International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 07 | July 2023
p-ISSN: 2395-0072
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STRUCTURAL BEHAVIOUR OF CURVED BOX GIRDER BRIDGE Shivani S. Kolhe1, Dr. M. R. Shiyekar2 1M- Tech student, Applied Mechanics Department, Govt College of Engineering, Karad 2Professor, Applied Mechanics Department, Govt College of Engineering, Karad
----------------------------------------------------------------------***---------------------------------------------------------------------Abstract: Curved box girder bridge is extensively used in metro rail bridges. It is vital to build bridge constructions with curved plans as horizontally curved alignments for railway bridges and urban interchanges are becoming more common. Torsional moments are mostly present because of the influence of the box girders' horizontal curvature. This study's primary goal is to evaluate the analytical results of horizontally curved box girder bridges having different parameters. In this paper, the numerous models for curved box girders are analyzed using MIDAS software for different parameters such as span lengths, radius of curvature, and loadings. The results obtained are in terms of shear force, bending moment, torsional moment, and midspan deflection. It is observed from the results that there is no significant change in bending moment and shear forces for each radius of curvature but with increasing Radius of curvature there is an appreciable decrease in the value of torsional moment.
Keywords:- Curved box girders; prestressed concrete; Torsional behaviour; mid-span deflections; finite element method, MIDAS Software.
1. INTRODUCTION Curved box girder bridge is used in metro rail bridges and highway bridges. It is made up of structural steel, reinforced concrete, or pre-stressed concrete and the box is a single-cell, double-cell, multi-cell, and multi-spine with rectangular, circular, or trapezoidal in cross-section. In box girder bridges the girders is in the form of hollow box section. It can also be used for various purposes such as electric supply lines, telephone cables, water supply lines, sewers, etc. and the box girder section has the additional advantage that it is lighter in weight. In the current specifications of the Indian railway code, no separate guideline is available for the curved box girder bridge except for consideration of torsional moment. There are various methods available for the analysis of box girders such as the orthotropic plate theory method, folded plate method, grillage analogy method, finite strip method, finite element method, computer programming & experimental studies. H. Zuwei et al.[1] used grillage analogy method for multi-cell box girder with transverse slope. B. Al-Masoud et. al.[2] used folded plate method for the analysis of roofs and cellular bridges and compare the result with various methods. W. Feng et. al.[3] developed finite strip method to analyze the Single Cell Curved Box Girder Bases. C. P. Heins et al.[4] developed a program for the analysis of simple or multi-span composite or non-composite steel box girder bridges R.Shreedhar et. al.[5] performed a Comparative study of the Grillage method and FEM method of the RCC Bridge Deck. K. Shushkewich [6] has developed an approximate analysis of a concrete box girder bridge by using a folded plate, finite strip, and finite element method by using some simple membrane equations. N. Gupta et. al.[7] Analyzed RCC curved box girder bridges by using a finite element approach. S. Gajera et. al.[8] performed a Parametric Study of Horizontally Curved PreStressed Concrete Continuous Box Girder Bridges. A. Sarode et. al.[9] analyzed the Torsional Behavior and Constancy for Horizontally Curved Box Girders. D. B. Kulkarni et. al.[10] performed Dynamic analysis of RCC curved beam using the software. R. Jain et. al.[11] performed Stability analysis and Torsional Behavior of Horizontally Curved Box Girders. K. M. Sennah et. al.[12] investigated approximate and conservative methods for the analysis and design of straight and curved box girder bridges. A. S. Khairmode[13] Analyzed the Prestressed Concrete Multi-Cell Box Girder Curved Bridge. M. Pathak [14] used SAP software for presenting several behaviours for horizontally curved RCC box bridges. R. Jaiswal et. al.[15]Analyzed the elevated Metro Bridge as per IRC 70R loading and it can be done by using STAAD.Pro software. In this paper, numerous models are analyzed for different parameters such as radius of curvature, span length, and various loadings. Torsional moments predominate because of the horizontal curvature of the box girders. Also due to loading, more deflections are occurred at mid-span. Hence the flexural behaviour, torsional behaviour, stability, and mid-span deflections of the curved box girders of different parameters are discussed in this paper.
2. SCOPE OF THE STUDY a) To analyze the three-dimensional finite element models of the Box girder for different parameters such as span length, the radius of curvature, depth of the box girder under Metro railway loadings
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