Perbandingan Kinerja Struktur Gedung Baja 8 Lantai Tanpa Bresing dan dengan Bresing Menggunakan Metode Pushover Analysis
Abstract
Abstrak
Indonesia merupakan kawasan yang terletak di area gempa tinggi dimanamana hampir setiap harinya ada catatan gempa yang banyak terjadi sesuai laporan BMKG. Hal ini menunjukkan bahwasanya sikap dalam pembangunan Gedung yang berada di Indonesia ini sangat penting untuk melalui proses perhitungan yang meninjau beban gempa. Gedung dengan struktur baja sangat efisien untuk memikul beban gempa. Profil baja yang memiliki daktilitas tinggi diharapkan dapat mengatasi permasalahan gedung tahan gempa yang ada di Indonesia meskipun harganya yang mahal, namun dapat dipastikan struktur gedung dengan menggunakan profil baja dapat digunakan untuk merancang Gedung tahan Gempa. Dalam studi ini akan membahas tentang perbandingan struktur gedung baja menggunakan bresing X yang mana dalam kasusnya dengan analisa gempa Pushover Analysis dan sesuai dengan aturan SNI 7860-2020. Berdasarkan hasil analisis yang dilakukan, gedung dengan penggunaan bresing X (Model 2) lebih stabil apabila menerima beban lateral dibandingkan gedung tanpa Bressing (Model 1). Hal ini dapat dilihat dari parameter yang diperoleh yaitu nilai simpangan (drift) pada model 2 sebesar 16,467 mm dengan perioda struktur 0,226 detik dimana nilai ini lebih kecil dibandingkan dengan struktur Gedung tanpa bresing (Model 1) yaitu sebesar 16,588 mm dan perioda struktur 0,356 detik. Sementara itu hasil analisis level kinerja dengan menggunakan Metode Pushover Analysis FEMA 356 baik arah X maupun arah Y pada kedua permodelan struktur menunjukan hasil level kinerja yang sama yaitu Immediate Occupancy (IO).
Abstract
Indonesia is an area that is located in a high earthquake area where almost every day there are many earthquake records that occur according to the BMKG report. This shows that the attitude in building construction in Indonesia is very important to go through a calculation process that reviews earthquake loads. Buildings with steel structures are very efficient in carrying earthquake loads. Steel profiles that have high ductility are expected to be able to overcome the problems of earthquake-resistant buildings in Indonesia even though they are expensive, but it is certain that building structures using steel profiles can be used to design earthquake-resistant buildings. In this study, we will discuss the comparison of steel building structures using bracing X which in this case is the Pushover Analysis earthquake and according to the lates SNI 7860-2020 rules. Based on the results of the analysis conducted, buildings with the use of bresing X (Model 2) are more stable when receiving lateral loads than buildings without Bressing (Model 1).This can be seen from the parameters obtained, namely the drift value in model 2 of 16,467 mm with a structure period of 0.226 seconds where this value is smaller than the structure of the building without bresing (Model 1) which is 16.588 mm and the structure period is 0.356 seconds.Meanwhile, the results of performance level analysis using FEMA 356 Pushover Analysis Method both X direction and Y direction in both structure modeling showed the same performance level results, namely Immediate Occupancy (IO).
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