Behavior of a high-strength concrete model subjected to biaxial compression
Behavior of a high-strength concrete model subjected to biaxial compression

Author: Jon Charles Herrin

Publisher:

Published: 1982

Total Pages: 164

ISBN-13:

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The main purpose of the research project reported herein was to determine the stress-strain behavior, ultimate strength, and failure mechanism of high-strength concrete subjected to biaxial compression. Model concrete plate specimens, composed of nine aggregate discs embedded in a mortar matrix, were used. Three different strength and elastic properties were used in order to determine the effects of material properties on the behavior of high-strength concrete subjected to biaxial compression. The plate specimens were tested using four biaxial stress ratios: 0 (uniaxial), 02, 0.5, and 1.0. Deformations in both the major and minor principal directions were measured using Direct Current Differential Transducers. Stress-Strain characteristics, discontinuity, ultimate strength and failure modes in biaxial compression as a function of materials properties are discussed.

Behavior of High-Strength Concrete Under Biaxial Loading
Behavior of High-Strength Concrete Under Biaxial Loading

Author: David W. Fowler

Publisher:

Published: 1986

Total Pages: 11

ISBN-13:

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Research at The University of Texas has been conducted to determine the properties and behavior of plain, high-strength concrete subjected to biaxial-cyclic compression. Static and dynamic tests were performed on a total of 95 specimens which consisted of 5-in. square x 1/2-in. thick plates of concrete. Tests were performed in a biaxial test machine developed at The University of Texas. The primary variables studies were the maximum stress level, expressed as a percent of the uniaxial-static compressive strength, and the biaxial stress ration, expressed as the ratio of the vertical to horizontal stress. Other variables included the stress range and the effect of the moisture content in the material.

Analysis of a high-strength concrete model under biaxial compression
Analysis of a high-strength concrete model under biaxial compression

Author: Paulo Magalhaes Castro

Publisher:

Published: 1983

Total Pages: 146

ISBN-13:

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The behavior of a model of high-strength concrete consisting of nine coarse aggregate circular inclusions in a square mortar matrix is studied under biaxial compressive loads. Constitutive equations are developed following the theory of plasticity in order to describe the behavior of mortar in biaxial compression. The bond between mortar and aggregates is simulated by an interface element. A comparison of analytical and experimental results shows good agreement. (Author).

Microcracking and Behavior of High-Strength Concrete Subject to Biaxial Tension-Compression Stresses
Microcracking and Behavior of High-Strength Concrete Subject to Biaxial Tension-Compression Stresses

Author: Jose' Calixto

Publisher:

Published: 1987

Total Pages: 109

ISBN-13:

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Research at The University of Texas has been conducted to determine the properties and micro-cracking behavior of high-strength concrete subjected to biaxial tension-compression stresses. Static tests and microcrack mapping was performed on 35 specimens which consisted of 5-in. square x 1/2-in. thick plates cut from concrete beams. Tests were performed in a biaxial test machine developed at The University of Texas. The primary variables studied were the discontinuity and ulitimate stress levels at each stress ratio. The microcrack patterns and total crack lengths at various pre-and post-discontinuity stress levels were mapped and recorded. Results indicated that even small amounts of tensile stress reduced stress reduced the ultimate compressive strength of the specimens dramatically. The uniaxial strength of the plates was 75 percent that of standard 4-in. x 8-in. cylinders when both were tested at 172 days after casting. Young's modulus of elasiticity was found to be 3 percent higher for specimens loaded in tension than compression. Keywords: Biaxial tests, High strength, Concrete microcracking.

Constitutive Modelling of High Strength/high Performance Concrete
Constitutive Modelling of High Strength/high Performance Concrete

Author: fib Fédération internationale du béton

Publisher: fib Fédération internationale du béton

Published: 2008-01-01

Total Pages: 134

ISBN-13: 2883940827

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High Strength/High Performance Concrete (HSC/HPC) continues to be the object of particular interest and extensive research, and its use in construction is increasing continuously. fib Bulletin 42 summarises the available information on the material behaviour of HSC/HPC, and develops a set of code-type constitutive relations as an extension of CEB-FIP Model Code 1990. Literature on experimental data and international guidelines, standards and recommendations were reviewed, and already-existing constitutive relations and models were evaluated. In addition to a number of material laws chosen and adjusted for this report, some new constitutive relations were developed based on the collected data. The criteria for the choice of the existing relations as well as the development of the new constitutive relations involved their simplicity and operationality (code-type mathematical formulations). Furthermore, they had to be physically sound and if possible describe the behaviour of both high-performance and normal strength concretes by a unique relation. Finally, compliance with the specifications given in the CEB-FIP Model Code 1990 was examined. This State-of-art report is intended for engineers and represents a summary of the relevant knowledge available to and possessed by the members of the Task Group at the time of its drafting.