Performance Analysis of Composite Steel I-Girder Bridge under Overloading Conditions

Munirul Hady; Khaidir Khaidir; Imransyah Idroes; Heru Pramanda

doi:10.70028/mssi.v1i1.99

Authors

Munirul Hady Department of Civil Engineering, Faculty of Engineering, Universitas Syiah Kuala, Banda Aceh, 23111, Indonesia Author
Khaidir Khaidir Department of Civil Engineering, Faculty of Engineering, Universitas Iskandar Muda, Banda Aceh, 23234, Indonesia Author
Imransyah Idroes Department of Civil Engineering, Faculty of Engineering, Universitas Iskandar Muda, Banda Aceh, 23234, Indonesia Author
Heru Pramanda Department of Civil Engineering, Faculty of Engineering, Universitas Iskandar Muda, Banda Aceh, 23234, Indonesia Author

DOI:

https://doi.org/10.70028/mssi.v1i1.99

Keywords:

Composite Bridge, Structural Capacity, Deflection, Serviceability, Steel Girders

Abstract

Composite bridges are generally a combination of steel girders (plate girders) and reinforced concrete, where steel acts as the primary load-resisting element, while reinforced concrete serves as the deck slab. This structural system requires careful consideration of strength, durability, and economic efficiency aspects. Along with population growth, economic development, and increasing traffic intensity and loading, the performance of existing bridges may deteriorate over time, necessitating a thorough evaluation of their load-carrying capacity. The main issue addressed in this study is whether the originally designed bridge is still capable of accommodating increasing loads or requires structural strengthening. The novelty of this research lies in the capacity and deflection analysis of a composite bridge using a staged loading approach that considers variations in vehicle numbers and traffic conditions up to critical states. This study aims to evaluate the structural capacity and deflection behavior of a composite steel I-girder bridge. The adopted method is the Load and Resistance Factor Design (LRFD) approach, supported by numerical modeling using SAP2000 software and based on loading provisions specified in SNI 1725:2016. The analysis results show that under the 8-truck loading condition, the capacity ratio reaches 1.052 (>1.00), indicating an unsafe condition. The deflection value of 21.2495 mm (<25 mm) still satisfies the serviceability limit; however, some girder elements fail to meet safety requirements. The maximum axial force, shear force, and bending moment are 1890.717 kN (tension), 97.424 kN, and 690.3965 kN·m, respectively.

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