Electronic Theses and Dissertation

ABSTRAK
Indonesia kerap mengalami bencana hidrometeorologi seperti angin kencang yang dapat merusak struktur bangunan sederhana. Rangka atap baja ringan, meskipun efisien dan mudah dipasang, rentan terhadap beban lateral akibat angin karena posisinya di elevasi tertinggi bangunan. Penelitian ini mengevaluasi kapasitas rangka atap tipe double fink terhadap beban angin menggunakan analisis pushover berbasis simulasi numerik di SAP2000, dengan tiga variasi sudut atap: 25°, 30°, dan 35°. Berdasarkan klasifikasi angin tropis, kecepatan 63–118 km/jam tergolong badai tropis (tropical storm), sedangkan 119–153 km/jam termasuk kategori angin topan tingkat 1 (hurricane category 1). Hasil simulasi menunjukkan: pada sudut 25°, struktur menahan gaya maksimum 53.67 kN di tiap titik gording saat salah satu batang mengalami kondisi CP (Collapse Prevention), setara tekanan 133.416 kN/m² atau 108.13 km/jam (badai tropis). Pada sudut 30°, struktur menahan 66.67 kN (164.965 kN/m²), setara 120.60 km/jam (kategori 1). Sementara itu, pada 35°, menahan 80 kN (199.738 kN/m²), setara 131.74 km/jam (kategori 1). Penelitian ini diharapkan menjadi acuan dalam mitigasi risiko kerusakan atap akibat angin ekstrem.
Kata kunci: beban angin, pushover, SAP2000, rangka baja ringan, deformasi plastis, kurva kapasitas

ABSTRACT Indonesia frequently experiences hydrometeorological disasters such as strong winds, which can damage simple building structures. Although lightweight steel roof trusses are efficient and easy to install, they are vulnerable to lateral wind loads due to their position at the highest elevation of a building. This study evaluates the capacity of double Fink-type steel roof trusses against wind loads using pushover analysis based on numerical simulations in SAP2000, with three roof slope variations: 25°, 30°, and 35°. Based on tropical wind classifications, wind speeds of 63–118 km/h are categorized as tropical storms, while 119–153 km/h fall into hurricane category 1. The simulation results show that at a 25° slope, the structure resists a maximum force of 53.67 kN at each purlin point when one of the truss members reaches the Collapse Prevention (CP) condition, equivalent to a wind pressure of 133.416 kN/m² or 108.13 km/h (tropical storm). At 30°, the structure resists 66.67 kN (164.965 kN/m²), equivalent to 120.60 km/h (category 1). At 35°, it resists 80 kN (199.738 kN/m²), equivalent to 131.74 km/h (category 1). This research is expected to serve as a reference for mitigating the risk of roof structural damage due to extreme wind events. Keywords: wind load, pushover, SAP2000, light steel truss, plastic hinge, capacity curve