Sal, Kristoforus Setiawan (2022) Pengaruh Ketidakberaturan Soft Story Dasar pada Bangunan dengan Core Wall Terhadap Kinerja Struktur Berdasarkan SNI 1726-2019. Undergraduate thesis, Fakultas Teknik Universitas Merdeka Malang.

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Abstract

High-rise buildings such as office buildings, hotels, and apartments that have a ground floor with a column that is higher than the column above it result in a first soft story. The ideal condition for high-rise buildings is the vertical stiffness of regular structures no soft story, the difference in stiffness between stories must be less than 30% or less than 20% of the average stiffness of the three stories above based on SNI 1726-2019. Soft level stiffness results in decreased structural performance. Increasing the stiffness and strength of the building is a solution to overcome the irregularity of a soft story. There fore the structure is designed using shear walls.

The structure being reviewed is a 12-story building with a core wall at the core of the building, located in Kupang City. Loading uses SNI 1727-2019 and 1727-2013, seismic force analysis uses the dynamic response spectrum analysis method based on SNI 1726-2019. Structural modeling is done in 3D with the SAP2000 v.22 program. The problem being reviewed is the effect of the soft story on the mass participation ratio, fundamental period, seismic base shear, and drift limit.

The results of the analysis show that the mass participation ratio in the x and y directions of each building frame model has the same number of mode shapes. The longest fundamental period has the largest value on MRGSS2. The shortest fundamental period is the smallest value on MRGSS2. The seismic base shear forces in the x and y directions obtained the smallest value on MRGSS1. The drift limit in the x and y directions is the smallest value in MRGSS1.

Based on the theory of earthquake-resistant structure performance, the structure chosen for the x-direction is MRGSS1 because it is more dominant where the seismic base shear is the smallest and the drift limit is the smallest and the structure that is avoided for the x-direction is MRGSS2 because of the value of the largest seismic base shear, the largest drift limit. While the structure chosen for the y direction is MRGSS1 because it is more dominant where the seismic base shear is the smallest and the drift limit is the smallest and the structure that is avoided for the y direction is MRGSS2 because the value of the largest seismic base shear and is the largest of drift limit.

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