Study Of Simulation And Temperature Crack Control In Mass Concrete Of High-rise Building's Foundation

With the number of high-rise buildings rising in our country, the temperature crack of mass concrete foundation is becoming more and more prominent. In this paper, based on micro mechanics and fracture mechanics, the mechanism of concrete crack is analyzed, and the main factors of mass concrete in high-rise foundation are found.Combined the project example, the thermal-structure coupling of high-rise building foundation temperature field and temperature stress are analyzed with the Ansys software in this paper. The element discussion about the basic parameters in the finite element method of mass concrete is also made. The temperature field influence by the heat of hydration coefficient is studied. The proper heat of hydration span of mass concrete in high-rise building is determined. The concrete temperature field under the ground radiating are analyzed. The counting model of temperature stress is put forward considered the elastic ratio change and ground restraint。Through the analysis of the numerical simulation calculation, the key point of the crack control and the principles of constructional reinforcement under the temperature load are defined. The position and the thick region of constructional reinforcement are determined. According to the characteristics and demands of temperature field and temperature crack on the mass concrete, the mathematics model between the concrete materials with the concrete strength and stress is established. In this model, the object function is the highest temperature rise value, the principal bounds for object function are compression stress and crack resistance index. The genetic algorithm is applied to optimize the mixture proportion of mass concrete.