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Abstract
Live load distribution factors among the girders in a precast I-girder bridge have been studied. For this purpose, we consider a three-dimensional single-span simply supported bridge model in Finite Element Method. The live loads assigned for the bridge model is class 70R and class A from IRC code and HL-93M truck plus lane loading from AASHTO code for a three lane bridge. The design of the bridge and structural analysis has been done by using the computer software CSI Bridge v16.0. The aim of the present work is to find live load distribution factor (LLDF) for the displacement, bending moment and vertical shear force in different girders using FEA. LLDFs are also calculated by analytical methods using expansion in harmonics and by spring analogy. Analytical results have been compared with those calculated from FEM analysis. The results revealed that variation of LLDF in different girders is more in case of AASHTO loading compared to IRC loading. Comparison of FEM values and analytical values for LLDF shows good agreement between analytical and numerical techniques. The effect of cross girder spacing on LLDF has been examined.
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Details
1 Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati- 781039 (India