Browsing by Author "Hube, M.A."

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    Seismic performance of squat thin reinforced concrete walls for low-rise constructions
    (2020) Hube, M.A.; María, H.S.; Arroyo, O.; Vargas, A.; Almeida, J.; López, M.; CEDEUS (Chile)
    Thin reinforced concrete (RC) walls with single layer reinforcement have been used for houses and buildings in several Latin American countries. Although some design codes include recommendations for squat thin walls in low-rise constructions, its seismic performance has not been validated adequately in past earthquakes. This article presents the results of an experimental campaign of nine full-scale specimens conducted to characterize the influence of the steel type, the reinforcement ratio, and the wall thickness on the seismic behavior of squat thin RC walls with single layer reinforcement. Both welded wire and deformed bars were used as web reinforcement. Experimental results are used to develop nonlinear models to assess the seismic behavior of a prototype two-story house with welded wire reinforcement and deformed bars by means of incremental dynamic analyses. The experimental results show that the type of steel has the largest influence on wall seismic performance. The numerical results suggest that RC walls with single layer reinforcement are suitable for housing applications up to two stories in high seismicity regions, particularly walls detailed with deformed bars.
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    Seismic Response of Reinforced Concrete Buildings in Concepcion During the 2010, Maule Earthquake
    (2012) Westenenk, B.; Llera Martin, Juan Carlos de la; Jünemann, R.; Hube, M.A.; Besa, J.J.
    This article describes the response of eight shear wall buildings that experienced severe structural damage in Concepcion during the February 27th, 2010 Chile earthquake. Damaged elements within the lateral forceresisting systems of the buildings were less than 10%, suggesting little inelastic redistribution. It was also localized mostly in shear walls of lower stories and in the first basement. The most affected structures were rather new buildings founded on soft soils and presenting some degree of vertical and/or horizontal irregularity. Key aspects to understand the observed damage are: geographical orientation, vertical and horizontal irregularities, boundary reinforcement detailing, axial loads, and brittle cyclic behaviour. Geometric and response building indices such as vibration periods and regularity indices were estimated for all buildings. Additionally, four critical structures are subjected to a building-code type analysis and results presented. It is concluded that current shear wall design provisions need to be revised.
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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.