SEISMIC BEHAVIOR OF STEEL MOMENT RESISTING FRAMES ASSOCIATED WITH RC SHEAR WALLS

In this paper, the influence of increasing the height of building on the seismic behavior
of dual structural systems in the form of steel moment resisting frames accompanied with
reinforced concrete shear walls has been investigated. Common structures experience inelastic
stage of behavior encountering the seismic loads and the applied energy will be dissipated. The
nonlinear responses of the structural models have been evaluated in this research. As a result, some
parameters such as ductility factor of structure (μ), over-strength factor (Rs) and response
modification factor (R) for the mentioned structures have been studied. To achieve these
objectives, the buildings have 10 and 20 stories and contain such structural systems used to
perform the pushover analyses having different load patterns. Regarding the results, it seems that
the response modification factor (R) for the mentioned structural system is assumed to be higher
than the value which is used in Iranian Code of Practice for Seismic Resistant Design of Buildings
[Standard No.2800]. Analytical results showed that the ductility factor and the response
modification factor increased as the structure height increased. In contrast, the over-strength
factors increased by decreasing the height of the structure.