2015 CSCE Annual Conference Regina - Building on our Growth Opportunities

2015 CSCE Annual Conference Regina - Building on our Growth Opportunities Conference


Title
Effect of FRP external retrofitting on axial capacity of RC column when subjected to blast Load

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Author
Mr. Bessam Kadhom, University of Ottawa (Presenter)
Abstract

Bessam Kadhm1, Husham Almansour2, Murat Saatciouglu3

The objective of this study is to investigate the effect of high performance carbon fiber reinforced polymer HP-CFRP external protection on the axial capacity and lateral damage of RC columns when subjected to simulated blast load. In this study, CFRP laminate is designed and optimized in a multi-scale process to : (i) maximize the structural efficiency of the confinment and energy absorption; (ii) Reduction of the residual deformations; (iii) minimize the use of the materials; and (iv) practical field application of the protection layer. Several protected and non-protected half scale concrete columns are tested using shock simulated blast load. The columns were subjected to axial compression of 40% of the column ultimate axial capacity. The axial load, deformation and strains were measured throughout the test. In order to examin the residual capacity of the tested columns, they were loaded axialy up to ultimate load capacity after the application of the blast load.   

The results show that significant reductions in the residual deformation, strains and damage of the protected columns versus non-protected columns have been achieved. Further, more than 90% of the applied axial load has been recovered in the protected columns after the blast shoot. The average residual static axial capacity of the protected columns after the blast load was 30%-50% higher than the design capacity of the non-protected columns. It has been observed that the application of HP-CFRP protection laminate results in significant changes in the trends and peak values of strains and time of occurrence in the reinforcing steel and the surface of the concrete in critical sections.      

Corresponding authors email:  bkadh082@uottawa.ca