Abstract:Based on the construction practice of the main pier base slab and the first pylon segment of the Zhongshan Hengmen West Grand Bridge, a construction simulation model of mass concrete is established by using MIDAS FEA to systematically study the evolution characteristics of the temperature field and stress field. The numerical results show that the maximum temperature control value inside the concrete is ≤75 °C, and the control value of the temperature difference between the inside and the surface of the concrete in this project is ≤25 °C. The simulated values of the temperature stress at each age of the precast sections of the base slab and the pylon are significantly lower than the allowable stress limit of the concrete, indicating that the crack-resistant safety margin of the structure meets the design requirements. The research results provide a technical basis for the optimization of temperature control parameters and the preventive control of cracks of the mass concrete.
