Impact Of Connection Detailing on Progressive Collapse: Bolted Vs. Welded Joints in Steel Frames

Abstract

The rapid growth of tall and slender buildings in contemporary architecture has increased the need for highly efficient lateral load-resisting systems. Steel diagrid structures have gained significant attention because of their structural efficiency, stiffness, and architectural adaptability.

This study investigates the optimization of steel diagrid systems to improve their performance under seismic and wind actions. A detailed parametric study is carried out by varying parameters such as diagrid inclination angle, member dimensions, and panel spacing. The influence of these parameters on key structural responses including lateral stiffness, inter-storey drift, and base shear is systematically evaluated.

Finite element modelling is used to develop accurate analytical models, and dynamic analysis procedures such as response spectrum analysis and time history analysis are performed to represent realistic loading scenarios. To determine the most efficient structural configuration, optimization approaches including genetic algorithms and multi-objective optimization techniques are applied. These methods aim to achieve an optimal balance between structural strength, stability, and material utilization.

The outcomes indicate that appropriately optimized diagrid systems can substantially enhance the lateral performance of tall buildings while reducing steel consumption and improving overall seismic resistance. The study offers practical guidance for structural engineers and designers seeking to develop sustainable, resilient, and high-performance tall building structures.