Mubarok, M. Nauval Kharis (2024) Studi Efektivitas Penambahan Fluid Viscous Damper (FVD) pada Gedung Bertingkat dengan Denah Tidak Beraturan untuk Meningkatkan Kinerja Seismik. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Sekarang, banyak gedung didesain dengan denah asimetris sehingga rawan terjadi torsi dan berpotensi runtuh saat gempa. Salah satu inovasi untuk mengatasinya adalah dengan menambahkan peredam gempa, seperti fluid viscous damper (FVD). Penelitian ini akan mempelajari tentang efektivitas penambahan FVD dalam memperbaiki kinerja struktur tidak beraturan horizontal dalam merespons gempa. Denah struktur yang digunakan berbentuk L. Pengujian dilakukan terhadap tiga sampel dengan variasi lokasi FVD. Analisis menggunakan program bantu finite element. Analisis dilakukan dengan metode linear respons spektrum saat proses desain. Fungsi respons spektrum yang dipakai adalah Kota Padang. Kemudian, dilakukan evaluasi struktur dengan metode nonlinear time history analysis (NLTHA). Hasil pengujian menunjukkan bahwa reduksi periode struktur arah X model FVD1, FVD2, dan FVD3 berturut-turut adalah 12,61%, 11,36%, dan 12,97% serta arah Y adalah 13,52%, 13,82%, dan 13,26%. Reduksi simpangan antarlantai arah X model FVD1, FVD2, dan FVD3 berturut-turut adalah 53,41%, 54,92%, dan 54,81% serta arah Y adalah 46,49%, 51,90%, dan 48,55%. Reduksi gaya geser dasar arah X model FVD1, FVD2, dan FVD3 berturut-turut adalah 23,90%, 27,98%, 26,74% serta arah Y adalah 21,22%, 25,84%, 24,58%. Rasio Δmax/Δavg arah X pada FVD1, FVD2, dan FVD3 berturut-turut sebesar 118,91%, 117,83%, dan 99,84% dari MRF serta arah Y sebesar 71,44%, 71,27%, dan 66,59% dari MRF. Reduksi percepatan atap arah X pada model FVD1, FVD2, dan FVD3 berturut-turut sebesar 13%, 10%, dan 13% serta arah Y sebesar 26%, 22%, dan 33%. Rata-rata disipasi energi gempa arah X pada model FVD1, FVD2, dan FVD3 berturut-turut sebesar 43%, 44%, dan 42% serta arah Y sebesar 41%, 38%, dan 42%. Penambahan FVD juga mampu menurunkan tingkat kerusakan sendi plastis. Konfigurasi yang paling efektif adalah model FVD1. Sambungan FVD menggunakan pelat ASTM A36 setebal 50mm. FVD dipasang ke pelat dengan sendi baja ASTM A325 berdiameter 180mm. Sedangkan pelat disambung dengan las sudut 30mm bermutu E70XX di kedua sisinya.
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Currently, many buildings are designed with asymmetrical layouts, making them susceptible to torsion and potential collapse during earthquakes. One innovation to address this issue is the addition of seismic dampers, such as fluid viscous dampers (FVD). This study investigates the effectiveness of adding FVDs in improving the performance of horizontally irregular structures in response to seismic events. The structural layout used is L-shaped. Testing was conducted on three samples with varying FVD locations. Finite element software was utilized for the analysis, employing the linear response spectrum method during the design process, with the response spectrum function from Kota Padang. Subsequently, the structures were evaluated using the nonlinear time history analysis (NLTHA) method. The test results indicated that the reduction in the structural period in the X-direction for FVD1, FVD2, and FVD3 models were 12.61%, 11.36%, and 12.97% respectively, and in the Y-direction, they were 13.52%, 13.82%, and 13.26%. The reduction in inter-story drift in the X-direction for FVD1, FVD2, and FVD3 models were 53.41%, 54.92%, and 54.81% respectively, and in the Y-direction, they were 46.49%, 51.90%, and 48.55%. The reduction in base shear forces in the X-direction for FVD1, FVD2, and FVD3 models were 23.90%, 27.98%, and 26.74% respectively, and in the Y-direction, they were 21.22%, 25.84%, and 24.58%. The Δmax/Δavg ratio in the X-direction for FVD1, FVD2, and FVD3 models were 118.91%, 117.83%, and 99.84% respectively from the MRF, and in the Y-direction, they were 71.44%, 71.27%, and 66.59% from the MRF. The reduction in roof acceleration in the X-direction for FVD1, FVD2, and FVD3 models were 13%, 10%, and 13% respectively, and in the Y-direction, they were 26%, 22%, and 33%. The average seismic energy dissipation in the X-direction for FVD1, FVD2, and FVD3 models were 43%, 44%, and 42% respectively, and in the Y-direction, they were 41%, 38%, and 42%. Adding FVDs also reduced the level of plastic hinge damage. The most effective configuration was the FVD1 model. The FVD connection used a 50mm thick ASTM A36 plate, attached to the plate with 180mm diameter ASTM A325 steel joints, and the plate was welded with a 30mm E70XX grade fillet weld on both sides.
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