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UBC Theses and Dissertations
Numerical modelling of experimental data of reinforced concrete beam-to-column joints Baraka, Miljenko
Abstract
Since the 1970's, increasing attention has been given to seismic design in building codes with emphasis on ductility. Ductile behaviour in reinforced concrete moment resisting frames is important from the point of view of an energy dissipating mechanism. Modern design codes today have stringent guidelines on the design of the beam to column joint region in order to achieve ductile behaviour without brittle shear failure. There are many older buildings, however, that are deficient in strength and ductility with respect to seismic loading. Deficient structures such as these may be retrofitted by encasing the beam to column joint in a steel shell. Cyclic testing of reinforced concrete beam and column sub-assemblies have proven that a very substantial increase in bending and shear strength can be achieved in the joint area by encasing the region with a steel tube and filling the cavity with cement grout. Failures were deflected from the joint area to adjacent members, which were intentionally weakened to form plastic hinges. Subsequent tests on the remaining joint specimens, which forced the failure mechanism into the joint region, provided strength and ductility data for the joint itself. Because experimental testing of scale models can be expensive and at times impractical for every situation that may arise in practice, a non-linear finite element program was written for the analysis of the joint area. The program utilizes plasticity based constitutive descriptions of the concrete and steel material models and intends to be able to predict the behaviour and peak values of the strength envelopes of the joints. Comparisons with available experimental results were encouraging insofar as the plastic behaviour of the concrete and steel were captured. Due to the complex nature of the problem the program was unable to accurately predict the maximum load carrying capacity and more research is required in "fine tuning" the material constitutive models and finite element models. Recommendations for continuing research are given.
Item Metadata
Title |
Numerical modelling of experimental data of reinforced concrete beam-to-column joints
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Creator | |
Publisher |
University of British Columbia
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Date Issued |
1996
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Description |
Since the 1970's, increasing attention has been given to seismic design in building
codes with emphasis on ductility. Ductile behaviour in reinforced concrete moment
resisting frames is important from the point of view of an energy dissipating mechanism.
Modern design codes today have stringent guidelines on the design of the beam to
column joint region in order to achieve ductile behaviour without brittle shear failure.
There are many older buildings, however, that are deficient in strength and ductility with
respect to seismic loading. Deficient structures such as these may be retrofitted by
encasing the beam to column joint in a steel shell.
Cyclic testing of reinforced concrete beam and column sub-assemblies have
proven that a very substantial increase in bending and shear strength can be achieved in
the joint area by encasing the region with a steel tube and filling the cavity with cement
grout. Failures were deflected from the joint area to adjacent members, which were
intentionally weakened to form plastic hinges. Subsequent tests on the remaining joint
specimens, which forced the failure mechanism into the joint region, provided strength
and ductility data for the joint itself.
Because experimental testing of scale models can be expensive and at times
impractical for every situation that may arise in practice, a non-linear finite element
program was written for the analysis of the joint area. The program utilizes plasticity
based constitutive descriptions of the concrete and steel material models and intends to be
able to predict the behaviour and peak values of the strength envelopes of the joints.
Comparisons with available experimental results were encouraging insofar as the plastic
behaviour of the concrete and steel were captured. Due to the complex nature of the
problem the program was unable to accurately predict the maximum load carrying capacity and more research is required in "fine tuning" the material constitutive models
and finite element models. Recommendations for continuing research are given.
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Extent |
7959540 bytes
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Genre | |
Type | |
File Format |
application/pdf
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Language |
eng
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Date Available |
2009-03-07
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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 |
10.14288/1.0050384
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
1997-05
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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.