有限元模拟分析大体积再生混凝土的开裂风险性

Risk of cracking prediction of recycled concrete based on finite element simulation analysis

针对大体积再生混凝土的开裂风险性,结合北京通州运河核心区南环环隧工程的实际工程环境,大体积再生混凝土的弹性模量和劈裂抗拉强度,采用MIDAS有限元仿真分析模拟大体积再生混凝土的温度场和应力场,得出温峰出现再生混凝土浇筑后的第48小时,中心点位置;最大温度应力小于再生混凝土的最大容许抗拉强度,不会产生收缩开裂,模拟仿真结果与实际实测结果较为吻合,同时给出再生混凝土的控制温度应力开裂的建议。

In view of the risk of cracking of mass regenerated concrete, the temperature field and stress field of mass regenerated concrete were simulated by the finite element analysis of MIDAS in combination with the actual engineering environment and conditions of the tunnel project of south ring of Tongzhou canal core area in Beijing and elastic modulus and splitting tensile strength of bulk recycled concrete. The maximum temperature stress is less than the maximum allowable tensile strength of regenerated concrete and will not produce shrinkage and crack. The simulation results are in good agreement with the actual measured results,and the Suggestions for controlling temperature stress cracking of regenerated concrete are given.