Abstract
Abstract Estimating the shear strength of Ultra-High-Performance Concrete (UHPC), with high compressive and tensile strengths, is complicated by many variables that affecting its behavior. Residual tensile stress (RTS) plays an important role in raising the efficiency of both types of resistance, especially shear strength due to the presence of steel fibers, which makes it difficult to quantify the residual tensile stress due to the different failure patterns of these fibers and the distribution mechanism within the concrete matrix. There is no study to date in assessing residual tensile stress of UHPC structural members of the variable section. Thirteen beams were selected as an experimental program to study six main variables in determining shear strength. Stirrups ratio, flexural reinforcement ratio, the volumetric fraction of steel fibers, geometry changing, existing openings along the longitudinal axis, and shear span to depth ratio. According to on Tests results, RTS is compatible with most of the global specifications.
Highlights
The non-prismatic beam, Fig. 1, is widely used in mid-rise buildings, bridges, and structures as well as its aesthetic advantage
The tensile force consisted of two parts, one was of the bar force and the second was the uniform pressure of the tensile zone from the neutral axis to extreme tensile fibers with an intensity of 0.4× !
To theoretically predict the type of failure, the thresholds are designed for both ultimate shear and flexural by ensuring that shear values are less than the flexural
Summary
The non-prismatic beam, Fig. 1, is widely used in mid-rise buildings, bridges, and structures as well as its aesthetic advantage. The presence of longitudinal openings plays an important role in reducing dead weights that contributes to increasing space and raising the efficiency of the structural member. The presence of steel fibers enhances the strength of the section and increases the ductility ratio during its structural behavior. Regarding resistance, it increases the bending resistance by a small percentage in terms of tensile force of fibers about the neutral axis while a very high increase in the shear resistance. The steel fibers act as a connecting bridge at both sides of the crack and generate many failure patterns that are difficult to estimate, but in general, the resistance greatly enhances.
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