大体积混凝土水化温度场仿真计算与实测技术研究

【作者】 范奎；

【导师】 王振林；

【作者基本信息】 浙江大学 ， 工程力学， 2005， 硕士

【摘要】 随着大体积混凝土结构在现代工程建设中的广泛应用,其结构性能与施工技术已成为工程界研究关注的热点之一。在混凝土浇筑和固化前期,水化热形成了复杂的温度场,由此形成的温度应力易于导致结构非载荷性开裂,对该类结构的承载性能与安全使用寿命造成不可忽视的威胁。 本文从混凝土水化温度场及相关计算方法论证入手,选择工程项目——浙江耀江大酒店基础浇筑水化温度控制为背景,采用 ANSYS有限元软件,初步仿真计算了基础浇筑前期五天内的温度分布规律,从而对用计算方法预测温度场,为实现温致开裂趋势评估和制订科学的降温施工工艺的目标提供了阶段性的成果。 论文期间,实施了传感器的高精度标定,开发出R-T专用转换软件,改造制成20CH自动切换器,制作的多测点长时间自动温度采集与转换仪器系统在高精度高效率完成现场温度监控中起到了重要作用,并有较广的拓展使用价值。现场测温获得的丰富数据规律对指导循环水降温和优化浇筑工艺起到了很好的作用。 最后对深入开展由仿真计算分析大体积混凝土结构的温度应力影响,优化实测监控技术提出了自己的构思与建议。更多还原

【Abstract】 With the widespread application of mass concrete structure in current engineering construction, the structure performance and construction technology become a focus of attention in engineering. In the prophase of mass concrete pouring and solidification heat of hydration formed complicated temperature field. The temperature field forms the temperature stress that cause concrete dehiscence without loading. The menace for structure load-carrying properties and secure service life can’t be ignored.This thesis begin with mass concrete temperature field of hydration and correlative reason of algorithm, select project "Zhejiang Yaojiang Hotel" as its background, adopt FEA software ANASYS, imitate temperature distribution in the front five days, supply phasic achievement of trend appraisal of temperature-caused-dehiscence and implement of scientific cooling technology.In the period of studying precise demarcate of sensor, developed R-T transition software, modify 20CH auto-transition. The long-time temperature collection and transition were made great use of in field temperature monitor. It will be wide used. A lot of data got by field thermometric take good effect in directing cycle-cooling and optimization of pouring.Finally, the conception and suggestion of numerical simulation are presented for the effects of thermal stress on the structure of massive concrete andoptimizing the technique of field measurement and monitoring.更多还原