Shear Strength of Fiber Reinforced Concrete Beam-Column Joints under Seismic Loading

Abstract eng:
Existing reinforced concrete frames constructed before the 1970s and some present buildings are often characterized by an inadequate seismic resistance: beam-column connections in a ductile reinforced concrete frame is a critical region, especially under the action of earthquake loading. These structures were designed for gravity loads and are often inadequately detailed to resist to severe seismic loads. Different methods have been used and studied by several researchers for strengthening and increasing the resistance of reinforced concrete beam-column joints. Among these the use of fiber-reinforced concrete has shown to permit connections to satisfactorily perform under large shear reversals with excellent damage tolerance. In this paper several experimental studies, done by other researchers on beam-column joints both without and with fiber reinforcements, have been taken into account. On the basis of the studies conducted by the author on interior and exterior beam-column joints, it is here proposed a new formula that predicts the shear strength of fiber-reinforced concrete beam-column joints. The shear strength values obtained with this formula have been compared to those derived by the experimental tests. It has been found that the here proposed expression gives an accurate and uniform prediction of the shear resistance, as it properly estimates the tests results.

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