Optimization method of steel concentrically braced frame&nbsp; based on yield mechanism control

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (15) : 285-297.

Optimization method of steel concentrically braced frame based on yield mechanism control

LI Bin1, WANG Zhan1, FAN Yanjing1, PAN Jianrong1, WANG Peng1,2, ZHOU Zhenfeng1

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Abstract

Based on the inequality interactive analysis of the different structural components bearing capacity, the yield mechanism control method of steel concentrically braced frame was proposed. Then, the improved genetic algorithm was used to propose the structural optimization method based on the yield mechanism control with the structural total weight as the objective function. Furthermore, the published experimental data, 48 finite element models and several steel concentrically braced frame examples were verified the validity of the structural yield mechanism control method, the computational efficiency and accuracy of the optimization method. The results show that the component parameter ranges calculated by the proposed method could effectively control the yield sequence of the structural components. In the engineering practice application, the sequence is, however, highly sensitive to components’ parameter values, which was not suitable for selecting the maximum or minimum values of range. The brace’s external diameter should be selected larger within the parameter range to avoid premature yield of compression brace. Meanwhile, the parameter ranges calculated by the yield mechanism method also could greatly reduce the initial solution domain space, which could improve the computational of the optimization analysis.

Key words

steel concentrically braced frame / yield mechanism control / iterative computation of inequality / optimization method / numerical simulation

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LI Bin1, WANG Zhan1, FAN Yanjing1, PAN Jianrong1, WANG Peng1,2, ZHOU Zhenfeng1. Optimization method of steel concentrically braced frame based on yield mechanism control[J]. Journal of Vibration and Shock, 2023, 42(15): 285-297

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