REDESIGN OF THE BRIDGE SUPERSTRUCTURE USING STEEL TRUSS ARCH STRUCTURE (THROUGH ARCH BRIDGE)

Abstract

A bridge is defined as a connecting facility for pedestrians and vehicles to facilitate crossings over highways, rivers, or valleys. Initially, this bridge utilized a prestressed concrete girder construction with a span length of 130 meters. In this study, the bridge design was developed into a steel arch system with the vehicle deck positioned below (through arch bridge). The planning process begins by explaining the background of the bridge type selection, objectives, and scope of discussion based on analysis referring to SNI regulations. The initial stage of planning is carried out through a preliminary design using steel material, with a span length of 130 meters and a width of 13 meters. Load calculations on the superstructure are conducted in the early stages. The design of the main structural elements includes longitudinal girders, transverse girders, and steel arch frames. Structural analysis is performed using SAP2000 software to ensure the strength of the structure and its connections. The bridge bearings are designed using pot bearings, adjusted according to the available specifications. The analysis results indicate that the vehicle deck slab has a thickness of 20 cm, the longitudinal girders use WF 500x200x10x16 profiles, the transverse girders use WF 900x300x16x28 profiles, and the primary upper structure frame utilizes BOX profiles tailored to structural needs. All calculation results are presented in standard-compliant technical drawings.