Load resistance and failure modes of GFRP composite strengthened hollow core slabs with openings

Precast hollow core slabs are mainly used in buildings as slab elements apart from their usage as bridge decks. Due to various structural or service requirements, openings are provided in these slabs. Provision of openings reduces the strength, stiffness and also change the failure modes of the holl...

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Bibliographic Details
Published inMaterials and structures Vol. 50; no. 1; pp. 1 - 14
Main Authors Pachalla, Sameer Kumar Sarma, Prakash, S. Suriya
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 01.02.2017
Springer Nature B.V
Subjects
Bonding
Building construction
Building Materials
Civil Engineering
Engineering
Failure modes
Glass fiber reinforced plastics
Machines
Manufacturing
Materials Science
Original Article
Processes
Slabs
Solid Mechanics
Stiffness
Strength
Strengthening
Theoretical and Applied Mechanics
Ultimate tensile strength
GFRP composites
Strengthening
Prestress
Openings
Hollow core slabs
Cut-outs
Precast
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Summary:Precast hollow core slabs are mainly used in buildings as slab elements apart from their usage as bridge decks. Due to various structural or service requirements, openings are provided in these slabs. Provision of openings reduces the strength, stiffness and also change the failure modes of the hollow core slabs. Therefore, it is essential to strengthen the slabs so that the load deformation behaviour and failure mode does not change drastically. The objective of this study is to understand the behaviour of glass fibre reinforced polymer (GFRP) strengthened hollow core slabs with openings by external bonding technique. Ten full scale hollow core slabs with and without openings are tested to evaluate the effect of openings and effectiveness of GFRP strengthening. Shear span to depth ratio ( a / d ) and location of openings are considered as variables. It was observed that, provision of opening reduced the ultimate strength by about 43 % and GFRP strengthening of this slab restored strength to 87 % of the control specimen. Test results indicate that GFRP strengthening is an effective and cost viable technique for restoring the strength and stiffness of precast prestressed hollow core slabs due to openings.
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ISSN:1359-5997
1871-6873
DOI:10.1617/s11527-016-0883-8