Analisa Kinerja Bangunan Beraturan dan Tidak Beraturan Horizontal pada SRPMK dengan Meninjau Kekakuan terhadap Torsi, Center of Mass, dan Center of Resistance Akibat Gempa

Abstract

Indonesia is a region located at the convergence of the Asian and Pacific earthquake belts, with Medan City, North Sumatra, being one of the areas with high seismic activity. Planning an earthquake-resistant structural system is crucial to prevent damage, especially in buildings with horizontal irregularity. This study aims to analyze the influence of horizontal irregularity in Special Moment-Resisting Frame (SMRF) systems on structural parameters such as the center of mass, center of rigidity, torsional stiffness, deflection, torsional angle, and column reinforcement requirements. Four building models were analyzed: rectangular, U-shaped, T-shaped, and L-shaped, with uniform area and column quantities. The analysis method used was response spectrum analysis with the assistance of MIDAS Gen Academic version 2023 software. The results show that the U-shaped building model exhibits the largest eccentricity, leading to greater torsion, torsional angle, and deformation. This results in increased internal forces in the columns and higher reinforcement requirements. This study provides important insights for designing irregular building structures to enhance their resistance to seismic loads.