Despite significant advances in metallurgy and the potential to create high ultra-high-strength steel, all international specifications for steel design provide little information about limits of slenderness high-strength sections (HSSs) don’t anything (UHSSs). The current codes such as AISC 360-16 EC3 can be applied only grades up S690 S460, respectively, according their limitations. These app...

Bat-inspired (BI) search is a recently developed numerical optimization technique that makes use of echolocation behavior of bats in seeking a design space. This study intends to explore capabilities and potentials of this newly developed method in the realm of structural optimization. A novel algorithm is developed that employs basic principles of this method for structural optimization proble...

This paper presents an ant colony system model for cost optimization of a composite floor system based on the load and resistance factor design (LRFD) specification of the AISC. The model formulation includes the cost of concrete, steel beam, and shear studs. The objective function is considered as the cost of the structure, which is minimized subjected to serviceability and strength requiremen...

This paper presents an experimental investigation of cold-formed built-up box section (CFBBS) stub columns infilled with lightweight aggregate concrete under concentric loading. The programme included a series twenty-four concrete-filled sections comprising by two nested thin-walled C-sections using breakstem rivets at flange and eight reference hollow for comparison purposes. These four differ...

in the aftermath of the 1994 northridge, california, earthquake. a significant number of steel moment resisting structural systems were damaged. many studies and researches have been conducted to improve the seismic performance of structures after the catastrophe. one of the proposed connections for special moment-resisting frames included aisc-358 is kaiser bolted bracket moment connection, br...

graph theory based methods are powerful means for representing structural systems so that their geometry and topology can be understood clearly. the combination of graph theory based methods and some metaheuristics can offer effective solutions for complex engineering optimization problems. this paper presents a charged system search (css) algorithm for the free shape optimizations of thin-wall...

McDermott [12,13] introduced the concept “Artificial Intelligence meets Natural Stupidity”. In this paper, we explore how Artificial Intelligence and Symbolic Computation can meet Natural Typography, and how the conventions for expressing mathematics that humans understand can cause us difficulties when designing mechanised systems.

Design by GMNIA (Geometrically and Materially Nonlinear Analysis with Imperfections) allows the key behavioural features of structures to be directly captured in analysis, improving accuracy dramatically reducing need for subsequent design checks. Since analysis frames typically employs beam elements, which local buckling cross-sections cannot explicitly simulated, cross-section classification ...

This paper attempts to improve the computational efficiency of the well known particle swarm optimization (PSO) algorithm for tackling discrete sizing optimization problems of steel frame structures. It is generally known that, in structural design optimization applications, PSO entails enormously time-consuming structural analyses to locate an optimum solution. Hence, in the present study it i...