| dc.contributor.author |
MUNIRUZZAMAN, MD. |
|
| dc.date.accessioned |
2024-06-11T06:31:55Z |
|
| dc.date.available |
2024-06-11T06:31:55Z |
|
| dc.date.issued |
2023-12 |
|
| dc.identifier.uri |
http://dspace.mist.ac.bd:8080/xmlui/handle/123456789/828 |
|
| dc.description |
First and foremost, I would like to thank Allah (SWT) with the blessings of Whom all the
good deeds are fulfilled.
I would like to express my deepest gratitude and most humbly enunciate my sincere
appreciation to my supervisor, Lt Col Md Jahidul Islam, Ph.D., Engrs., Associate Professor,
Department of Civil Engineering, Military Institute of Science & Technology (MIST), for
his constant and acute supervision, continuous encouragement, suggestions, instructions,
and compelling discussions. Without his relentless, kind, and diligent perseverance, this
thesis would not have been able to be concluded by me alone. I would also like to thank
Assistant Professor Md. Shahjalal and Research Assistant Tasnia Ahmed for their advice
and assistance needed for the research. I acknowledge the generosity of the Head of the
Department for the financial allocation that made this study possible.
I would like to express my gratitude to all the lab assistants of the Civil Engineering
Department of MIST for their constant technical access and help, without which it would
have been difficult to conduct the experimental work of my study.
Lastly, I am also indebted to the Department of Civil Engineering of MIST for allowing me
to conduct the research successfully. I also acknowledge my family members for their
loving support and encouragement, and I thank our friends and well-wishers for always
supporting and helping me throughout the journey |
en_US |
| dc.description.abstract |
Most old structures in Bangladesh are found to be made of poor-quality materials, lowstrength concrete (about 17 MPa), and brick aggregate because of the acute scarcity of
natural stones in the early days. Moreover, some of them were constructed without proper
compliance with the existing codes, and the updated building code demands a more
stringent design philosophy. Hence, strengthening the structures to comply with the recent
design guidelines becomes an issue of utmost significance. The study examined the
feasibility of using CFRP jacketing to retrofit inferior-quality columns in Bangladesh.
In this study, one-third scale columns made of low-strength recycled brick aggregate
concrete (17 MPa and 10 MPa), with square and rectangular shapes having dimensions of
150 mm x 150 mm x 950 mm (kl/r = 21.94, l/h = 6.33) and 150 mm x 225 mm x 950 mm
(kl/r = 14.63, l/h = 4.22), respectively are tested. Columns are evaluated to find out the
effect on axial capacity, moment capacity, dilation, ductility, and toughness with discrete
and continuous CFRP confinement under eccentric loading. Columns of similar sizes with
no CFRP confinement are also tested under concentric and eccentric loading to compare
their behavior. One square column having no transverse reinforcement was tested to
observe the effect of confinement by tie bars.
The results indicate that CFRP wrapping enhanced the axial capacity, moment capacity,
deformation responses, ductility, and toughness of the columns. It is observed that the
discrete and continuous wrapping increased the axial capacity of a column by at least 27%
and 49%, respectively, and the corresponding moment capacity increased by at least 32%
and 54%. The confined compressive strength (f’cc) of the concrete cylinders increased by a
minimum of 41% and 91%, respectively, due to adding one and two CFRP layers. The ACI
440.2R-17 code is not recommended for FRP systems for concrete with compressive
strength (f'c) less than 17 MPa, but a minimum of 65% higher compressive strength is found
for a lower strength (10 MPa) concrete. Thus, the ACI 440.2R-17 code can be
conservatively used to predict the capacity of a CFRP-confined recycled brick aggregate
concrete column. |
en_US |
| dc.language.iso |
en |
en_US |
| dc.publisher |
Department of Civil Engineering, MIST |
en_US |
| dc.title |
EFFECT OF CARBON FIBER REINFORCED POLYMER RETROFITTING ON RECYCLED BRICK AGGREGATE CONCRETE COLUMN |
en_US |
| dc.type |
Thesis |
en_US |
