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The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title: Uniaxial and triaxial behavior of high strength concrete with and without steel fibers
Author: Lu, Xiaobin
View Online: njit-etd2005-033
(xxii, 184 pages ~ 6.8 MB pdf)
Department: Department of Civil and Environmental Engineering
Degree: Doctor of Philosophy
Program: Civil Engineering
Document Type: Dissertation
Advisory Committee: Hsu, C.T. Thomas (Committee chair)
Spillers, William R. (Committee member)
Meegoda, Jay N. (Committee member)
Schuring, John R. (Committee member)
Cleary, Douglas B. (Committee member)
Date: 2005-01
Keywords: High strength concrete
Triaxial compression
Octahedral shear stress
Engineering octahedral shear strain
Incremental constitutive model
Poisson's ratio
Availability: Unrestricted
Abstract:

This study first presents an extensive experimental research program on the true uniaxial and triaxial compression behavior for both high strength concrete (HSC) and steel fiber reinforced high strength concrete (SFHSC). The experimental study mainly focuses on the octahedral shear stress strain relationship of those two types of concrete, which is adopted as the basis to develop a new incremental constitutive model. Emphasis is also put on the investigation of the variation of tangent Poisson's ratio under not only uniaxial but also triaxial stress conditions. The effect of cyclic loading on this parameter is also addressed.

According to this research, under triaxial compression, there is no apparent advantage of steel fiber reinforced high strength concrete (SFHSC) over high strength concrete (HSC) in terms of triaxial strength, ductility and stress ~ strain behavior. The compressive meridians and the peak octahedral shear stress (ζoctp) versus peak octahedral shear strain (ϒoctp) relationships for the two types of concrete can be virtually expressed by a single expression respectively.

Unlike most of the previous incremental constitutive models, the proposed new model utilizes the experimentally acquired octahedral shear stress (ζotcp) octahedral shear strain (ϒoct) relationship instead of the fictitious concept of "equivalent uniaxial strain" to locate the peak point of the triaxial stress ~ strain curve, which ensures its capability of simulating the whole load ~ deformation process for both HSC and SFHSC, including the descending branch in the stress ~ strain curve. The results from the model analysis comply with the experimental data fairly well under moderate confining pressures.


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