New method for uniaxial tensile test of UHPFRC

Abstract

In this study, we investigated the direct tensile test method of ultra-high performance fiber reinforced concrete. Proposed three evaluation indexes:Variation in the principal tensile stress rate β, uniformity of principal tensile stress η, and relative length of isostress area γ to evaluate the stress characteristics of specimens. Based on the stress analysis of the specimen, studied the influence of specimen shape, size and loading mode on the evaluation index of force characteristics, and designs a new UHPFRC-axis pull specimen test method for the goal of relieving stress concentration, and verifies the effectiveness of the new method. It is found that, the new specimen has a more random damage location and a more uniform stress distribution in the tensile test, and the success rate of testing the tensile strength after local reinforcement reaches 100%.