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http://dx.doi.org/10.7734/COSEIK.2022.35.2.73

Numerical Simulation of 72m-Long Ultra High Performance Concrete Pre-Stressed Box Girder  

Mai, Viet-Chinh (Department of Civil Engineering, Kumoh National Institute of Technology)
Han, Sang Mook (Department of Civil Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Computational Structural Engineering Institute of Korea / v.35, no.2, 2022 , pp. 73-82 More about this Journal
Abstract
The study presents a three-dimensional approach to simulate the nonlinear behavior of a 72 m long Ultra High Performance Fiber Reinforced Concrete (UHPFRC) pre-stressed box girder for a pedestrian bridge in Busan, South Korea. The concrete damage plasticity (CDP) model is adopted to model the non-linear behavior of the UHPFRC material, in which the material properties are obtained from uniaxial compressive and tensile tests. The simulation model based on the proposed stress-strain curve is validated by the results of four-point bending model tests of a 50 m UHPFRC pre-stressed box girder. The results from the simulation models agree with the experimental observations and predict the flexural behavior of the 50 m UHPFRC pre-stressed box girder accurately. Afterward, the validated model is utilized to investigate the flexural behavior of the 72 m UHPFRC pre-stressed box girder. Here, the load-deflection curve, stress status of the girder at various load levels, and connection details is analyzed. The load-deflection curve is also compared with design load to demonstrate the great benefit of the slender UHPFRC box girder. The obtained results demonstrate the applicability of the nonlinear finite element method as an appropriate option to analyze the flexural behavior of pre-stressed long-span girders.
Keywords
ultra-high performance fiber reinforced concrete(UHPFRC); pre-stressed girder; box girder; shear key; segmental girder;
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