西花拱坝温度应力场仿真研究及温控费用计算

发布时间：2018-07-10 15:54

  本文选题：拱坝 + 温控措施　； 参考：《西安理工大学》2017年硕士论文

【摘要】：拱坝是固结于基岩的空间壳体结构,具有超载能力强、工程量小等优点,近年来随着筑坝规模的增大得到了越来越广泛的应用。温度荷载是拱坝的一项主要荷载,温度应力过大可能会导致拱坝产生裂缝,危及大坝结构安全。因此,对拱坝进行温度场和温度应力场仿真计算具有十分重要的意义。对于大体积混凝土来说,其温控费用比重较大,对整个工程的投资都有一定的影响。对温控总费用进行初步估算,具有一定的理论和实用价值。首先基于有限元通用软件ANSYS,使用APDL语言编制西花拱坝温控仿真计算程序,包括前处理、求解、后处理部分等。前处理部分创建有限元模型、定义参数和划分网格。求解部分是利用ANSYS软件对划分好网格的整体计算模型进行有限元分析,同时建立平衡方程并求解得出计算结果。后处理部分就是对温度场及温度应力场计算结果进行处理,生成温度及应力云图,绘制温度及应力历时曲线。本文基于陕西省汉中市佛坪县西花水库枢纽工程,拟定了 3个温控设计方案:方案1是自然入仓浇筑,不采取温控措施;方案2是控制浇筑温度小于等于18℃;方案3是控制浇筑温度小于等于18℃并采取通水冷却措施;然后分别对西花拱坝进行了温度场及温度应力场仿真计算。通过对比分析3个方案的温度场及温度应力场计算成果,最终推荐方案3为温控设计方案。最终在推荐的温控方案基础之上,从材料制冷及通水冷却两个方面对温控费用进行了初步估算。根据热量平衡原理,针对不同的高温月份选取合适的材料冷却方式和通水冷却参数,结合工程概算定额和月混凝土浇筑强度计算得出了温控措施总费用。研究成果为西花拱坝温控措施的选择及温控费用控制提供了理论依据,具有重要的实际应用价值。
[Abstract]:Arch dam is a kind of space shell structure consolidated in bedrock. It has many advantages such as strong overload capacity and small engineering quantity. In recent years, it has been applied more and more widely with the increase of dam scale. Temperature load is one of the main loads of arch dam. Excessive temperature stress may lead to cracks in arch dam and endanger the safety of dam structure. Therefore, it is of great significance to simulate the temperature field and thermal stress field of arch dam. For mass concrete, the proportion of temperature control cost is large, which has a certain impact on the investment of the whole project. The preliminary estimate of the total cost of temperature control has certain theoretical and practical value. Firstly, based on the finite element software ANSYSand APDL language, the temperature control simulation program of Xihua arch dam is compiled, including pre-processing, solution, post-processing and so on. The pre-processing part creates the finite element model, defines the parameters and meshes. In the solution part, the finite element analysis of the whole meshing model is carried out by using ANSYS software. At the same time, the equilibrium equation is established and the calculation results are obtained. The post-processing part is to process the temperature field and the calculation result of the temperature stress field, generate the temperature and stress cloud diagram, draw the curve of temperature and stress duration. Based on the Hub Project of Xihua Reservoir in Foping County, Hanzhong City, Shaanxi Province, three design schemes of temperature control are worked out in this paper: 1 is natural pouring, no temperature control measures are taken, 2 is to control pouring temperature less than or equal to 18 鈩，

本文编号：2113867