The optimized design of dog-bones for tensile test of ultra-high performance concrete

Author(s) : J. Yang, J. Su, B. Chen, X. Luo, X. Shen
Paper category : Proceedings
Book title : UHPFRC 2017 Designing and Building with UHPFRC: New large-scale implementations, recent technical advances, experience and standards
Editor(s) : F. Toutlemonde & J. ResplendinoT.Ch.
Print-ISBN : 978-2-35158-166-7
e-ISBN : 978-2-35158-167-4
Publisher : RILEM Publications SARL
Publication year : 2017
Pages: 175 - 182
Total Pages : 8
Language : English

Abstract: Sustained post-cracking tensile resistance is a fundamental mechanical property of ultra-high performance concrete (UHPC). The uniaxial tensile test is a very sensitive and difficult test to conduct. The research can improve the success rate of direct tensile test for UHPC by designing special dog-bone specimens. Then dog-bone specimens have unique advantages. When the cross-sectional area near the ends of the specimens is increased, the boundary stresses will be reduced and bond failure is generally avoided. The failure should occur in the prismatic part of the specimen where, in theory, the shape effects are absent. The tensile stress in the effective test area is the key to the success of the uniaxial direct tension test. So, the effects of a set of non-dimensional geometric parameters on the stress distribution were numerically investigated. A total of 125 dog-bones specimens were analyzed using the non-dimensional parameters, and an equation was proposed to assess the tensile stress in effective test area. Based on the stress distribution in the effective test area, an optimized design is proposed for the dog-bone shape to improve the success rate of the uniaxial tensile test. Five dog-bone specimens were tested for verification of the optimized dog-bone shape that can.

Online publication : 2017
Publication type : full_text
Public price (Euros) : 0.00