五花山水库溢洪道大体积混凝土温度应力模拟研究

发布时间：2018-05-19 05:13

本文选题：大体积混凝土 + 温度应力场　；参考：《黑龙江大学》2014年硕士论文

【摘要】：大体积混凝土在目前的建筑工程中使用的频率很高,尤其是在水利工程的建设中。比如,大坝的建设时,会用大体积混凝土作为坝体材料；溢洪道建设时,也会使用大体积混凝土作为溢洪道主体结构。虽然大体积混凝土运用得极为广泛,但是在实际的工程中也存在着一些问题。当对建设物进行浇筑时,水泥释放的热量都聚集在一起,会使混凝土内外压力不一致,从而使浇筑块出现缝隙。针对此情况,大多数工程建设者会对其温度应力场进行探索研究,突破技术层面,解决这一问题。研究此类工程学的学者一般会利用计算机技术对大体积混凝土进行探索研究。目前,属数值仿真分析技术在此项目中使用得最多。在此,本论文将以ANSYS软件为主要研究手段,对大体积混凝土进行较为详细的介绍。大体积混凝土温度应力场与时间与空间息息相关,一般分为两个部分：温度场和应力场。在此,本文主体的对象是温度场：虽然大体积混凝土的面积大,但是由于水泥突然释放的热量太大,导致局部受热。温度应力的计算并没有十分简单,其计算手法反而极其繁琐,而且通常而言,其计算的数据也十分庞大。因为温度应力场的复杂性,所以在计算时,为了将复杂问题的简单化,一般采用有限元数值技术。有限元法是运用变分的方法将一些十分不规则的函数用其他简单函数代替,从而求得近似解。本论文利用ANSYS软件,具体地模拟大体积混凝土温度应力场。通过这种方式,得到计算过程中需要的边界条件并解决实际工程中所遇到的难题。同时,本论文着眼于实际,通过对比分析、资料查阅、实地研究,列出了与温度应力场有关的参数并建立了贴合实际工程的模型,更进一步地降低计算的难度。不仅如此,本论文通过模型与图像,较为系统的分析了温度场与应力场的物理情况,从而对浇筑尺寸进行调整,合理控制浇筑块之间的缝隙。
[Abstract]:Mass concrete is used very frequently in current construction projects, especially in water conservancy projects. For example, mass concrete will be used as dam material in dam construction, and mass concrete will be used as spillway main structure in spillway construction. Although mass concrete is widely used, there are some problems in practical engineering. When the building is poured, the heat released by the cement is gathered together, which makes the pressure inside and outside of the concrete inconsistent, and makes the pouring block appear cracks. In view of this situation, most of the constructors will explore the thermal stress field, break through the technical level, and solve this problem. Scholars who study this kind of engineering generally use computer technology to explore and study mass concrete. At present, numerical simulation analysis technology is used most in this project. In this paper, the ANSYS software as the main research means, mass concrete is introduced in detail. The temperature stress field of mass concrete is closely related to time and space and is generally divided into two parts: temperature field and stress field. The main object of this paper is the temperature field: although the area of mass concrete is large, the heat suddenly released by cement is too large, resulting in local heating. The calculation of temperature stress is not very simple, but the calculation method is extremely complicated, and usually, the calculation data is very large. Because of the complexity of the temperature stress field, in order to simplify the complex problem, finite element numerical technique is generally used in the calculation. The finite element method is to use variational method to replace some very irregular functions with other simple functions so as to obtain approximate solutions. In this paper, ANSYS software is used to simulate the temperature stress field of mass concrete. In this way, the boundary conditions needed in the calculation process are obtained and the problems encountered in practical engineering are solved. At the same time, this paper focuses on the reality, through comparative analysis, data reference, field research, listed the parameters related to the temperature and stress field, and set up a model to fit the actual engineering, further reduce the difficulty of calculation. Moreover, the physical situation of temperature field and stress field is analyzed systematically through the model and image in this paper, so that the pouring size is adjusted and the gap between the pouring blocks is reasonably controlled.
【学位授予单位】：黑龙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV651.1

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