Sanuaji, Freddy Restandi (2022) Pengaruh Rasio Panjang-Lebar (L/B) pada Bangunan dengan First Soft Story terhadap Periode Getaran, Rasio Partisipasi Massa, Gaya Geser Dasar, dan Simpangan Antar Lantai dengan Analisis Gempa Respon Spektrum Berdasarkan SNI 1726-2019. Undergraduate thesis, Fakultas Teknik Universitas Merdeka Malang.

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Abstract

The current development of various building developments can result inlimited land area, thus making the need for land functions narrower. The limitedland area can cause irregularities in the building vertically and horizontally. One ofthe vertical irregularities in the structure is the influence of the first soft story, whilethe horizontal irregularity is the shape of the building that is too long so that thebuilding has a rectangular plan, this can allow for deformation of the ground that isnot uniform and will affect the center of mass so that it cannot distribute the load earthquake evenly. Therefore, the structure needs to be reviewed regarding theeffect of the ratio of the length to the width of the building with the first soft story.
The modeled structure is a 10-storey building that has a variation of the length-width ratio (L/B) in the building, namely L/B = 3 (MD-LB3), L/B = 2 (MDLB2),L/B=5(MD-LB5),andL/B=7(MD-LB7).The seismic force analysis uses dynamic analysis of the response spectrum based on SNI 1726-2019 with the help of SAP 2000.The problem being reviewed is how the effect of the length-widthratio (L/B) in a building with a first soft story on the behavior of the building structure when subjected to earthquake loads and gravity loads based on SNI 17262019,SNI 1727-2013, and SNI 1727-1989F. The results of the analysis will be evaluated on each structural model to the value of the period of vibration, the basic shear force, the mass participation ratio, and the drift story.
Based on the the ory of structural performance, the structure is said to be saferif it meets the requirements where the value of the largest structural vibration period(+), the smallest basic shear force (-), and the smallest drift story (-). In the x direction structure model, the value of the largest vibration periodis in the MDLB 5 model, the smallest basic shear force value is in the MD-LB2 model, the smallest value of the drift story is in the MD-LB2 model. The x-direction building structure model that can be selected is the MD-LB2 model because it is more dominant in meeting the theoretical requirements. The building structure model thatis avoided is the MD-LB7 model because it is inversely proportional to the theory. Whereas in the y-direction structure model, the value of the largest vibration periodis in the MD-LB5 model, the smallest basic shear force value is in the MD-LB2 model, the smallest value of drift story is in the MD-LB2 model. The y-direction building structure model that can be selected is the MD-LB2 model because it is more dominant in meeting the theoretical requirements. The building structure model that is avoided is the MD-LB7 model because it is inversely proportional to the theory.

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