A PUSHOVER-BASED METHODOLOGY FOR THE SEISMIC VULNERABILITY ASSESSMENT OF LOW-TO MIDRISE REINFORCED CONCRETE STRUCTURES

Date

2023-12-11

Author

Aydın, Mehmet Fırat

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The vulnerability assessment of structures under earthquake excitation is one of the key factors in determining the seismic resilience of a region. Generally, the response of equivalent single degree of freedom systems representing the characteristics of the interested building stock is analyzed by performing nonlinear time history analysis to minimize the computational effort. However, this analytical approach requires a considerable number of assumptions and simplifications to reflect the parameters that affect the behavior of the structure of the model which creates epistemic uncertainty. In this study, an alternative methodology is proposed for rapid vulnerability assessment of low to midrise reinforced concrete structures. Firstly, representative 3D structural models are created concerning the number of stories, year of construction, and occupancy class (residential or non-residential) as well as structural deficiencies like the presence of heavy overhang, soft story, short column, plan, and vertical irregularity. In total, 4768 subclasses have been defined for low to midrise reinforced concrete structures with different characteristics and deficiencies. Secondly, static pushover analysis is conducted to obtain the idealized capacity curves which represent fundamental nonlinearity parameters of the structural system such as ductility demand, post-yield stiffness ratio, etc. together with dynamic modal properties of the system. Then, statistical approaches are implemented by using the outputs of the generated database to predict the parameters of idealized capacity curves of every low to midrise reinforced concrete structure rather than creating structure-specific models and performing static nonlinear procedures. In this manner, one can easily perform the capacity spectrum method by using generated capacity curves or perform an idealized single degree of freedom nonlinear time history analysis by using hysteretic relationships with predicted nonlinearity parameters. The generated algorithm can be implemented for a much larger domain of low to midrise reinforced concrete structures including the defects that cause most of the observed damage after severe earthquakes. This study attempts to decrease the computation time significantly together with increasing the modeling accuracy for the regional seismic vulnerability assessment procedures.

Subject Keywords

Reinforced Concrete Structures, Structural Dynamics, Pushover Analysis, Idealization of Capacity Curves, Risk Assessment

URI

https://hdl.handle.net/11511/108207

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Graduate School of Natural and Applied Sciences, Thesis