New Approaches in Civil Engineering

New Approaches in Civil Engineering

The effect of geometric dimensions and structural deformation on seismic response in high-rise buildings (by braced frame systems, "braced supports")

Document Type : Research Paper

Author
Alborz Danesh University،Abik, ،Qazvin Province، Iran
Abstract
Due to spatial constraints and population growth, high-rise construction has increased significantly. In these structures, mitigating lateral seismic forces is critical due to second-order (P-Delta) effects. While braced frames effectively control seismic response, determining their optimal configuration across various geometries remains challenging. This study investigates how plan dimensions (width and number of bays) influence the seismic response of high-rise braced frame systems. Forty-story steel buildings with constant length and height were analyzed, varying only the width (number of bays). Scenarios included models without bracing and those with one, two, or three braced axes. Non-linear static (Pushover) and dynamic (Time History) analyses were conducted in ETABS, evaluating roof displacement and inter-story drift. Results indicate that increasing the number of bays enhances effective lateral stiffness and reduces inter-story drift, yielding higher seismic stability. Non-linear analyses show a reduced collapse probability as the fundamental period decreases. Additionally, increased ductility in optimized structures allows them to withstand greater drifts under specific seismic events. Ultimately, this research confirms that plan geometry (specifically, the number of bays) is a decisive parameter for optimizing braced frame strategies and improving the seismic performance of high-rise buildings.
Keywords
Subjects

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