Browsing by Autor "J. C. Barboza"

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    Determinación de períodos predominantes en edificaciones de mediana altura en la ciudad de Mérida
    (2003) Adriana Inés Grassi de De Barcia; J. C. Barboza
    This paper shows a study of eleven reinforced concrete buildings, located along the terrace of the city of Merida, with a height of four stories which is considered representative of medium height buildings in the city. The technique used was that of microtremor measurements. The microtremor measurements were carried out at the fourth and first floors of each building. Fourier spectra were determined for the signals of the three channels used, located one in the longitudinal direction of the building (CH1), the other in the transverse direction (CH3) and the third in the vertical direction (CH2); Fourier espectral ratios were obtained between fourth and first floors and in addition, Nakamura ratios were also determined. As a result of the three techniques used, structural fundamental periods in a range from 0.17 to 0.30 seconds were obtained. To study the possibble occurrence of resonance, these results were compared to periods obtained from previous microtemor measurements conducted to the soil of the city (Montilla, 1998 ; Hernandez et al, 1998). In consecuence, it is expected that some of the buildings of Merida with characteristics similar to those studied in this work, might suffer the effect of resonance.
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    Estimación de la respuesta sísmica de la terraza de la ciudad de Mérida, Venezuela
    (2003) D. Grisolía; J. C. Barboza; Pedro J. Rivero
    Se analiza la respuesta sismica unidimensional de dos perfiles longitudinales de suelo de la terraza de la ciudad de Merida, considerando comportamiento no lineal del material; aplicando catorce acelerogramas y nuevas relaciones de perdida de rigidez con el incremento de la deformacion cortante ciclica. Los resultados muestran como la aceleracion en superficie se incrementa con el aumento en la profundidad de la roca y como las mayores amplificaciones espectrales se dan entre 0.20 y 0.40 seg el cual corresponde, aproximadamente, con el rango de periodos predominantes de buena parte de las edificaciones construidas sobre la terraza de la ciudad de Merida.