John Gales
- From: St. Thomas, Canada
- Qualifications:
- M.A.Sc Civil Engineering, Queen's University, Canada (2009)
- B.A.Sc Civil Engineering, University of Ottawa, Canada (2007)
- Supervisors: Dr. L. Bisby and Dr. M. Gillie
- Postgraduate study: Started 2009
PhD Project:
Post-tensioned concrete structures at elevated temperature and in fire
Modern high-rise concrete structures are increasingly being built using prestressed steel reinforcement via the construction method of post-tensioning (PT). This type of construction provides economic advantages over conventional (non-prestressed) reinforced concrete structures by enabling longer and thinner flat plate floor slabs, rapid construction, and better control of in-service deflections. Today our knowledge of PT concrete buildings during (and after) fire is based largely on dated prescriptive standard fire testing of simply supported concrete floors tested during the early 1960s. These tests failed to capture the true structural behaviour observed during real fires in real buildings (particularly considering the changes which have occurred in PT construction techniques and materials since the 1960s). To address this knowledge gap, this project is taking a novel and holistic approach to rationally assess and understand the behaviour of modern PT concrete structures during and after fire. This is being achieved in three phases;- assessing current prescriptive and performance based code practices for modelling realistic buildings,
- exploring the high temperature mechanical behaviour of prestressing steel (softening and creep relations), and
- rationally describing the interaction between concrete and prestressing steel in a realistic PT concrete assembly under fire (through large-scale structural testing).
Posters
|
"Heating-Induced Prestress Variation in Unbonded Post-
Tensioned (UBPT) Construction: Potential Consequences for Post-Fire Performance"
By Luke Bisby, Kevin MacLean, Colin MacDougall, John Gales Awarded 'best poster' prize at:
|
2009 |
Previous projects
- Transient High-Temperature Prestress Relaxation of Unbonded Prestressing Tendons for use in Concrete Slabs (M.A.Sc Eng thesis, 2009)
- Environmental overview of long term care facilities in Ontario, Canada (2005, 2009)
Awards and Project Funding
- Ontario Graduate Scholarship (2007-2008)
- NSERC Post Graduate Scholarship Masters (2008-2009)
- Scottish Overseas Graduate Research Scholarship (2009-2012)
Project Publications
- Gales, J., Bisby, L.A., and Gillie, M (2011) Unbonded Post Tensioned Concrete Slabs in Fire- Part I- Experimental Response of Unbonded Tendons under Transient Localized Heating. Journal of Structural Fire Engineering. 2 (3):139-153.
- Gales, J., Bisby, L.A., and Gillie, M (2011) Unbonded Post Tensioned Concrete Slabs in Fire - Part II Š Modelling Tendon Response and the Consequences of Localized Heating. Journal of Structural Fire Engineering. 2(3): 155-171.
- Gales, J., Bisby, L.A., and Gillie, M (2011) Unbonded Post Tensioned Concrete in Fire: A Review of Data from Furnace Tests and Real Fires. Fire Safety Journal. 46:151-163.
- Gales, J., Bisby, L.A., and MacDougall, C., (June 2-4th 2010) Fire Induced Transient Creep Causing Stress Relaxation and Tendon Rupture in Unbonded Post-Tensioned Structures: Experiments and Modelling. 6th International proceedings of SIF in Detroit Michigan: 727-735.
- Bisby, L.A., Gales, J., and Gillie, M (February 25-26th 2010) A Critical Review: The Historical Basis for the Fire-Safe Design of UPT Concrete Buildings. FSIW conference at University of Ulster and poster presentation in Dublin, Ireland, February 2010.
- Gales, J., Bisby, L.A., MacDougall, C.C., and MacLean K.J.N. (2009) Unbonded Post-Tensioned Structures in Fire: Transient High Temperature Stress Relaxation. Fire Safety Journal. 44(4): 570-579.
- Bisby, L.A., MacLean K.J.N., MacDougall, C.C., and Gales, J. (February 19-20th 2009) Heating-Induced Prestress Variation in Unbonded Post-Tensioned (UBPT) Construction: Potential Consequences for Post-Fire Performance. The International Conference on Applications of Structural Fire Engineering in Prague, CR. Poster work.
- Gales, J., Bisby, L.A., and MacDougall, C.C. (January 26-28th 2009) Irrecoverable Prestress Loss in Unbonded Post-Tensioned Concrete Slabs in Fire. Fire and Materials 12th International Conference proceedings in San Francisco, CA: 437-448.
- Gales, J. (2009) Transient High-Temperature Prestress Relaxation of Unbonded Prestressing Tendons for use in Concrete Slabs. QueenÕs University. Canadian Theses. Library and Archives Canada. 198 pp. ISBN: 9780494651735.
Additional Publications
- Gales, J. (2011) The Westmount Arena Fire. Society of International Hockey Research Journal. 48-53.
- Gales, J., Roy-Poirier, A., and Champagne, P. (July 6-8th 2009) Long-Term Care Facilities in Ontario, Canada: A Waste Management Overview. Proceedings of the IASTED International Conference on Environmental Management and Engineering: 97-102.
