Browsing by Author "Parra, P. F."

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    Effect of lateral stiffness on expected economic losses in reinforced concrete shear wall buildings
    (2023) Cando, M. A.; Hube, M. A.; Parra, P. F.; Arteta, C. A.
    This research paper evaluates the effect of lateral stiffness on expected economic losses in reinforced concrete shear wall buildings designed following current Chilean standards, including DS60 and DS61. Economic losses were evaluated for a group of four 20-story archetype buildings located in Santiago, Chile. The methodology developed by the Pacific Earthquake Engineering Research Center was considered to estimate economic losses. The expected annual loss (EAL) and the present value (PV) of the losses in 50 years were used as measures of economic loss. A probabilistic seismic hazard analysis, which considered the seismicity of central Chile, was performed to estimate both metrics. The results show that when the lateral stiffness of the building increases, the EAL also increases. This implies that stiffer buildings are more vulnerable from an economic point of view. This counter-intuitive finding results from the higher seismic hazard of stiffer buildings and the minimum design base shear required by DS61 that governed the design of the studied buildings. Additionally, it was found that the EAL and the PV of losses in 50 years for the four archetypes do not exceed 0.3% and 7.8% of the total construction cost of the buildings, respectively. These monetary losses are relatively low, which is consistent with the outstanding seismic performance of reinforced concrete shear wall buildings.
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    Effect of stiffness on the seismic performance of code -conforming reinforced concrete shear wall buildings
    (2020) Cando Loachamin, Manuel Antonio; Hube Ginestar, Matías Andrés; Parra, P. F.; Arteta, C. A.
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    Enhancing seismic performance of reinforced concrete dual wall-frame buildings: Integrating alternative modeling and design approaches
    (2025) López Machado, Nelson Andrés; López-Garcia González, Diego; Parra, P. F.; Araya Letelier, Gerardo Andrés
    This study delves into two critical issues related to the seismic analysis and design of Chilean reinforced concrete dual wall-frame buildings. First, it evaluates the efficacy of Special Boundary Elements (SBEs) in shear walls, whose seismic performance enhancement remains uncertain despite recent (i.e., after the 2010 earthquake) mandates in Chile. Second, it investigates the relevance of explicit inclusion of slabs in 3D nonlinear models (in dual wall-frame buildings slabs are often not modeled for computational expediency). Various analytical models of a representative 16-story dual wall-frame archetype building are meticulously evaluated using Perform3D. Different vertical heights of the SBEs (ranging from 0 to 5 stories) and different values of the effective flexural stiffness of the slabs (ranging from 0 to 100% of the gross cross-section stiffness) are considered. Subduction ground motions representative of the Chilean seismicity are selected and scaled based on detailed seismic hazard analyses. Evaluation metrics include collapse fragility functions and 50-year collapse probabilities. Inelastic deformations in the shear walls are thoroughly analyzed. It was found that the effective flexural stiffness of the slabs has a non-negligible influence on the analytical collapse probability, and that SBEs do not provide ductility but they do reduce the collapse probability.
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    Enhancing seismic performance of reinforced concrete dual wall-frame buildings: Integrating alternative modeling and design approaches
    (HUMANA PRESS INC, 2025) López Machado, Nelson Andrés; López-Garcia González, Diego; Parra, P. F.; Araya Letelier, Gerardo Andrés
    This study delves into two critical issues related to the seismic analysis and design of Chilean reinforced concrete dual wall-frame buildings. First, it evaluates the efficacy of Special Boundary Elements (SBEs) in shear walls, whose seismic performance enhancement remains uncertain despite recent (i.e., after the 2010 earthquake) mandates in Chile. Second, it investigates the relevance of explicit inclusion of slabs in 3D nonlinear models (in dual wall-frame buildings slabs are often not modeled for computational expediency). Various analytical models of a representative 16-story dual wall-frame archetype building are meticulously evaluated using Perform3D. Different vertical heights of the SBEs (ranging from 0 to 5 stories) and different values of the effective flexural stiffness of the slabs (ranging from 0 to 100% of the gross cross-section stiffness) are considered. Subduction ground motions representative of the Chilean seismicity are selected and scaled based on detailed seismic hazard analyses. Evaluation metrics include collapse fragility functions and 50-year collapse probabilities. Inelastic deformations in the shear walls are thoroughly analyzed. It was found that the effective flexural stiffness of the slabs has a non-negligible influence on the analytical collapse probability, and that SBEs do not provide ductility but they do reduce the collapse probability.
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    Fragility-based analysis of the influence of effective stiffness of reinforced concrete members in shear wall buildings
    (2020) Ugalde Bedoya, David Guillermo; López-García González, Diego; Parra, P. F.
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    Overstrength of 3D fully modeled RC shear wall buildings
    (2018) Ugalde Bedoya, David Guillermo; Parra, P. F.; López-García, D.
    Many reinforced concrete shear wall buildings subjected to the Mw 8.8 2010 Chile earthquake suffered no damage even though they were subjected to seismic demands significantly larger than the design strength. Analytical studies previously conducted by the authors on undamaged buildings, however, showed that linearly elastic demands due to ground motions recorded during the 2010 Chile earthquake exceed the capacity of many walls. This dichotomy between empirical evidence and results given by linear analysis highlights the need for non-linear analysis to accurately assess the strength of wall buildings. In this paper, an actual wall building not damaged by the 2010 Chile earthquake is analyzed with non-linear techniques to assess the amount of overstrength and to evaluate the response to the 2010 Chile earthquake. Non-linear pushover and time history analyses were performed. Results given by pushover analysis indicate large values of overstrength (greater than 3.4) that are very sensitive to the shear stiffness of the walls and to soil-structure interaction, but not to other modeling issues. The global response of the building is essentially unaffected by damage up to a roof drift ratio roughly equal to 0.004, which is similar to the roof displacement demand imposed by the recorded ground motions. When the rigid body rotation is accounted for, interstory drift ratios obtained from time history analysis are smaller than immediate occupancy limits, which is consistent with the actual lack of damage. It is then concluded that non-linear analysis is indeed necessary to realistically analyze the response of reinforced concrete shear wall buildings subjected to large seismic demands, even of those that remained undamaged.