Layout Optimization of Outrigger Braced System in Steel Tall Structures Using Meta- Heuristic Algorithms

As the height of building increases, requirements of structural stiffness and stability become more important than the strength criterion. Each tall structure basically behaves like a vertical cantilever under lateral loads and the outrigger-braced system is a favorable system in tall structures (Taranath, 1998). This type of structure has a central core connected to outer columns by outrigger trusses or strong girders. The position of outrigger-braced system has a significant impact on the structural efficiency. Therefore, determining the position of outrigger braces is an important part of design process; it is mainly done experimentally and does not lead to good economic results. In this study, the particle swarm optimization (PSO), modified dolphin echolocation (MDE), Enhanced colliding bodies optimization (ECBO) and grey wolf optimization (GWO) algorithms are utilized to determine the optimum position of outrigger-braced systems in tall steel structures.