نوع مقاله : مقاله پژوهشی
عنوان مقاله English
نویسنده English
In seismic design of steel structures، steel bracing is commonly adopted to resist the lateral forces. There are lots of possible for positions of the braces. The designer should consider all possible positions before deciding. The optimum positions of the braces are generally determined by trial and error. This process is practically impossible، even if the designer is experienced. In this paper، topology optimization of steel braces in 2-D steel frames is carried out using Genetic Algorithm. A multiple nonlinear segment fitness function is used considering the weight، stories drift، and combined stresses in the frames. Roulette Wheel and Tournament selections، two number of bits، and two kind of connections (Fully Restrained & Unrestrained) have been used. The frames have been optimized in five various cases. To analyze the frames، linear static، modal، and response spectrum analysis have been used. To analyze، design، and optimize the frame elements، the programs written in MATLAB software have been used. Finally، effect of selection methods، number of bits، and kind of connections is carried out. It is shown that in topology optimization of bracing، using fewer bits causes better results and ability of Roulette Wheel and Tournament selections are the same.
کلیدواژهها English
