Vázquez-Rivera, Wilmary

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    Microzonación del periodo fundamental de vibración del terreno y edificios del Recinto Universitario de Mayagüez de la Universidad de Puerto Rico
    (2014) Vázquez-Rivera, Wilmary; Huerta-López, Carlos I.; College of Engineering; Martínez Cruzado, José A.; Ramos Cabeza, Ricardo; Department of Civil Engineering; Huérfano Moreno, Víctor
    The Nakamura’s technique is as an excellent alternative in urban environment for estimating site fundamental period compared to traditional methods such as invasive methods (SPT test), where we need to know in advance geological features of the sites. The Nakamura’s method is useful in areas with low seismic activity rate, allowing the dynamic characterization of soils, and seismic zonation in theories of the dominant vibration of the sites. This research was conducted by obtaining, first, measurements of microtremors distributed in 144 sites throughout the University of Puerto Rico, Mayagüez Campus, and 7 measurements in certain university building. The fundamental vibration periods of the soils were estimated using Nakamura’s technique. We found that taking a single measurement on the roof of the buildings does not allow estimating the fundamental periods of the structures, therefore, were taken simultaneous measurements (roof and floor) combined with the Potential Spectral Density (PSD) to estimate periods of the buildings. Based in the comparison of the soils and buildings fundamental periods, buildings were identified in the University of Puerto Rico, Mayagüez Campus with the largest seismic vulnerability, these being: Civil Engineering and Surveying, and five levels sides of the Student Center. Finally an isoperiods map for the University of Puerto Rico, Mayagüez Campus was obtained.