Comparison of flat slab strengthening techniques against punching-shear

Massimo Lapi, Daniele Martini, Emilio Zagli, Maurizio Orlando, Antonio Ramos, Paolo Spinelli

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Punching-shear capacity of slab-column connections in existing R/C structures may be inadequate to bear design loads, so strengthening works are required. The lack of punching resistance may be due to detailing, design or building errors; in other cases, such lack is due to a change of use, which requires an increase of resistance. Different techniques have been developed for strengthening R/C slabs against punching: enlargement of the support, gluing external fibre reinforced polymers or casting a bonded concrete overlay (BCO) on the slab's top surface, insertion of post-installed steel bolts, application of fibre reinforced polymers cords as shear reinforcement. In the paper, the authors apply the Critical Shear Crack Theory (CSCT) to all of these techniques and evaluate their efficacy with reference to a case study.
Original languageEnglish
Title of host publicationThe New Boundaries of Structural Concrete 2016, NBSC2016
Place of PublicationCapri
PublisherItaly ACI Chapter
Publication statusPublished - 2016

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Punching
Gluing
Fibers
Polymers
Bolts
Reinforcement
Casting
Concretes
Cracks
Steel

Cite this

Lapi, M., Martini, D., Zagli, E., Orlando, M., Ramos, A., & Spinelli, P. (2016). Comparison of flat slab strengthening techniques against punching-shear. In The New Boundaries of Structural Concrete 2016, NBSC2016 Capri: Italy ACI Chapter.
Lapi, Massimo ; Martini, Daniele ; Zagli, Emilio ; Orlando, Maurizio ; Ramos, Antonio ; Spinelli, Paolo. / Comparison of flat slab strengthening techniques against punching-shear. The New Boundaries of Structural Concrete 2016, NBSC2016. Capri : Italy ACI Chapter, 2016.
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Lapi, M, Martini, D, Zagli, E, Orlando, M, Ramos, A & Spinelli, P 2016, Comparison of flat slab strengthening techniques against punching-shear. in The New Boundaries of Structural Concrete 2016, NBSC2016. Italy ACI Chapter, Capri.

Comparison of flat slab strengthening techniques against punching-shear. / Lapi, Massimo; Martini, Daniele; Zagli, Emilio; Orlando, Maurizio; Ramos, Antonio; Spinelli, Paolo.

The New Boundaries of Structural Concrete 2016, NBSC2016. Capri : Italy ACI Chapter, 2016.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - Punching-shear capacity of slab-column connections in existing R/C structures may be inadequate to bear design loads, so strengthening works are required. The lack of punching resistance may be due to detailing, design or building errors; in other cases, such lack is due to a change of use, which requires an increase of resistance. Different techniques have been developed for strengthening R/C slabs against punching: enlargement of the support, gluing external fibre reinforced polymers or casting a bonded concrete overlay (BCO) on the slab's top surface, insertion of post-installed steel bolts, application of fibre reinforced polymers cords as shear reinforcement. In the paper, the authors apply the Critical Shear Crack Theory (CSCT) to all of these techniques and evaluate their efficacy with reference to a case study.

AB - Punching-shear capacity of slab-column connections in existing R/C structures may be inadequate to bear design loads, so strengthening works are required. The lack of punching resistance may be due to detailing, design or building errors; in other cases, such lack is due to a change of use, which requires an increase of resistance. Different techniques have been developed for strengthening R/C slabs against punching: enlargement of the support, gluing external fibre reinforced polymers or casting a bonded concrete overlay (BCO) on the slab's top surface, insertion of post-installed steel bolts, application of fibre reinforced polymers cords as shear reinforcement. In the paper, the authors apply the Critical Shear Crack Theory (CSCT) to all of these techniques and evaluate their efficacy with reference to a case study.

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Lapi M, Martini D, Zagli E, Orlando M, Ramos A, Spinelli P. Comparison of flat slab strengthening techniques against punching-shear. In The New Boundaries of Structural Concrete 2016, NBSC2016. Capri: Italy ACI Chapter. 2016