Seismic Damage “Semaphore” Based on the Fundamental Period Variation: A Probabilistic Seismic Demand Assessment of Steel Moment-Resisting Frames

During strong earthquakes, structural damage usually occurs, resulting in a degradation of the overall stiffness affected structures. This produces modification dynamic properties structures, for instance, fundamental period vibration (T1). Hence, variation T1 could be used as an indicator seismic damage. In this article, assessment four generic typologies steel buildings was carried focused on verifying T1. To do so, several states were calculated using maximum inter-story drift ratio, MIDR, and following Risk-UE guidelines. Then, series probabilistic nonlinear static analyses implemented Monte Carlo simulations. The approach allows one to vary main mechanical buildings, thus analyzing research 4000 (1000 building samples each typologies). estimated capacity spectrum, it related MIDR state. As result study, expected is provided. Finally, proposal preventive “semaphore” fragility curves are presented. These results may useful parameters or criteria evaluation on-site monitoring buildings.