Numerical Simulation Of The Concrete Damage Plastic Coupling Under Temperature Effect And Application Research

Mass concrete thermal stress problems in the construction of modern engineering areattracting people’s attention increasingly. For a long time, to prevent the temperature crackof the concrete in mass concrete construction process is the key technical problem that wemust face in the engineering design and construction. Reasonable numerical simulation andanalysis of the calculation for the temperature field and thermal stress of mass concrete is acrucial prerequisite for the construction of mass concrete temperature control.First through the finite element software ABAQUS to simulate the Rock-fall impactshed tunnel and then study the dynamic mechanical response of the Rock-fall in differentimpact angles and speed of impact shed tunnel structure to provide the necessary basis forprotection engineering design of the Rock-fall. The feasibility of the concrete damagemodel has been verified by the numerical simulation of the actual engineering, which canprovide a strong theoretical and practical foundation for using concrete damage model next.Then through the finite element software ABAQUS again to analyze the temperature andstress field of rock-fill concrete gravity dam construction process. For the temperature fieldanalysis, ABAQUS secondary development platform has been used to consider concretehydration heat changes with age, the outside temperature changes with time, the impact ofthe thermal boundary conditions of concrete surface and layered pouring factors to the damtemperature field. In the stress field analysis, taking temperature field analysis results intoeach step of stress analysis to couple thermal stress analysis sequentially, considering theelastic modulus of concrete and weight load change with age, the stress value of everypoint in different moments for the dam can be known, then the stress field of the entiredam can be obtained.Through the results we have known that when the sixth layer of concrete pouring iscompleted, the highest temperature reaches at30.52℃in dam; the maximum tensile stressoccurs at construction joints near the dam heel because there are most constraints here, andthe maximum Mises stress is1.439MPa, the maximum tensile stress is1.557MPa. The results show that it is reliable to use the model to calculate the dam constructionsimulation.