Radifan, Fariz Dwi (2025) Modifikasi Struktur Gedung Apartemen Samesta Mahata Serpong Tower A Menggunakan Struktur Baja Komposit Dengan Sistem Buckling Restrained Braced Frames (BRBF). Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Indonesia merupakan negara yang rawan gempa bumi, khususnya di wilayah seismic gap, sehingga perancangan bangunan tahan gempa menjadi sangat penting. Penelitian ini memfokuskan pada modifikasi struktur gedung Apartemen Samesta Mahata Serpong Tower A yang awalnya menggunakan sistem concrete shearwall dan beton bertulang, menjadi struktur baja komposit dengan sistem Buckling-Restrained Braced Frames (BRBF) dan kolom komposit Concrete-filled Steel Tube (CFT). Gedung setinggi 32 lantai ini menggunakan kolom komposit berukuran CFT 800, 700, 600, dan 500 mm, serta balok induk berukuran WF 600×300×12×20, WF 500×200×10×16 dan WF 400×200×8×13. Sistem BRBF dengan konfigurasi Chevron dan dimensi penampang 10 in², 8 in², dan 5 in² untuk meningkatkan kinerja seismik dengan stabilitas lebih baik dan efisiensi dalam penyerapan energi gempa. Periode struktur tercatat sebesar 2,77 detik untuk arah ragam sumbu X sebagai ragam pertama dan 2,64 detik untuk arah ragam sumbu Y sebagai ragam kedua, telah menunjukkan respons dinamis yang sesuai. Struktur bawah menggunakan kolom pedestal berukuran 1100×1100 mm dan pondasi berupa 5 jenis pilecap dengan jumlah pile bervariasi antara 2 hingga 12 buah, menggunakan spun pile berdiameter 600 dan 800 mm dengan kedalaman 16 meter, memberikan dukungan fondasi yang kuat. Hasil perhitungan menunjukkan bahwa modifikasi struktur ini mampu memenuhi persyaratan kekuatan dan stabilitas terhadap beban seismik. Tugas akhir ini memberikan kontribusi penting dalam pengembangan desain struktur gedung tahan gempa di Indonesia, dengan penerapan sistem BRBF dan baja komposit yang efisien serta konstruksi yang lebih praktis. Seluruh hasil perhitungan dari tugas akhir ini juga dituangkan secara lengkap ke dalam gambar teknik.
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Indonesia is a country highly prone to earthquakes, particularly in seismic gap regions, making the design of earthquake-resistant buildings crucial to ensure structural safety and resilience. This study focuses on the modification of the structural system of the Samesta Mahata Serpong Apartment Tower A, originally designed with a concrete shear wall system and reinforced concrete materials, into a composite steel structure incorporating Buckling-Restrained Braced Frames (BRBF) and Concrete-filled Steel Tube (CFT) composite columns. The 32-story building is retrofitted using CFT composite columns with varying sizes of 800, 700, 600, and 500 mm, providing optimal strength and stiffness against vertical and lateral loads. The main beams utilize WF 600×300×12×20, WF 500×200×10×16 and WF 400×200×8×13 profiles, designed to efficiently distribute loads throughout the structure. The BRBF system, configured in a chevron pattern with cross-sectional areas of 10 in², 8 in², and 5 in², is engineered to enhance seismic performance by effectively dissipating earthquake energy through a nondestructive damping mechanism, thereby reducing the risk of structural failure. Dynamic analysis indicates a fundamental period of 2,77 seconds along X-axes representing the first mode on structure and 2,64 seconds along Y-axes for the second mode of strucutre, reflecting a stable dynamic response consistent with the seismic characteristics of the region. The foundation system comprises pedestal columns measuring 1100×1100 mm, supported by five types of pile caps with pile quantities ranging from 2 to 12, utilizing spun piles with an 600 and 800 mm diameter, 16-meter depth to ensure adequate soil bearing capacity and foundation stability. The structural calculations demonstrate that the modification employing BRBF and composite steel systems meets the strength, stiffness, and stability requirements under seismic loading as per Indonesian National Standards (SNI), while also offering advantages in construction efficiency and cost-effectiveness. This research contributes significantly to advancing earthquake-resistant building design methodologies in Indonesia, particularly through the innovative and effective application of composite steel structures and BRBF systems. All calculation results from this thesis are also comprehensively presented in technical drawings.
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