2 edition of Fracture mechanisms in plain concrete subjected to tension and compression. found in the catalog.
Fracture mechanisms in plain concrete subjected to tension and compression.
William Robert Alastair Knox
Written in English
Thesis (Ph. D.)--The Queen"s University of Belfast, 1968.
|The Physical Object|
The analysis aims to provide preliminary insight into the use of a mesoscopic computational tool for examining the concrete damage mechanisms with the well-known size effect phenomenon as a benchmark scenario. The shapes and the sizes of the fracture process zone (FPZ) during the whole fracture process are by: 1. In the previous companion paper, a recently proposed meso-mechanical model using fracture-based zero-thickness interfaces was used to analyze 2D concrete specimens subject to uniaxial tension, to compare and discuss the results with respect to well-known experimental behavior, and to study the influence of composition and parameters on the Cited by:
The objective of this paper is to develop a simple mechanical model for the analysis and design of plain or fiber‐reinforced concrete shear key joints. The method makes use of well‐known results of fracture mechanics and truss model theory, combined in a simple model. Measurement of fracture energy of a high performance concrete in dynamic tension and high strain rates B. Lukic, D. Saletti, P. Forquin Retrofitting unreinforced masonry buildings with a strain-hardening cement-based composite to enhance seismic resistance.
Concrete is a brittle composite material where the failure mechanism is closely related to the initiation and propagation of cracks. The presence of microcracks and other defects in concrete allows, unlike in the case of an ideal brittle material, the existence of a failure process that includes the branching and bifurcation of the cracks, which gives rise to the appearance of Cited by: When I use the Lee-Fenves model to study the damage of concrete structural, the compression fracture energy confused me,Many researchers study the fracture energy of concrete cased by tension.
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A concrete specimen with the pre-load, inclined crack is analysed in order to simulate different fracture mechanisms in tension or compression. The constitutive model is capable of predicting the kinked-type crack under tension and the wing-type crack under by: The book analyzes a quasi-static fracture process in concrete and reinforced concrete by means of constitutive models formulated within continuum mechanics.
A continuous and discontinuous modelling approach was used. Using a continuous approach, numerical analyses were performed using a finite. SPECIMEN PREPARATION AND TEST PROCEDURE The specimen geometry is shown in Figure 1 a.
This geometry was chosen because of ease of preparation and testing. It should be stressed, however, that there is Fracture toughness of plain concrete from compression splitting tests no reason why other geometries and/or sizes may not be by: 7.
In this paper cyclic quasi-static and constant amplitude fatigue responses of concrete subjected tensile compression–tension biaxial stress are presented. In the tensile region within the biaxial stress space, magnitude of the principal tensile stress is larger.
A fracture mechanism for concrete valid under any state of stress and which can be used to predict observed deformational behavior is postulated on the basis of theoretical considerations. Progression of damage in concrete under compression is complicated because of localized inhomogeneities not only due to aggregates and cement-aggregate interface but also from voids and microcracks.
Voids play a crucial role in determining the compressive strength of concrete, particularly if the concrete is by: 7. tow grades of concrete according to its strength, normal strength concrete (C30) and high strength concrete (C70).
Keywords— Fracture, mechanics, concrete, design. INTRODUCTION. ONCRETE’S tests can be made for different purposes but the main two objectives of testing are quality control and compliance with specifications. A few decades ago much research was undertaken to obtain the tensile properties of concrete using various methods such as a cohesive crack (Hillerborg et al.
), crack band (Bažant ) or the damage process (Lubliner et al. ).The common feature of the aforementioned methods is their use of the concept of a softening curve to arrive at the concrete fracture Cited by: ing, it is likely that some difference in concrete response under compression and tension loading is due to the difference in boundary conditions under variable loading.
For this investigation, concrete elastic material response, in tension and compression, is defined by a single set of material parameters established by standard material testing. plain and reinforced concrete sections and subjected to variable load histories. Bond Behavior Characterized Through Experimental Investigation Data from previous investigations of the bond phenomenon support development of a model to characterize behavior.
In evaluating these data it is necessary to consider first. To investigate the interface mechanics and fracture properties and establish an interface tension-softening constitutive law between concrete and rock for analyzing fracture failure.
FRACTURE MECHANICS OF CONCRETE AND ROCK This book offers engineers a unique opportunity to learn, frominternationally recognized leaders in their field, about the latesttheoretical advances in fracture mechanics in concrete, reinforcedconcrete structures, and rock.
At the same time, it functions as asuperb, graduate-level introduction to fracture mechanics 3/5(2). re mechanics for concrete Size effect can be addressed by fracture mechanics. After all, tension softening type failure (Quasi-brittle failure) can be tackled by However, plain concrete shows strong size effect, that is, the cracking stress depends on.
Investigations to date on plain concrete subjected to repeated compressive loads ranging from zero to maximum compression indicate that fatigue resistance is 50 to 55 percent of the static ultimate or the ultimate crushing Size: 2MB. This paper proposes a tension-compression damage model for concrete materials, formulated within the framework of thermodynamics of irreversible processes.
The aim of this work is to solve the following problems: the premature divergence of numerical solutions under general loading conditions due to the conflict of tensile and compressive damage bounding surfaces, which is Cited by: 1. The fatigue damage mechanisms of concrete under repeated loads are studied.
Based on the results of fatigue tests of concrete beam specimens, new fatigue phenomena and process are found and a computing formula is put forward.
The physical meanings of the formula are explained from the standpoint of mesoscopic fracture mechanics and damage Cited by: 2. The response of concrete under tensile loading is crucial for most applications because concrete is much weaker in tension than in compression.
Understanding the response mechanisms of concrete under tensile conditions is therefore key to understanding and using concrete in structural applications. The fracture mechanism of the nanocomposites can be revealed using fractography analysis.
SEM micrographs of the fracture surface of tensile specimens are shown in Fig. In wt%, the individual sheets are found dispersed with effective uniformity and appear to be coated with epoxy (Fig.
In developing a one-dimensional analysis and design procedure for reinforced concrete structures, research is generally based on yield phenomena and the plastic flow of steel in tension and concrete in compression.
The ability of concrete to resist tension is considered in the form of tension stiffening or is completely disregarded. The formulation covers the full load‐response spectrum in tension as well as in compression. The concrete model is based on the nonassociated flow theory of plasticity with hardening in the prepeak regime and fracture energy‐based softening in the post‐peak regime.
In this paper, the different fracture mechanisms of bulk metallic glasses in tension and compression are investigated through combining its macroscopic fracture behaviors and unique atomic structure.Determine the design strength of the tension member and connection system shown below.
The tension member is a 4 in. x 3/8 in. thick rectangular bar. It is welded to a 1/2 in. thick gusset plate using E70XX electrode. Consider the yielding and fracture of the tension member. Consider the shear strength of the weld metal and the surrounding base.This makes compression a more controlled type of fracture than is tension.
In tension, the first crack is also the fatal one: hence, the stress-strain curve is almost linear. In compression, fracture is preceded by a process of progressive cracking that accounts for the higher strength and the greater curvature of the stress-strain by: