基于水化热分析的连续刚构桥零号块温度效应研究

发布时间：2018-03-17 00:36

本文选题：大体积混凝土　切入点：水化热　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：在我国建设事业大发展的背景下,各类工程建设的规模也朝着大型化的方向发展。对于混凝土结构来说,其大型化的结果是结构尺寸的增大,因此混凝土的用量必然增加,从而也导致了一系列的关于混凝土水化热温度效应的问题。在道路工程中,连续刚构桥是应用比较普遍的一种桥型,其零号块的混凝土浇筑方量比较大,且其内部的热对流条件不佳,容易使水泥水化作用产生的热量聚集在零号块内部,从而使其内部温度急剧升高,使得内外温差较大,造成温度应力过高,严重者甚至引起混凝土结构的开裂。因此,研究连续刚构桥零号块的水化热温度效应以及探讨其施工优化措施是很有必要的。本文通过专业桥梁有限元分析软件建立两座不同施工模式的连续刚构桥零号块的实体模型,并分别按照其实际的施工模式进行仿真分析,得出相应的计算结果后再进行比较和分析。总结了连续刚构桥零号块在不同施工模式下水化热和温度应力的发展变化规律,分析了各项参数以及施工模式的改变对于整个零号块水化热温度效应的影响。此外,笔者还基于实际施工模式的计算结果,改变计算参数和施工模式分别进行计算分析,探讨降低连续刚构桥零号块水化热和温度应力的施工优化措施,并得出了相应的结论。本文的计算与探讨能为以后类似桥型的施工控制起到积极的参考作用。
[Abstract]:Under the background of the great development of construction in our country, the scale of all kinds of engineering construction is also developing towards the direction of large scale. For concrete structure, the result of large-scale construction is the increase of structure size, so the amount of concrete must increase. This has also led to a series of problems concerning the temperature effect of concrete hydration. In road engineering, continuous rigid frame bridges are widely used as a bridge type, with a large quantity of concrete pouring in the zero block. The internal thermal convection condition is not good, and the heat produced by cement hydration is easily accumulated in the zero block, which makes the internal temperature rise sharply, and the temperature difference between inside and outside is larger, which results in too high temperature stress. Serious ones even cause cracks in concrete structures. It is necessary to study the effect of hydration heat temperature on block zero of continuous rigid frame bridge and to discuss its construction optimization measures. In this paper, two solid models of block zero of continuous rigid frame bridge with different construction modes are established by means of professional bridge finite element analysis software. According to the actual construction mode, the simulation analysis is carried out, the corresponding calculation results are obtained, and then the comparison and analysis are carried out. The development and variation laws of the heat of water and the temperature stress of the zero block of continuous rigid frame bridge in different construction modes are summarized. The influence of the parameters and the change of the construction mode on the hydration heat temperature effect of the whole zero block is analyzed. In addition, based on the calculation results of the actual construction mode, the calculation parameters and the construction mode are calculated and analyzed respectively. The construction optimization measures for reducing the hydration heat and temperature stress of block zero of continuous rigid frame bridge are discussed, and the corresponding conclusions are drawn. The calculation and discussion in this paper can play an active reference role in the construction control of similar bridge type in the future.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.23

【共引文献】