Browsing by Author "Quizanga Martínez, Diego Marcelo"

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    Bloque deslizante para aisladores sísmicos del tipo friccional; aislador sísmico del tipo péndulo friccional (Chile, concesión n° 70724)
    Almazán Campillay, José Luis; Auad Álvarez, Gaspar Andrés; Quizanga Martínez, Diego Marcelo
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    Seismic performance of timber buildings retrofitted with hybrid walls and impact-resilient isolators
    (Elsevier Ltd., 2025) Quizanga Martínez, Diego Marcelo; Almazán Campillay, José Luis; Torres-Rodas, P.; Guindos Bretones, Pablo
    Light-frame timber buildings (LFTBs) are widely used in seismic regions due to their ease of assembly and the availability of pre-qualified structural elements. However, LFTBs are susceptible to collapse mechanisms such as soft-story failures during extreme events. Different studies have focused on increasing the LFTB's lateral force-resisting system capacity to address this vulnerability by constructing hybrid elements combining wood with other materials. Although these hybrid buildings are more resistant to seismic forces, they have exhibited large floor accelerations. On the other hand, frictional seismic isolation has demonstrated its efficiency in protecting LFTBs and reducing their floor accelerations. However, during extreme earthquakes, an impact between the perimeter ring of the isolators and the sliders can occur, reducing the effectiveness of seismic isolation. In response to this phenomenon, this paper evaluates the seismic performance of archetype buildings, representative of the Chilean real estate sector, subjected to extreme ground motions capable of inducing impact. The analysis includes retrofitted LFTBs after incorporating hybrid walls and recently developed Impact-Resilient Double Concave Frictional Pendulum (IR-DCFP) bearings. Considering the isolators remain functional under extreme displacements and the FEMA P695 methodology, incremental dynamic analyses of nonlinear models were conducted to obtain the collapse margin ratio of each archetype and, subsequently, their fragility curves. Results indicated that incorporating hybrid walls and IR-DCFPs reduced the LFTB's probability of collapse at the Maximum Considered Earthquake level by up to 35 %, even considering a low wall density and the use of compact bearings. These findings suggest that IR-DCFPs combined with hybrid walls offer a cost-effective solution for improving the seismic resilience of LFTBs in high-seismicity regions.
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    Shake table testing for system effects analysis in a 1:2 scale three-story light frame timber building
    (Sage Journals, 2025) Valdivieso Cascante, Diego Nicolás; Quizanga Martínez, Diego Marcelo; Almazán Campillay, José Luis; López-García González, Diego; Liel, Abbie; López, Nicol; Hernández, Francisco; Guindos Bretones, Pablo
    This study investigates the impact of system effects on the dynamic behavior of light frame timber buildings (LFTBs) through shake table tests and numerical analysis. Here, the term “system effects” encompasses the influence of the transverse shear walls, the out-of-plane bending stiffness of the diaphragms, and the gravity load, particularly in LFTBs with non-planar shear walls. The findings of this research reveal that system effects notably reduce story drift demands and enhance the lateral stiffness and damping ratio of LFTBs with respect to results from numerical models that do not consider component interactions. This observation highlights a discrepancy between the actual lateral stiffness and that predicted by existing models, particularly at relatively small levels of story drift. The underestimation of these engineering parameters is more apparent at the lower stories, underscoring the significant role of the gravity load in amplifying the beneficial effects of the transverse shear walls and the out-of-plane bending stiffness of the diaphragms. These insights are vital to refine the seismic design and analysis of LFTBs and underscore the importance of incorporating system effects into both numerical and analytical models. This enhanced understanding of component interactions in LFTBs sets the stage for increasing adoption of LFTBs as a sustainable and resilient building solution in earthquake-prone areas.