Abstract
In the event of an earthquake, the beam-column joints in the reinforced concrete moment-resisting frame structures are affected by a high level of deformations and stresses. Due to these deformations and stresses, the joint can be damaged and even fractured in some cases. The failure of the beam-column joint can cause the building to collapse. In recent years, particular attention has been paid to strengthening joints in the substandard RC buildings. In this paper, the beam-column joint is investigated considering the nonlinear behavior for concrete and steel. For concrete, the damage plasticity model and for reinforcing steels bilinear plasticity model is used. Several examples of tested joints in the technical literature have been modeled before and after strengthening, then numerical and experimental results are compared. Seismic performance of joints has also been studied. The results of this research show good agreement between the results of finite element model and experimental results. Moreover, the retrofitting method have shown could improves the seismic performance of the joint.
Highlights
The beam column joints due to experiencing cyclic deformations during an earthquake are one of the most critical parts of the RC moment-resisting frames
In inelastic range, the curve of numerical results are located above the curve of the experimental results
The pinching effect can be seen in hysteresis curves of the experimental results
Summary
The beam column joints due to experiencing cyclic deformations during an earthquake are one of the most critical parts of the RC moment-resisting frames. The retrofitting technique proposed in that research combines the improvement of the beam longitudinal reinforcing bars' anchorage in the joint, by using extension bars and steel plates and the reinforced concrete jacketing of the columns and the joint area Their experimental results shows a substantial improvement of the overall seismic behavior of the joints retrofitted according to the proposed technique. Yurdakul and his coworker investigated the efficiency of the strengthening method using diagonal post-tension rods in external beam-column joints, which do not comply with any code requirements [17].
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