Kajian Analisis Struktur Gedung 2D Dengan Ketidak beraturan Vertikal Menggunakan metode Nonlinear Pushover

Abstract

Multi-story buildings with vertical irregularities often experience uneven load distribution, which can affect the structural performance under lateral loads, particularly seismic forces. Vertical irregularities, such as varying column and beam dimensions between floors, can lead to significant increases in displacement and deformation on the upper floors compared to the lower floors. Therefore, it is crucial to evaluate the impact of vertical irregularities on the structure's behavior to ensure building safety. This study aims to analyze the impact of vertical irregularity on the behavior of multi-story buildings using the nonlinear pushover method. The analysis was performed using SAP2000 software to assess the structural capacity to withstand lateral loads, particularly seismic loads. The results show a significant linear relationship between story displacement and lateral forces (R² = 0.8898), as well as the impact of vertical irregularities that increase story drift and story drift ratio on the upper floors. The increase in story drift ratio exceeding the earthquake design standard limits may affect the stability of the structure. Furthermore, this study reveals that vertical irregularity can cause significant differences in forces on columns and beams between the lower and upper floors, increasing the risk of structural failure. Based on these findings, it is recommended to consider vertical irregularities in the design of multistory buildings, accounting for a more uniform distribution of forces throughout the building to ensure structural resilience against seismic loads. Structural Analysis of Multi-Story Buildings with Vertical Irregularities Using the Nonlinear Pushover Method Multi-story buildings with vertical irregularities often exhibit uneven load distribution, which can compromise structural performance under lateral loads, particularly during seismic events. Variations in column and beam dimensions between floors may lead to significant increases in displacement and deformation at the upper stories compared to the lower ones. Therefore, evaluating the impact of vertical irregularities on structural behavior is essential to ensure building safety. This study analyzes the effect of vertical irregularities on the behavior of multi-story buildings using the nonlinear pushover method. The analysis was carried out with SAP2000 software to assess the structural capacity to resist lateral loads, especially seismic loads. The findings reveal a strong linear correlation between story displacement and lateral forces (R² = 0.8898). Vertical irregularities were found to increase story drift and drift ratios at the upper levels. In some cases, the story drift ratio exceeded the limits specified by seismic design standards, potentially threatening structural stability. Furthermore, the study demonstrates that vertical irregularities result in significant variations in internal forces between columns and beams at different story levels, which may increase the likelihood of structural failure. Based on these results, it is recommended that vertical irregularities be carefully considered in the design of multi-story buildings to achieve a more uniform force distribution and ensure resilience against seismic loading.