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Performance-based seismic design of steel frames using constraint control method

ADVANCES IN STRUCTURAL ENGINEERING 2019年第12期22卷 2648-2661页

作者： Mansouri, Seyed Fazlolah Maheri, Mahmoud R. Islamic Azad Univ Dept Engn Sci & Res Branch Tehran Iran Shiraz Univ Dept Civil Engn Zand Av Shiraz *** Iran

In this article, the optimum performance-based seismic design of steel frames is performed using the novel constraint control method. This method is based on a simple concept generally used by the engineers in structural design. In this method, the most conservative member sections are initially selected and by gradually reducing the size of the sections through controlling the problem constraints, the solution tends to an optimum design. The capacity curve of the structure is evaluated through static nonlinear analysis and used for the seismic assessment, and the structural weight is optimized by controlling relative displacement constraints at performance levels of operational, immediate occupancy, life safety and collapse prevention. The performance and efficiency of the proposed algorithm in solving for optimum performance-based seismic design are assessed through solving three benchmark problems. The results show that using constraint control method drastically reduces the number of structural analyses required to reach a solution, compared to the more commonly used metaheuristic optimization methods, while producing comparable optimum solutions. For this reason, the constraint control method is found to be particularly suitable as an optimizer for solving solution-extensive problems, such as performance-based optimum design of structures.

关键词： constraint control method global search metaheuristic optimization algorithms nonlinear pushover optimum design performance-based design steel frames

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constraint control method of optimization and its application to design of steel frames

引用

SCIENTIA IRANICA 2019年第4期26卷 2241-2257页

作者： Mansouri, S. F. Maheri, M. R. Islamic Azad Univ Dept Civil Engn Sci & Res Branch Tehran Iran Shiraz Univ Dept Civil Engn Shiraz Iran

Different optimization methods are available for optimum design of structures including classical optimization techniques and metaheuristic optimization algorithms. However, engineers do not generally use optimization techniques to design a structure. They attempt to decrease the structural weight and increase its performance and efficiency, empirically, by changing the variables and controlling the constraints. Based on this professional engineering design philosophy, in this paper, a simple algorithm, termed the constraint control method (CCM), is developed and presented whereby optimum design is achieved gradually by controlling the problem constraints. Starting with oversized sections, the design was gradually improved by changing sections based on a 'control function' and controlling the constraints to be below the target values. As the constraints moved towards their targets, the design moved towards an optimum. The general functionality of the proposed algorithm was first demonstrated by solving several linear and nonlinear mathematical problems, which had exact answers. The performance of the algorithm was then evaluated through comparing design optimization results of three 2D steel frame benchmark problems with those of other metaheuristic optimization solutions. The proposed method led to the minimum structural weight while performing a considerably small number of structural analyses compared to other optimization methods. (C) 2019 Sharif University of Technology. All rights reserved.

关键词： constraint control method Optimum design Steel frames Metaheuristic optimization algorithms Global search

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