Thermal parameters inversion in hydration thermal process of concrete box girder based on SPSO algorithm
1. School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; 2. School of Highway, Chang′an University, Xi′an, Shaanxi 710064, China; 3. School of Materials Science and Engineering, Shijiazhuang Tiedao University, Shijiazhuang, Hebei 050043, China; 4. China Railway Eryuan Engineering Group Co., Ltd. , Chongqing 400023, China
Abstract：To improve the accuracy and convenience of obtaining thermal parameters for hydration thermal simulation analysis of concrete box girder by field and laboratory tests, the hydration heat process of a concrete box girder was used as experimental background. The literature research results were combined to determine the range of thermal parameters of concrete box girder, and the variance analysis was used to determine the sensitivity of each parameter to temperature and sort the parameters with high sensitivity as the parameters to be inverted. Based on standard particle swarm optimization(SPSO) algorithm and compared with genetic algorithm(GA), 5 parameters with high sensitivity were inverted. The results show that the hydration heat of cement has the greatest influence on the temperature during the pouring process of concrete box girder, and the intelligent algorithm can effectively invert the thermal parameters of concrete box girder. When the number of iterations is increased to a certain extent, the objective function corresponding to SPSO algorithm is smaller than the corresponding objective function of GA, and the convergence process curve of GA is relatively flat, while that of SPSO algorithm has mutation in the early stage.
2019, Vol. 40 
