大体积承台有无冷水管的水化热定量分析研究  

Quantitative Analysis of Hydration Heat With or Without Cold Water Pipes in Large-Volume Bearing Platform

作　　者：陈好 CHEN Hao(Sichuan Highway and Bridge Construction Co.,Ltd,Bridge Engineering Branch,Chengdu 610041,China)

机构地区：[1]四川公路桥梁建设集团有限公司大桥工程分公司,四川成都610041

出　　处：《建筑经济》2023年第S02期560-565,共6页Construction Economy

摘　　要：本文以某项目嘉陵江特大桥主墩承台为依托,定量分析布置冷水管对于大体积混凝土水化热反应控制。利用MIDAS FEA NX有限元软件建立地基和承台部分的四分之一实体模型,分别得出施工阶段是否布置冷水管两种工况水化热,其次选取代表性节点A1~A6,得出在承台浇筑后布置冷水管前后的温度场和应力场结果。结果表明,承台设置冷却水管后可以有效降低大体积混凝土因水化热反应产生的里表温差和内部最大温升值,还可有效降低大体积混凝土浇筑288h后其最大拉应力,混凝土内部温度应力始终能控制在规范指标内,表面温度应力在288h后能得到较好的控制,这对减少承台混凝土的温度裂缝有积极作用。Based on the main pier bearing platform of Jialingjiang Special Bridge of a project,this paper quantitatively analyzes the control of the hydration heat reaction of large-volume concrete by arranging cold water pipes.Using MIDAS FEA NXfinite element software,established a quarter solid model of the foundation and bearing platform,determine whether to arrange cold water pipes for hydration heat during the construction phase,next,representative nodes A1~A6 were selected to obtain the temperature and stressfields before and after the placement of cold water pipes after the pouring of the bearing platform.The results indicate that the installation of cooling water pipes on the bearing platform can effectively reduce the internal surface temperature difference and maximum internal temperature rise of large volume concrete caused by hydration heat reaction,it can also effectively reduce the maximum tensile stress of large volume concrete after 288 hours of pouring,the internal temperature stress of concrete can always be controlled within the normative indicators,the surface temperature stress can be well controlled after 288h,which has a positive effect on reducing the temperature cracks of the concrete of the pile.

关 键 词：承台 大体积混凝土 水化热 冷却水管 温度场 应力场 

分 类 号：TU74[建筑科学—建筑技术科学]