Finite element simulation analysis of mass concrete foundation with embedded cooling water pipe

JU Youran; MA Haibin

doi:10.19956/j.cnki.ncist.2024.02.011

Abstract：To investigate the hydration heat process of large-scale raft foundation concrete and prevent the oc-currence 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 estab-lished 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 differ-ential 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 signifi-cantly 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 founda-tions of ultra-high-rise residential buildings.