Influence of Reinforcing Steel Post-Capping Strength Deterioration on Collapse Resistance Capacity of a Single-Storey RC Planar Frame

Seismic analysis and design based on collapse probability under intense earthquakes is the main trend in the field of earthquake engineering. Accurate evaluation of collapse resistance capacity is necessary to achieve this target. Due to the accumulated deformation during seismic excitations, structural components would have different stiffness and strength deterioration characteristics. For evaluating the collapse capacity of the structure, it is important to take into account the deterioration characteristics in the analytical model. In this paper, the constitutive models for concrete and reinforcing steel, especially those adopted in Open Sees analytical software, are reviewed first. Then, a reinforced concrete single-storey planar frame structure with one bay is taken as case study and the effect of post-capping strength deterioration of reinforcing steel on evaluation results of global collapse resistance capacity is mainly investigated by incremental dynamic analysis (IDA) via Open Sees software. Analytical results show that global collapse resistance capacity will be significantly overestimated without considering the effect of post-capping strength deterioration of reinforcing steel.