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Earthquakes and Structures
  Volume 6, Number 2, February 2014, pages 181-199

Strengthening of hollow brick infill walls with perforated steel plates
Sabahattin Aykac, Ilker Kalkan and Mahmut Seydanlioglu

    The infill walls, whose contribution to the earthquake resistance of a structure is generally ignored due to their limited lateral rigidities, constitute a part of the lateral load bearing system of an RC frame structure. A common method for improving the earthquake behavior of RC frame structures is increasing the contribution of the infill walls to the overall lateral rigidity by strengthening them through different techniques. The present study investigates the influence of externally bonded perforated steel plates on the load capacities, rigidities, and ductilities of hollow brick infill walls. For this purpose, a reference (unstrengthened) and twelve strengthened specimens were subjected to monotonic diagonal compression. The experiments indicated that the spacing of the bolts, connecting the plates to the wall, have a more profound effect on the behavior of a brick wall compared to the thickness of the strengthening plates. Furthermore, an increase in the plate thickness was shown to result in a considerable improvement in the behavior of the wall only if the plates are connected to the wall with closely-spaced bolts. This strengthening technique was found to increase the energy absorption capacities of the walls between 4 and 14 times the capacity of the reference wall. The strengthened walls reached ultimate loads 30-160% greater than the reference wall and all strengthened walls remained intact till the end of the test.
Key Words
    perforated steel plate; hollow brick infill wall; structural strengthening; earthquake behavior; reinforced concrete frame
Sabahattin Aykac: Civil Engineering Department, Gazi University, 06500 Ankara, Turkey
Ilker Kalkan: Department of Civil Engineering, Kirikkale University, 71450 Kirikkale, Turkey
Mahmut Seydanlioglu: Ministry of Environment and Urban Development, 06650 Ankara, Turkey

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