Outcomes from a broad study on the performance of thin CFRP prestressed concrete slabs in fire

Maluk, Cristian, Bisby, Luke and Terrasi, Giovanni (2015). Outcomes from a broad study on the performance of thin CFRP prestressed concrete slabs in fire. In: Dilum Fernando, Jin-Guang Teng and Jose L. Torero, Proceedings of the Second International Conference on Performance-based and Life-cycle Structural Engineering (PLSE 2015). International Conference on Performance-based and Life-cycle Structural Engineering, Brisbane, QLD, Australia, (953-962). 9-11 December 2015. doi:10.14264/uql.2016.417

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Author Maluk, Cristian
Bisby, Luke
Terrasi, Giovanni
Title of paper Outcomes from a broad study on the performance of thin CFRP prestressed concrete slabs in fire
Conference name International Conference on Performance-based and Life-cycle Structural Engineering
Conference location Brisbane, QLD, Australia
Conference dates 9-11 December 2015
Proceedings title Proceedings of the Second International Conference on Performance-based and Life-cycle Structural Engineering (PLSE 2015)
Place of Publication Brisbane, QLD, Australia
Publisher School of Civil Engineering, The University of Queensland
Publication Year 2015
Sub-type Fully published paper
DOI 10.14264/uql.2016.417
Open Access Status File (Publisher version)
ISBN 9781742721477
Editor Dilum Fernando
Jin-Guang Teng
Jose L. Torero
Start page 953
End page 962
Total pages 10
Collection year 2016
Language eng
Formatted Abstract/Summary
Optimized concrete elements incorporating high-performance, self-consolidating concrete (HPSCC) prestressed with high strength, lightweight, non-corroding carbon fibre reinforced polymer (CFRP) tendons offer great potential for the growing needs of sustainable modern built environment. However, the fire performance of these novel elements is not well known and must be understood before they can be used with confidence in applications where structural fire resistance is required. The outcomes and insights from an extensive experimental research project on the fire performance of thin CFRP prestressed concrete slabs are presented; fire and elevated temperature tests performed at the material and member levels, using novel testing methods and techniques, are examined. Analysis of the studies showed that: (1) a high propensity for heat-induced concrete spalling results in sudden failure of thin CFRP prestressed HPSCC slabs, and when spalling is avoided failure occurs by loss of prestress anchorage governed by a combination of degradation of the epoxy resin around the surface of the CFRP tendons and loss of the concrete’s confining action, due heat-induced transversal forces generated by the CFRP tendons; (2) polypropylene (PP) fibre cross-section and individual fibre length, when added to fresh concrete for spalling mitigation, have considerable influences on the effectiveness of PP fibres at reducing the propensity for heat-induced concrete spalling; (3) the tensile and bond strength of CFRP tendons is more sensitive to elevated temperature than that of the steel prestressing wire; (4) heat-induced transversal (splitting) forces are more likely for CFRP tendons. This extensive experimental programme reveals that conventional fire testing of structural concrete systems, conceived for traditional steel reinforced concrete structural elements, is not necessarily applicable for the design of highly optimized, CFRP prestressed HPSCC elements, and by extension for other similarly novel structural elements.
Keyword Carbon fibre reinforced polymer
Prestressed concrete
Fire behaviour
Heat-induced concrete spalling
Loss of anchorage
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

 
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Created: Wed, 23 Dec 2015, 13:19:21 EST by Anthony Yeates on behalf of Faculty Of Engineering, Architecture & Info Tech