| Mass concrete structures are widely used in engineering.Due to the different construction conditions of specific projects,quality problems occur from time to time.Solving the problem of temperature rise and the crack caused by it is the key to ensure that the design and construction of mass concrete can meet the expected requirements.In this paper,taking a project in dalian as the research object,the temperature rise of mass concrete under different construction conditions is systematically studied,including the analysis of the temperature rise of mass concrete,the comparison between measured temperature rise and simulated temperature rise,and the study of temperature control measures.The analysis method is the combination of ANSYS numerical simulation and measured engineering data.The following tasks have been completed:The basic concept and structural characteristics of mass concrete are expounded,and the research history of mass concrete at home and abroad is summarized.define the temperature crack and introduce its formation process.The basic theory of temperature field of mass concrete is systematically summarized.Through the finite element analysis software ANSYS simulate the process of mass concrete pouring in engineering examples,and simulate the pouring situation according to different seasons,then get the law of temperature rise,and then carry out multi-scheme multi-level simulation under different working conditions,and finally put forward different temperature control measures for each season,so that the final construction plan can meet the requirements of relevant specifications.The theoretical hydration heat of cement is analyzed in numerical simulation,and the measured temperature and simulated temperature are compared and the error is analyzed.According to the comparison results and error analysis,the theoretical value is in good agreement with the actual hydration heat release,which can be used as the theoretical basis for calculation.It is proved that the finite element simulation results can be used as the basis and means to make the concrete construction plan.With the construction scheme determined by theoretical analysis and numerical simulation,the temperature rise index is within the control range,and no concrete cracking occurs,which verifies the validity and feasibility of theoretical analysis and numerical simulation.In addition to the above research results,this thesis also puts forward unique insights in the summary of temperature rise laws of mass concrete,temperature control measures,and selection of heat release formula for cement hydration.The construction was carried out with the construction scheme determined by theoretical analysis and numerical simulation.The temperature rise indexes were all within the control range and no concrete cracking occurred,which verified the effectiveness and feasibility of theoretical analysis and numerical simulation. |
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