Helix Type Steel Structure Bridge Design the Path Between Notog-Kebasen Bh.1458

Abstract

The railway path between Notog and Kebasen, specifically at bridge identifier Bh.1458, presents significant topographical and complex geometric challenges, requiring a specialized structural solution that deviates from conventional bridge design. This study focuses on the design and structural analysis of a Helix Type Steel Structure for this railway bridge, proposed as an innovative solution to accommodate the difficult alignment and site constraints. The design methodology employs a 3D structural model analyzed using the Finite Element Method (FEM). The analysis is conducted based on Indonesian railway bridge loading standards (PM JKA), encompassing dead loads, live loads (R-series), braking and traction forces, as well as seismic and wind loads according to the latest SNI codes. The design evaluates the performance of the helical steel truss system, focusing on its capacity to manage the complex torsional and bending stresses induced by the curved geometry and dynamic railway loading. The analysis verifies that all primary and secondary structural members, as well as critical connections, satisfy the code requirements for strength and serviceability, including stress, deflection, and stability limits. This paper concludes that the Helix Type Steel Structure is a feasible, safe, and efficient engineering solution for the Bh.1458 bridge, effectively resolving the site's unique geometric demands while ensuring full structural integrity.