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Seismic shear response of rc members with varying ductility Roux, Scott
Abstract
Experimental results of twelve reinforced concrete specimens subjected to reverse cyclic shear are presented. The tests were performed as part of a long-term research program that is presently underway at the University of British Columbia to develop a rational model for seismic shear design. The main objective of this investigation was to test reinforced concrete specimens under well-defined loading conditions in order to provide insight into the behaviour of structural members subjected to reverse cyclic shear. A secondary objective was to develop a scheme to obtain a comprehensive record of crack patterns and deformations. Enhancements made to both the experimental documentation and the specimen boundary conditions are described. A number of parameters are investigated to examine their effect on a reinforced concrete member's behaviour during reverse cyclic shear. The influence of shear span (the ratio of maximum bending moment to shear), amount of transverse reinforcement, axial load (tension and compression), and the presence of distributed longitudinal reinforcing steel are examined. It is apparent that decreasing the shear span will result in a reduction of the amount of flexural ductility exhibited by a member whereas increasing the amount of transverse reinforcement improves both crack control and flexural ductility. It is also apparent that adding axial compression increases the shear capacity of a reinforced concrete element and reduces crack angles, whereas applied axial tension results in increased crack inclinations and a reduced shear capacity. The addition of distributed reinforcing steel was found to enhance crack control and resulted in improved energy dissipation. Experimental results are compared to initial and final shear capacity predictions made using ATC-6-2 provisions. Based on the favourable agreement between the experimental and predicted shear capacities, it appears that the model successfully captures the degradation of shear strength with increased ductility demands. However, although the ATC-6-2 provisions using the simplified "Vc+Vs" method for calculating shear strength provided reasonable estimates of the initial and final shear strengths, perhaps a more refined, rational method of calculating shear resistance, such as the Modified Compression Field Theory, would improve the predictions and provide greater insight into the mechanisms present during reverse cyclic shear.
Item Metadata
Title |
Seismic shear response of rc members with varying ductility
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1998
|
Description |
Experimental results of twelve reinforced concrete specimens subjected to reverse
cyclic shear are presented. The tests were performed as part of a long-term research
program that is presently underway at the University of British Columbia to develop a
rational model for seismic shear design.
The main objective of this investigation was to test reinforced concrete specimens
under well-defined loading conditions in order to provide insight into the behaviour of
structural members subjected to reverse cyclic shear. A secondary objective was to
develop a scheme to obtain a comprehensive record of crack patterns and deformations.
Enhancements made to both the experimental documentation and the specimen boundary
conditions are described.
A number of parameters are investigated to examine their effect on a reinforced
concrete member's behaviour during reverse cyclic shear. The influence of shear span
(the ratio of maximum bending moment to shear), amount of transverse reinforcement,
axial load (tension and compression), and the presence of distributed longitudinal
reinforcing steel are examined.
It is apparent that decreasing the shear span will result in a reduction of the
amount of flexural ductility exhibited by a member whereas increasing the amount of
transverse reinforcement improves both crack control and flexural ductility. It is also
apparent that adding axial compression increases the shear capacity of a reinforced
concrete element and reduces crack angles, whereas applied axial tension results in
increased crack inclinations and a reduced shear capacity. The addition of distributed
reinforcing steel was found to enhance crack control and resulted in improved energy
dissipation.
Experimental results are compared to initial and final shear capacity predictions
made using ATC-6-2 provisions. Based on the favourable agreement between the
experimental and predicted shear capacities, it appears that the model successfully captures the degradation of shear strength with increased ductility demands. However,
although the ATC-6-2 provisions using the simplified "Vc+Vs" method for calculating
shear strength provided reasonable estimates of the initial and final shear strengths,
perhaps a more refined, rational method of calculating shear resistance, such as the
Modified Compression Field Theory, would improve the predictions and provide greater
insight into the mechanisms present during reverse cyclic shear.
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Extent |
7634011 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-05-05
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0050214
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1998-05
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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Item Media
Item Citations and Data
Rights
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.