Browsing by Author "López-García, D."

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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.
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    Study on Partial Collapse of a Five Story Reinforced Concrete Building during the 2010 Chile Earthquake
    (2012) Hube, M.A.; Vizcaíno, P.; López-García, D.; Llera Martin, Juan Carlos de la
    After the 2010 Chile earthquake about 20 reinforced concrete (RC) buildings were declared inhabitable and four buildings faced demolition order within the city of Santiago, which is located more than 300 km away from the epicenter. The objective of this paper is to present the main findings of, and the lessons learned from, a preliminary study on the partial collapse of a 5-story residential building. To achieve this goal, the seismic design of this building was verified using the response spectrum method following the Chilean seismic design code at the time of the earthquake. The building was designed with a mixed RC and confined masonry structure; however the parking level was structured mostly with RC in order to maximize parking spaces. It is concluded that: (1) walls at the basement level had inadequate demand/capacity ratios, (2) confinement requirements in RC walls needs to be revised, and (3) vertical irregularity must be incorporated in Chilean code.