大体积混凝土承台水化热分析及管冷参数优化  

Analysis on hydration heat of massive concrete cap and optimization of pipe water cooling parameters

作　　者：王龙 鲁乃唯[1] 王柏文[1] Wang Long;Lu Naiwei;Wang Bowen(School of Civil Engineering,Changsha University of Science & Technology,Changsha 410114;Key Laboratory for Safety Control of Bridge Engineering,Ministry of Education and Hunan Province,Changsha 410114)

机构地区：[1]长沙理工大学土木工程学院,长沙410114 [2]桥梁工程安全控制省部共建教育部重点实验室,长沙410114

出　　处：《工程建设》2019年第4期1-5,17,共6页Engineering Construction

基　　金：国家重点基础研究发展计划("973"计划)项目(2015CB057701);交通部应用基础研究项目(2015319825120)

摘　　要：水化热是大体积混凝土结构产生裂缝的主要原因。为优化大体积混凝土承台管冷设计参数,采用有限元数值模拟方法建立三维仿真模型,分析了某在建大跨度斜拉桥索塔承台混凝土浇筑后产生的水化热,研究了承台内部高温梯度分布区域,并揭示了水化热发展规律;利用其水化热分析模块对管冷温度和冷却水质量流速设置多种对比工况进行了分析研究,从而优化了承台管冷设计参数,结果表明:选用自然水温20℃、冷却水质量流率1 500 kg/h,可达到较好的管冷效果。研究结果可有效预防水化热裂缝的产生,为同类型的工程实践提供借鉴意义。Hydration heat is the main cause of cracks in mass concrete structures.In order to optimize the cooling design parameters of massive concrete caps,the hydration heat produced by concrete pouring of pylon cap of a long-span cable-stayed bridge under construction is analyzed using a three-dimensional simulation model established byfinite element numerical simulation method,the high temperature gradient distribution region in the cap is studied,and the development law of hydration heat is revealed.The multiple comparative conditions of the tube cooling temperature and the cooling water mass flow rateare analyzed using the hydration heat analysis module,thus optimizing the cooling design parameters of the cap tube.The results show that the tube cooling effect is better when the natural water temperature is 20℃and the mass flow rate of cooling water is 1 500 kg/h.The research results can effectively prevent the occurrence of hydration heat cracks and provide reference for similar engineering practice.

关 键 词：大体积混凝土承台 水化热 管冷 冷却水温 冷却水质量流率 

分 类 号：U445.57[建筑科学—桥梁与隧道工程]