Browsing by Author "Junemann, Rosita"

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    A statistical analysis of reinforced concrete wall buildings damaged during the 2010, Chile earthquake
    (2015) Junemann, Rosita; Llera Martin, Juan Carlos de la; Hube Ginestar, Matías Andrés; Cifuentes Lira, Luis Abdón; Kausel, Edgar E.; Pontificia Universidad Católica de Chile. National Research Center for Integrated Natural Disaster Management; Pontificia Universidad Católica de Chile. Department of Industrial and Systems Engineering
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    Seismic fragility assessment of medium-rise fishbone-type reinforced concrete wall buildings
    (2022) Echeverria, Maria J.; Junemann, Rosita; Liel, Abbie B.
    This paper presents a seismic fragility assessment of medium-rise reinforced concrete (RC) wall buildings, focusing on fishbone-type buildings with high wall densities and other features such as the presence of thin unconfined walls subjected to high axial loads and significantly larger ver-tical irregularities. Such buildings are typical of residential buildings in Chile and other seismic countries. To do so, finite element models of three index buildings with different levels of axial load representing this class of buildings were developed using the software DIANA. Nonlinear time-history analyses were performed to estimate the engineering demand parameters (EDPs) for each building through a multiple stripe analysis. Finding that existing component damage fragility models did not well capture the damage in these buildings, global and local EDPs were examined, recommending new damage limit states better aligned with the expected and previ-ously observed damage to this type of buildings, capturing their critical characteristics (i.e., thin unconfined walls, high axial loads, and flag-shaped walls). This study subsequently shows seismic fragility curves for the three index buildings using the proposed damage limit states. The fragility curves are similar for the same building, whether developed using local or global EDPs. On this basis, it can be concluded that the damage limit states proposed for either type of EDPs can be used to reliably obtain analytical fragility curves for medium-rise RC wall buildings with similar characteristics to those considered in this paper.
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    Three-dimensional behavior of a spherical self-centering precast prestressed pile isolator
    (WILEY, 2009) Junemann, Rosita; de la Llera, Juan C.; Besa, Jaime; Almazan, Jose L.
    A 3D analytical formulation of a precast prestressed pile (PPP) seismic isolator with top and bottom spherical rolling kinematic constraints is proposed. The PPP isolator was initially conceived its a low-cost seismic isolation (and foundation) system for housing units of low-income people. Since these Structures are usually located at sites with poor soil conditions, the PPP isolator also works its a foundation pile by connecting the superstructure with more competent soil layers. The non-holonomic nature of the rolling constraint is dealt with by a structural formulation. The proposed 3D formulation is validated by numerical results obtained from a previously proposed formulation for the 2D problem, and a contact finite element model in ANSYS (www.ansys.com). Other issues associated with the dynamic response of isolated structures with the PPP are also examined. such as expected response reductions, variation in the axial force of the central prestressed cable, and torsional response amplifications. Finally, guidelines to estimate the actual 3D response using 2D analysis results are investigated. Copyright (C) 2009 John Wiley & Sons, Ltd.