- Library Home /
- Search Collections /
- Open Collections /
- Browse Collections /
- UBC Theses and Dissertations /
- Out-of-plane seismic performance of unreinforced clay...
Open Collections
UBC Theses and Dissertations
UBC Theses and Dissertations
Out-of-plane seismic performance of unreinforced clay brick masonry walls Meisl, Christopher Stephan
Abstract
Given sufficient anchorage to the diaphragms, out-of-plane walls in unreinforced masonry buildings have been shown to crack above mid-height and rock as two rigid bodies. This study investigates the sensitivity of the rocking response to the type of ground motion and the quality of the wall construction. A parametric study using a nonlinear-elastic single-degree-of-freedom model suggests that buildings located on firm ground sites are less likely to experience out-ofplane wall failures compared with buildings located on soft soil sites. Shake table tests were conducted on four full-scale multi-wythe walls with a height-to-thickness (h/t) ratio of 12, varying construction quality, and using three different ground motions. All walls experienced cracking at approximately peak ground acceleration (PGA) of the 2005 National Building Code of Canada (NBCC) level for Vancouver, but exhibited a stable rocking behaviour without collapse beyond a ground motion 1.5 times the 2005 NBCC level. Simple analytical methods were used to calculate the un-cracked wall stiffness, maximum force on an un-cracked wall, cracking strength, and the maximum total force acting on a cracked wall. These results compared well with those observed in the tests. Finally, a rigid body numerical model was developed using the commercially available software, Working Model. The results obtained using this model compared well to the full-scale tests, accurately predicting the maximum relative displacement at the crack location for the scaled ground motions used in the testing program.
Item Metadata
Title |
Out-of-plane seismic performance of unreinforced clay brick masonry walls
|
Creator | |
Publisher |
University of British Columbia
|
Date Issued |
2006
|
Description |
Given sufficient anchorage to the diaphragms, out-of-plane walls in unreinforced masonry
buildings have been shown to crack above mid-height and rock as two rigid bodies. This study
investigates the sensitivity of the rocking response to the type of ground motion and the quality
of the wall construction. A parametric study using a nonlinear-elastic single-degree-of-freedom
model suggests that buildings located on firm ground sites are less likely to experience out-ofplane
wall failures compared with buildings located on soft soil sites. Shake table tests were
conducted on four full-scale multi-wythe walls with a height-to-thickness (h/t) ratio of 12,
varying construction quality, and using three different ground motions. All walls experienced
cracking at approximately peak ground acceleration (PGA) of the 2005 National Building Code
of Canada (NBCC) level for Vancouver, but exhibited a stable rocking behaviour without
collapse beyond a ground motion 1.5 times the 2005 NBCC level. Simple analytical methods
were used to calculate the un-cracked wall stiffness, maximum force on an un-cracked wall,
cracking strength, and the maximum total force acting on a cracked wall. These results compared
well with those observed in the tests. Finally, a rigid body numerical model was developed using
the commercially available software, Working Model. The results obtained using this model
compared well to the full-scale tests, accurately predicting the maximum relative displacement at
the crack location for the scaled ground motions used in the testing program.
|
Genre | |
Type | |
Language |
eng
|
Date Available |
2010-01-08
|
Provider |
Vancouver : University of British Columbia Library
|
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.
|
DOI |
10.14288/1.0063285
|
URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
|
Graduation Date |
2006-05
|
Campus | |
Scholarly Level |
Graduate
|
Aggregated Source Repository |
DSpace
|
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.