Flexure retrofitting of ribbed one-way reinforced concrete slabs through external reinforcing bars

In many cases, lack of a proper design can be nowadays reported in existing similar one way ribbed slabs, in relation to the following key-points:

• High span over effective depth ratios; • Disregard or bad evaluation of superimposed-

live load; • Change in use, which can results in more oner-

ous loading; • Lack of top 40-50 mm concrete layer; • Lack of any top reinforcement; • Small concrete covers; • Disregard of long-term deformations; • Lack of skill labor during execution; • Steel corrosion, concrete and masonry degra-

dation.