Studi Komparatif Kinerja Seismik Gedung 13 Lantai RC-SW dan USPSW-CFST Berbasis Analisis Respons Spektrum di Surabaya
DOI:
https://doi.org/10.69688/juksit.v5i1.1.246Keywords:
Analisis Respons Spektrum, Concrete-Filled Steel Tube, Kinerja Seismik, Pondasi Tiang Pancang, Unstiffened, Steel Plate Shear WallAbstract
Bangunan bertingkat memerlukan sistem penahan gaya lateral yang mampu mengendalikan simpangan dan tetap efisien terhadap berat struktur. Penelitian membandingkan struktur eksisting gedung perkuliahan 13 lantai setinggi 56 m di Surabaya yang menggunakan portal momen beton bertulang dengan reinforced-concrete shear wall dan struktur modifikasi yang menggunakan USPSW dengan kolom CFST. Analisis dilakukan dengan pemodelan tiga dimensi dan respons spektrum sesuai SNI 1726:2019. Hasil analisis digunakan untuk memeriksa panel USPSW, elemen batas, sambungan, pondasi tiang, serta biaya material. Berbeda dengan penelitian terdahulu yang umumnya meninjau perilaku panel atau elemen secara terpisah, penelitian ini membandingkan respons struktur, kapasitas elemen utama, pondasi, dan biaya pada satu objek gedung. Hasil menunjukkan partisipasi massa kedua model lebih dari 99%. Periode fundamental turun dari 1,76 s menjadi 1,61 s dan berat model berkurang 28,15%. Simpangan maksimum arah Y turun 20,9%, sedangkan arah X naik 8,3% namun masih memenuhi batas izin. Pada model modifikasi tanpa shear wall, simpangan maksimum mencapai 64,34 mm pada arah X dan 54,59 mm pada arah Y, sedangkan setelah USPSW dipasang turun menjadi 24,21 mm dan 22,71 mm. Panel kritis menggunakan pelat 4,8 mm dengan rasio kebutuhan-kapasitas 0,72, sedangkan rasio interaksi EBV CFST sebesar 0,91. Pondasi modifikasi menggunakan spun pile D600 mm sepanjang 36 m dan memenuhi pemeriksaan yang dilakukan. Biaya struktur bawah turun 7,51%, tetapi biaya material total meningkat sekitar 160% dari Rp37,01 miliar menjadi Rp96,24 miliar. Dari hasil tersebut, USPSW-CFST dapat mengurangi berat struktur dan simpangan arah Y, tetapi belum memberikan hasil yang lebih baik pada seluruh parameter dan biaya.
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