Nonlinear seismic analysis of a reinforced concrete frame building using fibre distributed plasticity element model and fibre hinge model

Numerical modelling, a useful technique for simulating structural behaviour, is challenging when choosing analytical models for structural elements and nonlinear associated material models. The seismic behaviour of a reinforced concrete frame building designed to withstand earthquake loads is evaluated in the current work using nonlinear static and dynamic analyses. The distributed inelasticity element model, the fibre hinge model, and a combined version of the two prior models are used to simulate the columns and beams of RC frames. These three models are validated using the results of the RC column test while the plastic hinge's length in fibre models is estimated using empirical equations. The study revealed that the results varied depending on the various analysis techniques, modelling approaches of elements, and plastic hinge lengths. Nonlinear static analysis is shown to be safe and more conservative for evaluating a residential RC frame building whose dynamic response is controlled by the first mode of vibration. Nevertheless, for modelling the frame elements, it is preferred to use the distributed plasticity model or a combination of the distributed plasticity and fibre hinge models.