Journal ArticleDOI
Strain-softening of concrete in uniaxial compression
J.G.M. Van Mier,Surendra P. Shah,M. Arnaud,Jean-Paul Balayssac,A. Bascoul,Sokhwan Choi,D. Dasenbrock,G. Ferrara,Catherine E French,M. E. Gobbi,Bhushan Lal Karihaloo,G. König,Michael D. Kotsovos,Joseph F. Labuz,D. Lange-Kornbak,G. Markeset,Milija N. Pavlović,G. Simsch,Karl-Christian Thienel,Anaclet Turatsinze,M. Ulmer,H. J.G.M. Van Geel,M.R.A. van Vliet,D. Zissopoulos +23 more
TLDR
In this article, an extensive Round Robin test programme on compressive softening was carried out by the RILEM Technical Committee 148-SSC to measure strain softening response of concrete under uniaxial compression, and the main variables in the test programme were the specimen slenderness h/d and the boundary restraint caused by the loading platen used in the experiments Both high friction and low friction loading systems were applied.Abstract:
0025-5432/97 © RILEM tory cast its own specimens following a prescribed recipe The pre-peak behaviour was found to be independent of specimen slenderness when low friction loading platens were used However, for all loading systems a strong increase of (post-peak) ductility was found with decreasing specimen slenderness Analysis of the results, and comparison with data from literature, showed that irrespective of the loading system used, a perfect localization of deformations occured in the post-peak regime, which was first recognised by Van Mier in a series of uniaxial compression tests on concrete between brushes in 1984 Based on the results of the Round Robin, a draft recommendation will be made for a test procedure to measure strain softening of concrete under uniaxial compression Although the post-peak stress-strain behaviour seems to be a mixture of material and structural behaviour, it appears that a test on either prismatic or cylindrical specimens of slenderness h/d = 2, loaded between low friction boundaries (for example by inserting sheets of tef lon between the steel loading platen and the specimen), yields reproducible results with relatively low scatter For normal strength concrete, the closed-loop test can be controlled by using the axial platen-to-platen deformation as a feed-back signal, whereas for high-strength concrete either a combination of axial and lateral deformation should be used, or a combination of axial deformation and axial load FOREWORD An extensive Round Robin test programme on compressive softening was carried out by the RILEM Technical Committee 148-SSC “Test methods for the Strain Softening response of Concrete” The goal was to develop a reliable standard test method for measuring strain softening of concrete under uniaxial compression The main variables in the test programme were the specimen slenderness h/d and the boundary restraint caused by the loading platen used in the experiments Both high friction and low friction loading systems were applied Besides these main variables, which are both related to the experimental environment under which softening is measured, two different concretes were tested: a normal strength concrete of approximately 45 MPa and a higher strength concrete of approximately 75 MPa In addition to the prescribed test variables, due to individual initiatives, the Round Robin also provided information on the effect of specimen shape and size The experiments revealed that under low boundary friction a constant compressive strength is measured irrespective of the specimen slenderness For high friction loading systems (plain steel loading platen), an increase of specimen strength is found with decreasing slenderness However, for slenderness greater than 2 (and up to 4), a constant strength was measured The shape of the stress-strain curves was very consistent, in spite of the fact that each laboraRILEM TC 148-SSC: TEST METHODS FOR THE STRAIN-SOFTENING RESPONSE OF CONCRETEread more
Citations
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Journal ArticleDOI
Lattice Discrete Particle Model (LDPM) for failure behavior of concrete. II: Calibration and validation
TL;DR: The Lattice Discrete Particle Model (LDPM) is calibrated and validated in the preceding Part I of this study as discussed by the authors, and the results of numerical simulations are compared with experimental data gathered from the literature.
Journal ArticleDOI
Study of the Behavior of Concrete under Triaxial Compression
TL;DR: Sfer et al. as mentioned in this paper proposed a method to solve the problem by using the Sfer algorithm, which can be found at the Facultad de Ciencias Exactas and Tecnologia; Argentina
Journal ArticleDOI
Shape and Size Effects on the Compressive Strength of High-strength Concrete
TL;DR: In this article, the authors investigated the influence of the shape and size of the specimens on the compressive strength of high-strength concrete and found that the post-peak behavior of the cubes is milder than that of the cylinders, which results in a strong energy consumption after the peak.
Journal ArticleDOI
Fracture energy based bi-dissipative damage model for concrete
Claudia Comi,Umberto Perego +1 more
TL;DR: In this article, an isotropic damage model for concrete is presented, where the main features of the model are: limited number of constitutive parameters required; independent modelling of tension and compression behaviour by means of two damage variables and two separate activation criteria (bi-dissipative model); independent definition of tension/compression fracture energies; consistent modelling of the unilateral effect upon transition from tension to compression; and the effectiveness of fracture energy based regularization strategy.
Journal ArticleDOI
Compressive behaviour of recycled aggregate concrete under impact loading
TL;DR: In this paper, the compressive behaviour of recycled aggregate concrete (RAC) with different recycled coarse aggregate (RCA) replacement percentages was experimentally investigated under quasi-static to high strain rate loading.
References
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Book
Fracture Processes of Concrete
TL;DR: In this article, a clear and thorough explanation of the mechanical properties and fracture processes of concrete is given, followed by an evaluation of test methods for assessing both experimental and numerical models.
Journal ArticleDOI
Effect of Length on Compressive Strain Softening of Concrete
TL;DR: In this article, a feedback-control method using a linear combination of displacement and force that partially subtracts the elastic response of the specimen to give a stable feedback signal is used to explore localization in compression.
Softening of concrete loaded in compression
TL;DR: A submitted manuscript is the version of the article upon submission and before peer-review as mentioned in this paper, while a published version is the final layout of the paper including the volume, issue and page numbers.
Journal ArticleDOI
Effect of testing techniques on the post-ultimate behaviour of concrete in compression
TL;DR: In this paper, the authors investigated the effect of testing techniques on the behaviour of plain concrete specimens under increasing uniaxial compressive load and found that for load increasing to the maximum level that can be sustained by the specimen, specimen behaviour is essentially independent of testing technique effects.
Journal ArticleDOI
Multiaxial strain-softening of concrete
TL;DR: In this paper, a multiaxial apparatus for testing cubical specimens was developed and built at Eindhoven University of Technology to measure stable post-peak response of concrete.