Efficient near surface mounting CFRP strengthening of pretensioned hollowcore slabs with opening - An experimental study

Pachalla, S K S and S, Suriya Prakash (2017) Efficient near surface mounting CFRP strengthening of pretensioned hollowcore slabs with opening - An experimental study. Composite Structures, 162. pp. 28-38. ISSN 0263-8223

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Carbon fiber reinforced polymers (CFRP) are commonly used in strengthening of civil infrastructure due to their superior mechanical properties. Near surface mounting (NSM) of CFRP laminates is an efficient strengthening scheme to restore the capacity of concrete elements. Hollowcore slabs are pretensioned precast concrete elements reinforced only with prestressing strands. Due to various service requirements, openings/cut-outs are provided in the slabs. Reinstating the capacity of hollowcore slabs lost due to the presence of openings is very important as openings can severely reduce the capacity of these slabs and alter the load distribution in the floor system. This paper investigates the efficiency of NSM technique using CFRP laminates in restoring the capacity of hollowcore slabs with openings. Ten full scale hollow core slabs were tested at two shear span to depth (aid) ratios and with two different locations of opening. Presence of opening reduced the ultimate capacity of slab by 44% and NSM CFRP strengthening fully restored the lost capacity based on aid ratio. The adopted strengthening was more effective in shear dominated than in flexure dominated specimens. However, in both aid ratios, good improvement- in initial stiffness was observed due to NSM CFRP strengthening.

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IITH Creators:
IITH CreatorsORCiD
S, Suriya Prakashhttp://orcid.org/0000-0003-0319-1773
Item Type: Article
Uncontrolled Keywords: NSM; CFRP; Cut-out; Opening; Strengthening; Hollowcore slabs; Flexure; Flexure-shear
Subjects: Materials Engineering > Materials engineering
Materials Engineering > Composite materials
Civil Engineering > Soil Structure Interaction
Divisions: Department of Civil Engineering
Depositing User: Team Library
Date Deposited: 10 Mar 2017 04:00
Last Modified: 26 Jul 2017 09:03
URI: http://raiith.iith.ac.in/id/eprint/3083
Publisher URL: https://doi.org/10.1016/j.compstruct.2016.11.072
OA policy: http://www.sherpa.ac.uk/romeo/issn/0263-8223/
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