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Steel and Composite Structures
  Volume 34, Number 1, January10 2020, pages 91-105

Strengthening of steel-concrete composite beams with composite slab
Mahbube Subhani, Muhammad Ikramul Kabir and Riyadh Al-Ameri

    Steel-concrete composite beam with profiled steel sheet has gained its popularity in the last two decades. Due to the ageing of these structures, retrofitting in terms of flexural strength is necessary to ensure that the aged structures can carry the increased traffic load throughout their design life. The steel ribs, which presented in the profiled steel deck, limit the use of shear connectors. This leads to a poor degree of composite action between the concrete slab and steel beam compared to the solid slab situation. As a result, the shear connectors that connects the slab and beam will be subjected to higher shear stress which may also require strengthening to increase the load carrying capacity of an existing composite structure. While most of the available studies focus on the strengthening of longitudinal shear and flexural strength separately, the present work investigates the effect of both flexural and longitudinal shear strengthening of steel-concrete composite beam with composite slab in terms of failure modes, ultimate load carrying capacity, ductility, end-slip, strain profile and interface differential strain. The flexural strengthening was conducted using carbon fibre reinforced polymer (CFRP) or steel plate on the soffit of the steel I-beam, while longitudinal shear capacity was enhanced using post-installed high strength bolts. Moreover, a combination of both the longitudinal shear and flexural strengthening techniques was also implemented (hybrid strengthening). It is concluded that hybrid strengthening improved the ultimate load carrying capacity and reduce slip and interface differential strain that lead to improved composite action. However, hybrid strengthening resulted in brittle failure mode that decreased ductility of the beam.
Key Words
    strengthening; steel-concrete composite; FRP; welded plate; longitudinal shear; profiled steel sheeting; steel deck
Mahbube Subhani, Muhammad Ikramul Kabir and Riyadh Al-Ameri: School of Engineering, Deakin University, 75 Pigdons Road, Waurn Ponds, VIC 3216, Australia

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