温降作用下大型箱型倒虹吸横向温度应力计算方法研究
[Abstract]:The general trend of water resources distribution in China is that the water resources in the south are less than in the north. In order to alleviate this problem and promote the motive force of the development of the national economy, the state has implemented the South-to-North Water transfer Project. South-to-North Water diversion Project opened water in 2014, effectively alleviating the water shortage in North China. As a cross structure, inverted siphon is widely used in the South-to-North Water transfer Project. In order to meet the need of water delivery, the inverted siphon structure of prestressed concrete with large section and multi-chamber is born, and the temperature stress of the buried inverted siphon structure is not paid much attention to. Recently, it has been pointed out that the influence of temperature load on the inverted siphon structure of embedded concrete. Therefore, the author thinks that it is necessary to pay attention to the temperature stress of the inverted siphon structure. The author begins with the simple inverted siphon in a single chamber and looks up the relevant literature. Under the assumption that the inverted siphon plate is a semi-infinite thick slab and the temperature change is harmonic, the analytical solution of the inverted siphon temperature field of concrete is obtained. Taking the temperature difference as the engineering control load, the temperature difference distribution function simplified by the analytic solution of the temperature field has the same function type as the temperature difference distribution function in the concrete railway bridge code. This explains the common problem of heat conduction in concrete structure, so the temperature distribution function above the bridge is applied to the inverted siphon. Based on the known temperature difference distribution function, the inverted siphon temperature stress is calculated. The concrete inverted siphon temperature stress is divided into the self-confined stress in the thickness range of the plate and the frame confined stress in the structure itself, and the total stress is the sum of the two stresses. The derivation of the formula of self-constrained stress and the derivation of frame constrained stress can be found in the relevant chapters of the article, which will not be restated here. With the calculation formula of temperature stress of inverted siphon in single chamber, the author deduced the formula of temperature stress of inverted siphon in two chambers and three chambers in turn. In the calculation of confinement stress of inverted siphon frame in multi-box chambers, the number of statically indeterminate structures is high. According to the calculation of structural mechanics, the calculation of inverted siphon temperature stress in multi-box chambers can be simplified into the calculation of temperature stress in a single chamber. This conclusion greatly simplifies the calculation of temperature stress of inverted siphon in multi-box chambers and improves the practicability of the formula. The author calculates the inverted siphon of two and three chambers respectively, and simulates it with ANSYS. The results are compared with the results of finite element method, and it is found that, whether it is the inverted siphon in the double chamber or the inverted siphon in the three chambers, The calculated results are in good agreement with the finite element results and can be widely used. It is also found that after the completion of the construction of the inverted siphon structure of multi-chamber prestressed concrete, there will be considerable temperature stress during the cooling period in winter. Threats to structural security should be strengthened during the operational process of structural safety supervision. In the end, the formula of temperature stress of concrete inverted siphon structure of multi-box concrete under the distribution of broken line temperature difference is deduced by using the distribution function of broken line temperature difference on highway bridge, and the same engineering example is taken to calculate the temperature stress. Compared with the calculated results of exponential temperature distribution function, the difference between the two results is less than 10%. The author thinks that this method can be popularized.
【学位授予单位】:兰州交通大学
【学位级别】:硕士
【学位授予年份】:2016
【分类号】:TV672.5
【参考文献】
相关期刊论文 前10条
1 季日臣;严娟;苏小凤;;混凝土箱形渡槽日照高温下结构安全研究[J];南水北调与水利科技;2013年06期
2 孙素艳;李原园;杨丽英;;我国水资源面临形势及可持续利用对策研究[J];人民长江;2011年18期
3 许四法;张豪;;农业灌溉水渠防渗土工膜的温度敏感性及张拉力评价[J];农业工程学报;2011年04期
4 赵山;赵湘育;吴泽玉;;矩形渡槽在寒潮作用下温度应力分析[J];人民黄河;2010年04期
5 王正中;芦琴;郭利霞;杨成有;杨富元;;基于昼夜温度变化的混凝土衬砌渠道冻胀有限元分析[J];农业工程学报;2009年07期
6 朱伯芳;;关于混凝土坝的几个新理念[J];水利学报;2008年10期
7 朱伯芳;杨萍;;混凝土的半熟龄期——改善混凝土抗裂能力的新途径[J];水利水电技术;2008年05期
8 王正中;李甲林;陈涛;郭利霞;姚汝方;;弧底梯形渠道砼衬砌冻胀破坏的力学模型研究[J];农业工程学报;2008年01期
9 李学军;费良军;任之忠;;大型U型渠道渠基季节性冻融水分运移特性研究[J];水利学报;2007年11期
10 季日臣;夏修身;陈尧隆;房振叶;;骤然降温作用下混凝土箱形渡槽横向温度应力分析[J];水利水电技术;2007年01期
相关博士学位论文 前2条
1 武立群;混凝土箱梁和空心高墩温度场及温度效应研究[D];重庆大学;2012年
2 刘西军;大体积混凝土温度场温度应力仿真分析[D];浙江大学;2005年
相关硕士学位论文 前1条
1 李彬彬;大体积混凝土温度应力有限元分析[D];西安建筑科技大学;2007年
,本文编号:2148814
本文链接:https://www.wllwen.com/kejilunwen/shuiwenshuili/2148814.html