Energy demands in reinforced concrete coupled walls under near and far field earthquakes with different approaches to the occurrence of wall plasticity

The use of reinforced concrete wall of the coupling causes better control of lateral displacement and also more energy dissipation due to the earthquake. This paper examines the types of energy demands in coupling walls in which two reinforced concrete walls are coupled by reinforced concrete beams. First, the structures are designed using the spectral analysis method according to valid regulations and then by preparing a nonlinear model of the wall with fiber elements in PERFORM-3D software and performing time history analysis due to near and near earthquakes faults, input energy, kinetic energy, energy Damping and inelastic energy are investigated and the contribution of reinforced concrete beam and wall to energy dissipation is studied. Two approaches, single plastic hinge (SPH) and extended plastic hinge (EPH), are considered for reinforced concrete walls. In the SPH approach, the plastic joint is traditionally allowed only at the foot of the reinforced concrete wall, and the rest of the wall is modeled elastically. In the EPH approach, the entire wall has the ability to expand plasticity. The results showed that in all structures, the share of coupling beams in inelastic energy dissipation is higher than the share of reinforced concrete walls. On average, in the EPH approach, the share of beam beams is about 60% and the share of reinforced concrete walls is about 40% of inelastic energy, and these numbers in the SPH approach are about 77% and 23%, respectively. The reason for the increase in the share of coupling beams from inelastic energy in the SPH model is that the wall is elastic at 90% of its height and the share of the wall decreases, and therefore the share of coupling beams in inelastic energy will increase.