Multi-parameter identification of concrete dam using polynomial chaos expansion and slime mould algorithm

This paper presents a novel methodology that combines polynomial chaos expansion and slime mould algorithm for multi-parameter identification of concrete dams. This methodology not only incorporates the merits of low computational cost in the polynomial chaos expansion and fast convergence of slime mould algorithm, but also considers the priori uncertainty in the input parameters by introducing statis-tical probability theory. By considering two examples with different complexity, this paper verifies the effectiveness of the proposed method with a univariate simply supported beam model, followed by a complex multivariate dam model to demonstrate its practicability in real engineering problems. In addi-tion, parameter sensitivity analysis of the dam model is conducted at an extremely low cost by polyno-mial chaos expansion based on Sobol' indices. Furthermore, the conventional parameter identification methods based on optimization methods directly combined with the finite element model are employed for comparison, highlighting two distinct advantages of the proposed method: (i) the proposed method improves the computational efficiency by nearly 52 times while ensuring a high accuracy, and (ii) the classical non-population optimization algorithm, Bayesian optimization, is used for comparison, reveal-ing the outstanding performance of slime mould algorithm in terms of convergence speed and robust-ness. The application of the proposed algorithm is not only limited to dams, but also it can be extended to any structure.(c) 2023 Elsevier Ltd. All rights reserved.