About the author:

1. China Construction Third Engineering Bureau Group Co., Ltd, Wuhan 430074, China; 2. School of Civil Engineering and Hydraulic Engineering, Huazhong University of Science and Technology, Wuhan 430074, China; 3. Hangzhou Railway Hub Construction Command Headquarters of China Railway Shanghai Group Co., Ltd, Hangzhou 311500

Abstract:

With the continuous development of construction technology, the structures in modern engineering tend to be more complex and high-dimensional. Therefore, the structural model modification for such structures often faces the challenges of high solution difficulty and large amount of calculation. To solve this problem, a model modification method based on the combination of kriging and NSGA2 algorithm is proposed for large concrete W-shaped column structures. Firstly, the W-shaped column is divided into five segments for simulation, and the finite element model of the W-shaped column is established by MIDAS FEA NX software. The elastic modulus, bulk density, cross-sectional area i, and cross-sectional area j of the five segments are selected as the model modification parameters, and the Latin hypercube sampling method (LHS) is used to generate the combination of model modification parameters, and the settlement of the north and south sides of the W-shaped column under different parameter combinations is calculated. Taking the combination of model parameters as the input and the settlement of the north and south sides as the output, a kriging finite element surrogate model is established. At the same time, the objective function is established by minimizing the error between the measured settlement of the north and south sides of the W-shaped column and the finite element calculation results, and the NSGA2 multi-objective optimization algorithm is used for parameter optimization, and finally the modified parameters of the W-shaped column model are updated. Through verification, the settlements of the north and south sides of the modified W-shaped column are 203.0745mm and 203.0748mm, respectively, which are close to the actual measured results of 217mm and 218mm, which proves the practicability of the proposed method.