Studi Perbandingan Berat Struktur Baja Gable Frame dengan Rafter Sistem Truss terhadap Penampang Tapered pada Bangunan Packaging Plant

Abstract

Steel is a very important material in modern industry and construction. With its advantages, steel material is often used in structures such as gable frames where large internal space is needed. With a large internal space, the use of cross-sections in gable frame structures must be able to overcome the deflection that occurs. One use of cross-sections that can overcome deflection is a tapered cross-section which has the advantage of overcoming deflection with a relatively lighter tonnage. Apart from the use of tapered cross-sections, the truss system can be an alternative in overcoming deflection that occurs in gable frame structures. The configuration of the truss can overcome deflection by using a relatively smaller cross-section so that it can maintain the economy of the structure. This study explores the use of truss systems in gable frame structures, especially in the context of the Packaging Plant building located in the Sei Mangkei Special Economic Zone. This study compares the weight of gable frame structures using truss systems to the use of tapered crosssections. Data obtained from the project include working drawings, material specifications, and loading data. The data obtained was then processed through preliminary design, load calculation with SNI reference, structural analysis using the MIDAS Gen 2023 application, cross-section design in accordance with applicable regulations, and produced a comparative study of the weight of structural elements. The results of the study are presented in the form of a comparison of the weight of the structure, stress ratio, deflection that occurs, then an evaluation of the comparative weight of the structure between the gable frame truss configuration and the initial design was carried out. This study shows that the truss configuration has a less efficient design compared to the initial design. With a total weight of 144,200 kg, the truss system has an inefficiency of 32% compared to the initial design. The truss configuration made on the rafter gable frame causes the column cross-section to use a prismatic cross-section. This causes an increase in tonnage to the entire truss system structure.