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Improvement of the bonding and interaction between concrete and steel is crucial to achieving an optimal reinforced concrete member. The proposed technique in this paper is using perforated steel plates (PSPs) to reinforce two‐way concrete slabs. In this method, ordinary steel bar reinforcements in the tension region of the concrete slabs were replaced by PSPs. Concrete slabs reinforced with PSPs enhance structural characteristics with respect to concrete slabs reinforced with ordinary reinforcement (OR) due to the higher lateral stiffness of PSPs, the better confinement of concrete within the holes of PSPs, the biaxial performance of the steel in the tension region, and the efficient load transmission mechanism between the steel and concrete. In this paper, a comprehensive experimental investigation was conducted on two‐way concrete slabs reinforced with PSPs and ordinary steel bars. The behavior of PSPs slabs was evaluated in comparison with OR slabs in terms of failure types, ductility, energy absorption, stiffness, ultimate load, cracking load, and force transmission mechanism. Findings revealed that the PSPs slabs have higher ductility, energy absorption, and ultimate strength compared to the OR slabs. [ABSTRACT FROM AUTHOR]

In this paper, the effects of rocking and fixed base prestressed columns and conventional reinforced concrete columns on the response of frames are investigated. Also, the influence of some selected rocking base prestressed columns on the response of the concrete frame was studied. Three types of a concrete frame with conventional Reinforced Concrete columns, rocking, and fixed base prestressed columns were modeled using the finite element method in Opensees software. The details of the simulation of the rocking and fixed base columns in Opensees are described precisely. The results obtained from the models were compared with those of the literature to evaluate the validity of the results. Ten ground motion records were applied to the frames to investigate the frame responses under different earthquakes. In this regard, 350 nonlinear dynamic analyses were carried out. The obtained results indicate that rocking frames experience more maximum displacement than RC frames. However, rocking columns decrease residual displacement with respect to RC columns. In the low seismic region, when the rocking columns were placed in the middle of the frame, the residual displacement of the frame was decreased significantly. On the other hand, in the areas with moderate and high seismicity, the performance of the frame with rocking columns located on the sides of the frame was improved. Moreover, the arrangement of the rocking frames has a considerable effect on the concrete frame responses. However, there is a negligible difference in concrete frame responses with the different prestressed stories. [ABSTRACT FROM AUTHOR]