Argente del Castillo Garrido, Adrián

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    Evaluation of RC wall and frame systems under beyond design accelerations including aging effects
    (2018) Argente del Castillo Garrido, Adrián; Vidot Vega, Aidcer L.; College of Engineering; Suárez, Luis E.; Montejo Valencia, Luis A.; López Rodríguez, Ricardo R.; Department of Civil Engineering; Rodríguez Abudo, Sylvia
    Nuclear power plants and other civil structures in the world have recently experienced strong ground motions exceeding the original design values. The evaluation of the capacity of structural systems in a nuclear power plant and other civil structures under beyond design accelerations is important to address the level of seismic damage that they can safely manage. This thesis evaluates the impact of beyond design earthquake accelerations in the response of typical RC buildings with and without considering aging effects of the reinforcing steel. Typical RC buildings are composed of frames and walls that are designed to resist the lateral loads during a seismic event. Nonlinear dynamic analyses of RC dual wall-frame systems are performed under the effects of beyond design seismic accelerations using OpenSees. Walls are modeled using the cyclic shear-flexure interaction model and the reinforced concrete elements in the frame are modeled using the beam with hinges element and constitutive relationships for concrete and reinforcing steel available in OpenSees. Dynamic analyses of the RC wall- frame dual system with and without aging effects are performed under different earthquake scenarios. Displacement capacities, shear strengths, displacement limit states are evaluated for different earthquake magnitudes. I was found that the stiffness of the structure degrades more significantly as the design condition is exceeded. The initial stiffness of the system has the most pronounced change as the moment magnitude increases. Moreover, the degradation in peak shear capacity follows a constant pattern and do not precisely depends on the exceedance of the design condition. Finally, the model including the reduction in steel due to aging presents higher deformations, less stiffness and more nonlinearity, affecting more the shear strengths at limits states.