysis of Early Age of Box Aqueduct During Cold W a v e LIANG Fei ，JI Richen (School of Civil Engineering ，Lanzhou Jiaotong University ，Lanzhou 730070, China) Abstract ： This paper used the ANSYS finite element software and established the finite element model of the 3 rd block of the Qiaotou aque­ duct that was an aqueduct in the Central Shanxi Yellow River Diversion Project. Under the conditions of considering the change of diurnal temperature ，the temperature field and stress field of this aqueduct were truly simulated during cold wave . Some conclusions have been ob­ tained through the calculation results. Sections of the aqueduct ，the outer surface of the side walls ，roof and side wall overlap appear 3.4 MPa and 3.9 MPa tensile stresses respectively because the concrete is thicker and the internal and external temperature difference is bigger. It is recommended taking appropriate measures to control temperature. The computed nodesr temperature and the temperature stress change ac­ cording to the change of diurnal temperature ，a