Morales González, Merangelí

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    Characterization of the seismic response of RC frames at different performance levels established in the ASCE 41-06 seismic rehabilitation code
    (2013) Morales González, Merangelí; Vidot Vega, Aidcer L.; College of Engineering; Suárez Colche, Luis E.; Guevara Guillén, José O.; Department of Civil Engineering; Portela, Genock
    Performance-based earthquake engineering is focused in the definition of limits states to represent different levels of damage, which can be described by material strains, drifts, displacements or even changes in dissipating properties and stiffness of the structure. This study presents a research plan to characterize the behavior of Reinforced Concrete (RC) moment resistant frames at different performance levels established by the ASCE 41-06 seismic rehabilitation code. A total of 16 RC special moment resisting frames (2D) with different aspect ratios (L/H) and one 3D RC frame were analyzed in order to evaluate the seismic behavior of the structure at different performance levels. The design guidelines used were taken from the ACI 318-08 and ASCE 7-05 building codes, which are the design guidelines used for United States constructions. For each aspect ratio, four longitudinal steel reinforcement ratios for the beams that varied from 0.85% to 2.5% were used. For columns the steel reinforcement ratio used was determined using the methodology presented in ACI 318-08. All 2D frames were subjected to seven compatible earthquakes and scaled to accelerations ranging from 0.1g to 1.5g (105 cases for each frame) obtained from the Pacific Earthquake Engineering Research (PEER) database. The 3D frame was subjected to four ground motion of increasing intensity levels. These ground motions were applied in sequence to the frame. The frames were analyzed using the program OpenSEES (Open System for Earthquake Engineering Simulation). As part of this research the impact of the aspect ratios and geometry at different performance levels and their contribution on the structural frames damage were evaluated. In addition, the relationship between material strains and energy dissipation changes for the different performance levels was studied. The goal is to characterize the seismic behavior of RC frames to improve the currently available design assessment techniques and damages limit states.