Seismic Retrofit of Reinforced Concrete Slab-Column Connections Using Shear Bolts

Shear bolts are a new punching shear retrofit method for existing flat slab structures. This paper describes an experimental investigation on the application of shear bolts to reinforced concrete slab-column connections subjected to increasing cyclic lateral drift and constant gravity loading. Shear bolts, as transverse shear reinforcement, were installed externally in three specimens in holes drilled through the slabs? thickness in the vicinity of the columns. The test results show that shear bolts increase lateral load-resisting capacity, lateral drift capacity at peak and ultimate loads, and ductility of the slab-column connections. Shear bolts also change the failure mode of the slab-column connections from brittle to ductile and increase the energy dissipation capacity. Although the conclusions are made specifically for shear bolt retrofitted slabs, some of these findings can also be helpful in enhancing understanding of the behavior of flat reinforced concrete slabs with and without shear reinforcements.


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  • Accession Number: 01142632
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 11 2009 8:52PM