PERBANDINGAN STRUKTUR ATAS JEMBATAN RANGKA BAJA MENGGUNAKAN TIPE WARREN TRUSS, K-TRUSS, DAN RANGKA AUSTRALIA PADA JEMBATAN SOKONG DI LOMBOK UTARA

Sokong Bridge is the main road link in North Lombok Regency with a span of 60 meters and a width of 10 meters. The existence of the bridge is certainly profitable because the travel time will be faster and easier. Steel frame bridge is a type of bridge that produces a stronger bridge structure, so it is necessary to discuss to determine the type that matches the criteria of the planned bridge. The planned frame-type bridges are Warren Truss, K-Truss, and Australian Frame types with spans of 30 meters and 60 meters using falsework, and cantilever assembly methods. To find out the comparison of the design of each type of main frame structure planned to the effectiveness of the bridge span, an analysis of the 2-dimensional main frame structure is carried out using the StaadPro V8i auxiliary program to find the value of the deflection and rigidity that works on the bridge structure. The smallest deflection is 14,526 mm which occurs in the K-Truss type with a span of 30 meters. The greatest stiffness on the bridge occurs in the 30 meter span of the K-Truss type with a stiffness value of 894,454 t/m. The ratio of efficiency that occurs on bridges based on the relationship between deflection and structure weight indicates that efficient bridges occur in the Warren Truss type which has a safe deflection value with the smallest structural weight. With the shortest duration of the assembly method on a span of 30 meters using the Cantilever method