大体积混凝土浇筑温度应力分析  

Analysis on the Temperature Stress of Mass Concrete Pouring

作　　者：吴源华 孙善星 WU Yuanhua;SUN Shanxing(Inspection and Certification Co.,Ltd.MCC,Beijing 100088,China)

机构地区：[1]中冶检测认证有限公司,北京100088

出　　处：《工程技术研究》2024年第23期25-28,共4页Engineering and Technological Research

摘　　要：大体积混凝土因其体积大、内外温差大,易产生温度应力和裂缝。文章采用数值模拟方法,建立了考虑水化热、冷水水管和边界热传导的三维模型,研究了不同入模温度对大体积混凝土温度应力的影响。研究表明,混凝土入模温度每升高1℃,最大拉应力增幅为0.048 MPa;混凝土入模温度越高,混凝土内部到达最高温度的时间越短,水化热反应越剧烈,控制入模温度对于降低温度应力而言至关重要。Mass concrete is easy to produce temperature stress and cracks because of its large volume and large temperature difference between inside and outside.This paper adopts numerical simulation method to establish a three-dimensional model considering hydration heat,cold water pipe and boundary heat conduction,and studies the influence of different mold entry temperatures on the temperature stress of mass concrete.The research results show that the maximum tensile stress increase is 0.048 MPa for every 1℃increase in the mold entry temperature of concrete;the higher the mold entry temperature of the concrete is,the shorter the time to reach the highest temperature inside the concrete is,and the more intense the hydration heat reaction is,so controlling the mold entry temperature is very important for reducing the temperature stress.

关 键 词：大体积混凝土 水化热 入模温度 温度场 应力场 数值模拟 

分 类 号：TU745[建筑科学—建筑技术科学]