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.

Comparison of flat slab strengthening techniques against punching-shear / Lapi, Massimo; Martini, Daniele; Zagli, Emilio; Orlando, Maurizio; Ramos, Antonio; Spinelli, Paolo. - STAMPA. - (2016), pp. 299-308. ((Intervento presentato al convegno 4th Workshop on "The New Boundaries of Structural Concrete" - University of Naples Federico II - ACI Italy Chapter tenutosi a CAPRI nel September 29th – October 1st, 2016.

Comparison of flat slab strengthening techniques against punching-shear

Lapi, Massimo;ORLANDO, MAURIZIO;SPINELLI, PAOLO
2016

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.
4th Workshop on "The New Boundaries of Structural Concrete" - University of Naples Federico II - ACI Italy Chapter, At Capri
4th Workshop on "The New Boundaries of Structural Concrete" - University of Naples Federico II - ACI Italy Chapter
CAPRI
September 29th – October 1st, 2016
Lapi, Massimo; Martini, Daniele; Zagli, Emilio; Orlando, Maurizio; Ramos, Antonio; Spinelli, Paolo
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2158/1084372
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