珲春大桥承台大体积混凝土水化热分析与监控

发布时间：2018-01-05 09:15

本文关键词：珲春大桥承台大体积混凝土水化热分析与监控　出处：《东北林业大学》2016年硕士论文　论文类型：学位论文

【摘要】：随着土木行业的大发展,桥梁领域里“承台大体积混凝土”一词出现的越来越频繁,与水利工程的大体积混凝土相比,承台大体积混凝土的强度等级要高,胶凝材料水化反应产生的热量多,承台大体积混凝土水化热的控制就变的不容易,加之受工期的影响,不少大体积承台于冬季低温季节施工,这对大体积承台水化热的控制又增加了难度。本文依托珲春大桥工程对大体积混凝土承台的水化热进行分析与研究,主要研究内容如下：(1)本文通过物理力学实验、热性能试验从拟定的配合比中选出最优配合比,通过物理力学试验分析不同掺合料对不同龄期混凝土强度的影响,通过热性能试验提出了混凝土绝热温升经验公式的修正系数。(2)利用Midas/FEA对珲春大桥的左、右幅6#承台分别建立仿真模型,定义裂缝指数,以限制裂缝产生为目的对模型进行调整,分析在无管冷、有管冷情况下大体积承台温度场、应力场的变化规律,利用Midas/FEA分析管冷性能对温度场、应力场的影响,得出适用于本工程的管冷技术参数,依据实际的模拟不同外界养护温度对承台温度场、应力场的影响,提出了分阶段的养护温度和内外温差控制值。(3)针对珲春大桥承台大体积混凝土的冬季施工提出了以“时时采集、时时分析、时时调整”为准则的动态监控,利用MATLAB软件的求解器功能,对监控过程中的数据信息进行即时处理,实现了对大体积混凝土的动态监控,最终达到了限制表面裂缝产生的目的,根据能量守恒定律推导管冷大体积混凝土中心温度经验公式,根据施工过程中存储的数据信息利用MATLAB的数据处理功能,针对计算管冷大体积混凝土中心温度的经验公式,结合实际监测数据提出了普遍适用的经验公式修正系数,为今后管冷大体积混凝土的设计、施工、监控提供了科学计算依据和研究方法。
[Abstract]:With the development of civil industry, bridge in the field of "mass concrete word appears more and more frequently, compared with the large volume concrete of water conservancy project, strength of mass concrete to produce high hydration of cementitious materials more heat, control of mass concrete pile caps of the hot water change is not easy, and the influence of time, many large volumebearingplatform in the winter cold season, the construction, the control of pile cap mass of hydration heat and increase the difficulty. This paper is based on the hydration heat of Hunchun bridge project to mass concrete analysis and research, the main research contents are as follows: (1) this paper through the physical mechanics experiment, thermal performance test from the intended mix in optimum mix ratio, through the analysis of different physical and mechanical tests of influence of admixture on concrete strength at different ages, through the heat performance test The correction coefficient of concrete adiabatic temperature rise formula proposed by Midas/FEA (2). Test of Hunchun bridge on the left and the right to establish the simulation model of 6# platform, the definition of crack index, to limit the crack for the purpose to adjust the model to analyse the cooling pipe, pipe cold case large volumebearingplatform temperature field and the variation of stress field, using the Midas/FEA analysis on the performance of pipe cooling temperature field, stress field, it is suitable for pipe cooling technology parameters of this project, based on the simulation of different curing temperature on the cap outside the actual temperature field, stress field, the temperature and temperature difference control value maintenance points stage. (3) according to the winter construction of large volume concrete bearing platform of Hunchun bridge is put forward to "constantly acquisition, constantly analysis, adjust" dynamic monitoring criteria, using the solver of MATLAB software can work, to monitor the process Real time data processing information, realizes the dynamic monitoring of mass concrete surface cracks, eventually reaching the limit, according to the law of conservation of energy is the large volume concrete pipe cold center temperature experience formula, according to the construction process of the data storage information using the data processing function of MATLAB, according to the empirical formula of tube temperature of cold mass the center of the concrete calculation, combined with the actual monitoring data of empirical formula is presented generally applicable correction coefficient, for the future of cooling pipes of large volume concrete design, construction, monitoring and provide a scientific basis for the study and methods.

【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445.57

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