期刊
JOURNAL OF REINFORCED PLASTICS AND COMPOSITES
卷 29, 期 8, 页码 1206-1223出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/0731684409103143
关键词
fiber-reinforced polymer (FRP) composite; prestress; strengthening; two-way slab
资金
- Department of National Defense (DND) of Canada
- Intelligent Sensing for Innovative Structures Network (ISIS Canada)
- Queen's University
This study presents punching shear behavior of two-way slabs strengthened with prestressed or non-prestressed carbon fiber reinforced polymer (CFRP) sheets. Four two-way slabs (2360 x 2360 x 150 mm(3)) with a steel reinforcement ratio of 1.44% are tested under concentric load. All slabs exhibit a punching shear failure mode. The strengthened slabs show an increase of up to approximately 20% in load-carrying capacity and an increase of up to 25% in cracking load with respect to the unstrengthened control slab. A detailed stress analysis in reinforcement is conducted along the loading span of the slabs, including the critical shear perimeter surrounding the column stub. The effective strain zone near the slab-column connection, where a sudden increase of strains in the reinforcement is observed, is also studied. The development of shear stresses in the vicinity of the slab-column connection is examined. A non-linear 3D finite element analysis is conducted and analytical predictive models for the punching shear failure are evaluated as well.
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