混凝土结构温度应力的控制研究

Research on Thermal Stresses Control of Concrete Structure

在大体积混凝土工程施工中,由水泥水化热引起混凝土浇筑体内外温差和温度应力的剧烈变化,产生裂缝。因此,控制混凝土浇筑体因水泥水化热引起的温升、混凝土浇筑体的内外温差及降温速度,防止混凝土出现有害裂缝是施工技术的关键问题。结合工程实例,从混凝土材料的选择、配合比设计及混凝土的保温养护措施考虑,并用有限元程序分析了浇筑混凝土后产生最高温度和最大应力的时间,由分析结果提出具体措施指导施工,为大体积混凝土施工提供了理论依据。

Great temperature difference and thermal stresses are caused by heat of hydration of cement to lead to creaks during mass concrete construction processing. So, that is a key problem of construction technique to control temperature rise,temperature difference,velocity of temperature descent and prevent harmful cracks. Through a practical engineering, we start with measures of material choice, appropriate proportion and heat preservation maintain. With finite element analysis, the time of maximum temperature and thermal stresses can he observed. The specific control measures are put forward to instruct construction according to calculating results.