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Título del libro: Proceedings Of The 13th Ifip Wg 7.5 Working Conference On Reliability And Optimization Of Structural Systems: Assessment, Design And Life-Cycle Performance
Título del capítulo: Seismic reliability functions for complex systems based on a secant-stiffness reduction index

Autores UNAM:
LUIS ESTEVA MARABOTO; ORLANDO JAVIER DIAZ LOPEZ;

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Autores externos:

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Idioma:

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Año de publicación:
2007

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Palabras clave:

Life cycle; Maximum likelihood; Regression analysis; Seismology; Stiffness; Structural optimization; Collapse failure modes; Complex nonlinear system; Lateral configuration; Least squares regression analysis; Maximum likelihood approaches; Mean and standard deviations; Probabilistic descriptions; Strength and stiffness; Reliability

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Resumen:

The stiffness-reduction index proposed in this study can be efficiently used for the determination of second moment probabilistic descriptions of Z F, the natural logarithm of the minimum value of the intensity required to produce collapse of a complex nonlinear system and, therefore, for the determination of seismic reliability functions of those systems. This is achieved while avoiding the need to depend on the determination of a lateral deformation capacity, which is very sensitive to the strength and stiffness degradation of the system due to its cyclic response, as well as to its lateral configuration at the instant of impending collapse. The determination of the reliability index ? is based on the determination of the mean and standard deviation of Z F, on the basis of a statistical sample of values of Z, the natural logarithm of the intensity, and I SSR, the stiffness-reduction index, in the vicinity of I SSR = 1-0. Information derived from sample points with I SSR cannot be directly taken into account through a conventional least-squares regression analysis, because the corresponding intensities may be equal to or larger than the required minimum values. The maximum likelihood approach presented here is more efficient than one previously proposed by Esteva and Ismael (2004) when only the collapse failure mode is of interest in the evaluation of the seismic vulnerability of a system. © 2007 Taylor & Francis Group.

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Entidades citadas de la UNAM:

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Fuente:


ISBN:
9780415406550
Editorial:
Taylor and Francis/ Balkema

Tipo de producto:
Conference Paper

DOI:
10.1201/b16819-11