Research to propose a formula to calculate bending resistance for prestressed bridge beams using Ultra-High Performance Concrete (UHPC) in Vietnam

Abstract

This paper presents the results of research on the formula for determining the bending resistance of prestressed bridge girders using ultra-high performance concrete (UHPC) with I and T sections, made from material components available in Vietnam. The formula for calculating bending resistance is built based on converting an equivalent rectangular stress distribution chart for both tensile and compressive stress regions. The stress-strain relationship of UHPC is built based on experimental data tested from standard samples at the construction materials laboratory of Hanoi University of Civil Engineering. The results of calculating the bending resistance of pre-tensioned UHPC bridge girders are verified with the experimental results of several studies published recently. The comparison results show that the calculation of bending resistance according to the research formula has a difference of less than 5% compared to the published experimental results.

Keywords: "UHPC"; prestressed girder; bridges structure; flexural behavior.