Abstract:

Due to its simplicity, the structural engineering profession has been using the nonlinear static procedure (NSP) or pushover analysis. While modeling the determination of the nonlinear properties and deformation capacities of each component in the structure should be determined. Pushover analysis is carried out for either user-defined nonlinear hinge properties or default-hinge properties, available in some programs based on the TBDY 2018 and ASCE 41-17 standards. While such documents provide the hinge properties for several ranges of detailing, programs may implement averaged values. The user needs to be careful; the misuse of default-hinge properties may lead to unreasonable displacement capacities for existing structures. This paper studies the possible differences in the results of pushover analysis due to default and user-defined nonlinear component properties. Single-span and tree story buildings are considered to represent for this study. The most effective parameters in plastic hinge properties are plastic hinge length and transverse reinforcement spacing. In this study, single-span and three-storey reinforced concrete structure was analyzed using the incremental equivalent earthquake load and pushover analysis methods. Capacity curves have been obtained as a result of the analysis performed on the building systems. The peak displacement amount calculated according to ASCE 41-17 was obtained more than the peak displacement amount calculated according to TBDY 2018 in the results of the analyzes. The amount of base shear force and floor shear forces calculated according to TBDY 2018 has been obtained more than ASCE 41-17. The variation of the results calculated according to TBDY 2018 and ASCE 41-17 depends on the amount of vertical load affected in the earthquake analysis, effective stiffness and plastic hinge properties.

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