EVALUASI KINERJA SEISMIK PADA STRUKTUR GEDUNG RUMAH SAKIT PENDIDIKAN UNIVERSITAS INDONESIA DENGAN METODE ANALISIS PUSHOVER BERDASARKAN ATC 40

Abstract

Abstrak: Gedung Rumah Sakit Pendidikan Universitas Indonesia direncanakan harus bisa menahan beban gempa, untuk mengkaji ulang dilakukan pengukuran kinerja struktur bangunan menggunakan metode analisis pushover yang sesuai SNI 1726-2002 dan SNI 1726-2012. Penggunaan metode analisis pushover untuk mengetahui tingkatan kinerja gedung berdasarkan performance point yang digunakan untuk mengevaluasi kinerja seismik struktur gedung sesuai dengan ATC-40 dan berapa batas maksimum rasio drift atap dengan software ETABS V9.07. Parameter untuk analisis pushover zona gempa wilayah 4, tanah keras, diantaranya Tc = 0,5; Ao (Ca) = 0,24; Ar (Cv) = 0,30; dan C (Ar/Tc) = 0,6, massa (m), kekakuan struktur (k), redaman (c), dan waktu getar alami struktur (t). Hasil analisis pushover yang dihasilkan pada permodelan gedung didapat nilai Vt=2932,433 ton > Vy=294,133 ton. Nilai redaman efektif (β_eff) yang didapat sebesar 15,6%. Rasio drift dengan software ETABS V9.07 diperoleh maksimum total drift sumbu-x sebesar 0,00399 meter sedangkan maksimum in-elastik drift adalah 0,00327 meter dan sumbu-y sebesar 0,000407 meter serta maksimum in-elastik drift 0,000316 meter. Berdasarkan batasan rasio drift atap menurut ATC-40 hasil perhitungan tersebut menunjukan bahwa gedung yang ditinjau termasuk dalam level kinerja Immediate Occupancy (IO), berarti bila terjadi gempa gedung tidak mengalami kerusakan struktural dan non struktural sehingga bangunan tersebut tetap aman digunakan.

Kata Kunci: kinerja seismic Gedung, analisis pushover, ATC-40, performance point, total drift.

Abstract: Educational Hospital building of Universitas Indonesia Depok city, is planned to be able to withstand earthquake loads, the building structure performance reviewed using the pushover analysis method according to SNI 1726-2002 and SNI 1726-2012. The use of pushover analysis method to determine the level of building performance based on the performance point is used to evaluate the seismic performance of the building structure according to ATC-40 and the maximum limit of the roof drift ratio with ETABS V9.07 software. Parameters for pushover analysis for earthquake zone area 4, hard soil, including T_c = 0.5; A_o (C_a) = 0.24; A_r (C_v) = 0.30; and C (A_r / T_c) = 0.6, mass (m), structural stiffness (k), damping (c), and natural vibration time of the structure (t). The results of the pushover analysis generated in the building modeling obtained V_t = 2932,433 tonnes> V_y = 294,133 tonnes. The effective damping value (βeff) obtained is 15.6%. The drift ratio with ETABS V9.07 software obtained a maximum total x-axis drift of 0.00399 meters, while the maximum in-elastic drift is 0.00327 meters and the y-axis is 0.000407 meters and the maximum in-elastic drift is 0.000316 meters. Based on the limit of the roof drift ratio according to ATC-40, the calculation results show that the building being categorized in the Immediate Occupancy (IO) performance level, meaning that if an earthquake occurs the building does not experience structural and non-structural damage so that the building remains safe to use.

Keywords: building seismic performance, pushover analysis, ATC-40, performance point, total drift.