基于冷却水管的大体积混凝土基础有限元仿真分析  

Finite element simulation analysis of mass concretefoundation with embedded cooling water pipe

作　　者：鞠悠然 马海彬[1] JU Youran;MA Haibin(College of Civil Engineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《华北科技学院学报》2024年第2期77-84,共8页Journal of North China Institute of Science and Technology

基　　金：安徽理工大学横向科研项目(HX2022032438)。

摘　　要：为研究大体积筏板基础混凝土水化热过程,避免因温差过大引起温度裂缝,以广州市锦佳华庭C2#超高层住宅楼筏板基础为依托,在ANSYS有限元软件中建立模型,对有无冷却水管情况下筏板基础的温度场和温度应力分布进行分析。研究结果表明:筏板基础出现裂缝的风险相对较高,需要实施适当的保护措施;冷却水管的降温效果明显,相比无冷却水管作用,温度峰值下降11.69℃,提前出现26小时,降温效率达到26.08%,且混凝土的温度应力均低于允许应力,不易产生裂缝;在现场实际测量中,基础里表温差最大值为16.1℃,单日最大降温速率1.7℃/d,实测数据均满足规范标准;基础在养护完成后,其外部未出现明显裂痕,证实以设置冷却水管为主的温控措施可以显著减少水化热的影响,减小内外温差以避免温度裂缝的产生;实测结果与有限元结果基本吻合,可为类似的超高层住宅建筑基础温控措施提供参考。To investigate the hydration heat process of large-scale raft foundation concrete and prevent the occurrence of temperature cracks due to excessive temperature differentials,the C2#ultra-high-rise residential building raft foundation of Jinjia Huating in Guangzhou is utilized as the basis for this study.A model is established in the ANSYS finite element software to analyze the temperature field and temperature stress distribution of the raft foundation with and without cooling water pipes.The research findings indicate a relatively high risk of crack formation in the raft foundation,necessitating the implementation of appropriate protective measures.The cooling water pipes demonstrate a significant cooling effect,with a temperature peak reduction of 11.69℃and an advance occurrence of 26 hours compared to the absence of cooling water pipes,resulting in a cooling efficiency of 26.08%.Furthermore,the temperature stresses in the concrete are all below the allowable stress,indicating a reduced likelihood of crack formation.Field measurements reveal a maximum temperature differential of 16.1℃within the foundation,with a maximum daily cooling rate of 1.7℃/d,all of which comply with regulatory standards.Upon completion of the foundation maintenance,no evident external cracks are observed,confirming that the predominant implementation of cooling water pipes as a thermal control measure can significantly mitigate the impact of hydration heat,thereby reducing the temperature differential between the interior and exterior to prevent the generation of temperature cracks.The experimental results are in basic agreement with the finite element analysis and can provide reference for similar thermal control measures in the foundations of ultra-high-rise residential buildings.

关 键 词：大体积混凝土 有限元分析 水化热 冷却水管 

分 类 号：TU7[建筑科学—建筑技术科学]