Internal force optimization and experiment of variable parameter bridge based on energy methods

Abstract

Abstract: In order to determine the optimal internal force of variable parameter bridge, the model in the 14th National College Students’ structural design competition is theoretically analyzed and optimized, and the single objective linear optimization design mathematical model and the simplified calculation model of bridge structure are established. The exhaustive algorithm and Visual C++ programming is used for optimization calculation, including the optimization of bridge main span and the selection of load value at loading point, the static analysis, structural optimization design and actual model test are carried out. The numerical calculation formula is deduced, and the random optimization method of bridge span, load loading position and other parameters aiming at the minimum bending strain energy is proposed. The minimum values of vertical displacement and internal force of the structure under load are sought, obtaining the load layout. The span of the main span is inversely calculated. Then the finite element software is used for modeling analysis and experimental verification. Testing confirms that the load distribution mode 1 is the optimal load distribution, withP₁-P₈ values set to 40 N, 50 N, 120 N, 130 N, 60 N, 70 N, 80 N and 90 N.

Key words: bridge engineering, finite element analysis (FEA), exhaustive algorithm, optimization analysis, energy methods

CLC Number:

TU318+1

YANG Guo-jun, LI Xi-mei, ZHAO Hang, LYU Ming-hang. Internal force optimization and experiment of variable parameter bridge based on energy methods[J]. Journal of Lanzhou University of Technology, 2025, 51(3): 134-142.

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