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Finite element modeling and parametric studies of a chevron braced frame with a vertical slotted connection detail Seeton, Andrew
Abstract
This thesis presents the findings of comprehensive parametric sensitivity studies of a series of three-dimensional finite element models. The models considered relate to a steel chevron braced frame system with an innovative vertical slotted connection (VSC) detail that ideally improves the seismic performance of the system by precluding the application of an unbalanced load to the mid-span of the beam upon buckling of either brace. Since simplified models of a prototype specimen of the system were unsuccessful in predicting the experimentally observed behaviour, a sophisticated three-dimensional modeling investigation was undertaken. The primary lateral load resistance and energy dissipation qualities of the chevron braced frame system are provided by the bracing elements. Therefore, these members constituted the initial focus of the modeling investigation. Stub column simulations were undertaken to determine the sensitivity of the predicted local buckling behaviour to an extensive set of modeling-related parameters. Next, a single brace model was developed, to investigate the sensitivity of global buckling predictions to the modeling parameters. The results from the parametric studies of the stub column and single brace models enabled a well-informed approach to the modeling of the full chevron braced frame system with the VSC detail, which itself was also subjected to parametric study. Refined three-dimensional modeling of the VSC detail including material, geometric, and contact nonlinearities enabled the kinematic behaviour of the system to be carefully scrutinized. The general purpose finite element program LS-DYNA was used to conduct the investigation. Five analysis methods were used, including: eigenvalue vibration analysis, eigenvalue buckling analysis, implicit static analysis, implicit dynamic analysis, and explicit dynamic analysis. The capabilities of the analysis methods were tested, and particular focus was placed on the use of the explicit method. While stability considerations limit the maximum allowable time step size for explicit time stepping methods, it was determined that quasi-static solutions could be obtained, so long as a sensitivity study was paired with the analysis in order to quantify the extent to which time scaling procedures affect the results. Although an exact match between the experimental and analytical results was ultimately not achieved, the finite element model was able to capture the key characteristics of the lateral loading response of the proposed chevron braced frame system with a VSC detail.
Item Metadata
Title |
Finite element modeling and parametric studies of a chevron braced frame with a vertical slotted connection detail
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Creator | |
Publisher |
University of British Columbia
|
Date Issued |
2005
|
Description |
This thesis presents the findings of comprehensive parametric sensitivity studies of a series
of three-dimensional finite element models. The models considered relate to a steel chevron
braced frame system with an innovative vertical slotted connection (VSC) detail that ideally
improves the seismic performance of the system by precluding the application of an
unbalanced load to the mid-span of the beam upon buckling of either brace. Since simplified
models of a prototype specimen of the system were unsuccessful in predicting the
experimentally observed behaviour, a sophisticated three-dimensional modeling investigation
was undertaken.
The primary lateral load resistance and energy dissipation qualities of the chevron braced
frame system are provided by the bracing elements. Therefore, these members constituted
the initial focus of the modeling investigation. Stub column simulations were undertaken to
determine the sensitivity of the predicted local buckling behaviour to an extensive set of
modeling-related parameters. Next, a single brace model was developed, to investigate the
sensitivity of global buckling predictions to the modeling parameters. The results from the
parametric studies of the stub column and single brace models enabled a well-informed
approach to the modeling of the full chevron braced frame system with the VSC detail, which
itself was also subjected to parametric study. Refined three-dimensional modeling of the
VSC detail including material, geometric, and contact nonlinearities enabled the kinematic
behaviour of the system to be carefully scrutinized.
The general purpose finite element program LS-DYNA was used to conduct the
investigation. Five analysis methods were used, including: eigenvalue vibration analysis,
eigenvalue buckling analysis, implicit static analysis, implicit dynamic analysis, and explicit
dynamic analysis. The capabilities of the analysis methods were tested, and particular focus
was placed on the use of the explicit method. While stability considerations limit the
maximum allowable time step size for explicit time stepping methods, it was determined that
quasi-static solutions could be obtained, so long as a sensitivity study was paired with the
analysis in order to quantify the extent to which time scaling procedures affect the results.
Although an exact match between the experimental and analytical results was ultimately not
achieved, the finite element model was able to capture the key characteristics of the lateral
loading response of the proposed chevron braced frame system with a VSC detail.
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Genre | |
Type | |
Language |
eng
|
Date Available |
2009-12-11
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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 |
10.14288/1.0063337
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Graduation Date |
2005-05
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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.