Browsing by Author "Llera Martín, Juan Carlos de la"

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    Accidental and natural torsion in earthquake response and design of buildings
    (1996) Chopra, A. K.; Llera Martín, Juan Carlos de la
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    Análisis y diseño del Hospital Militar
    (2002) Stagno, Patricio; Frerk, Jaime; Stagno, Daniel; Rendic, Percy; Iturriaga, Waldo; Llera Martín, Juan Carlos de la; Lüders, Carl; Sady, Henry; Guendelman, Tomás; Guendelman, Mario; Lindenberg, Jorge; Astudillo, Misael; Boroschek, Rubén
    Este artículo describe brevemente algunos resultados del análisis y diseño del edificio placa-técnica del nuevo Hospital Militar ubicado en la comuna de la Reina en Santiago. Dicho edificiocuenta con una superficie cercana a los 50 mil metros cuadrados. Por brevedad, se enfatizaúnicamente aquellos aspectos más novedosos de su diseño, entre ellos, el del sistema de aislaciónsísmica basado en el uso de aisladores elastoméricos. A la fecha, este edificio es el más grande quehaya sido proyectado con aislación sísmica en América Latina. Se discuten además aspectosgenerales de la modelación estructural del edificio y los resultados más importantes del análisisdinámico realizado. En particular, se comparan las respuestas para un modelo tridimensional deledificio con el supuesto de comportamiento lineal equivalente y no-lineal del sistema de aislación
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    Seismic analysis and design: current practice and future trends
    (1996) Ridel, R.; Llera Martín, Juan Carlos de la
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    Seismic Vulnerability Assessment of the Yungay's Historic Urban Center in Santiago, Chile
    (2022) Chiara Palazzia, Nuria; Barrientos, Marco; Sandoval, Cristián; Llera Martín, Juan Carlos de la
    In this paper, a modified empirical large-territorial-scale procedure to assess the seismic vulnerability of aggregate buildings in urban areas located within a highly seismic context is proposed. The methodology is applied to a group of unreinforced masonry (URM) aggregates located in the Yungay's historic center in downtown Santiago, Chile. This assessment was carried out by modifying and integrating a vulnerability-index-based procedure, a specific existing approach called first level macro-seismic method used to predict seismic damage and loss scenarios through fragility curves of structural components. The procedure was calibrated using the observed damage after the 2010 Chile earthquake in 292 URM structural units. The results of this new damage index for URM aggregate buildings are used to derive Probability Mass Functions (PMFs) of the different damage states and preliminary Empirical Fragility Functions (EFFs). To the best of the authors' knowledge, these EFFs are the first publicly available for aggregate Chilean URM buildings. This research and its results are the starting point for a more comprehensive study for assessing damage sce-narios and vulnerabilities of aggregate URM buildings in historic centers of older Chilean cities. These functions may be used in risk assessment, and are useful to prioritize possible future damage mitigation strategies and other processes involving this historical heritage. We foresee that these results could be at least partially applied to other historical urban areas in Chile, and perhaps other old Latin American cities located along the sub-duction convergence region between the Pacific and Continental plates, which were founded similarly.
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    Some fundamental aspects of torsionally coupled structures
    (2000) Llera Martín, Juan Carlos de la
    Buildings with coupled lateral and torsional motions are continuously cited as classical examples of structural damage during an earthquake. There is nothing intrinsically wrong with a coupledstructure that justifies such damage; rather, the problem is a poor estimation of the inelastic displacement demand of the resisting planes. Since, the three-dimensional inelastic behavior of a building is rarely used in the building design, approximate code procedures are used for estimating the demand. It is well recognized now that even for single-story structures, the inelastic seismic response is not amenable of being encapsulated into simple code-like rules. Consequently, one procedure for simplified analysis of such structures has been devised. This procedure is based on the use of an ultimate surface in the story shears and torque space. This surface is used in this paper to explain certain research results on the topic as well as to introduce some basic aspects of the inelastic behavior of torsionally-coupled structures. Two examples are presented in which these surfaces have been used in conjunction with a simplified structural model to compute the inelastic response of a base-isolated structure and a seven story reinforced concrete building.