Calculation method of seismic response for steel frame coupled with rocking structure and dampers
Steel frame coupled with rocking structure and dampers(SRF)achieves superior seismic behavior under earthquake excitation,with nonuniform inter-story drift restrained by rocking truss structure and inputting-energy dissipated by dampers located around rotational point.The elastic calculation method of SRF was deduced.The equivalent model of single degree of freedom(SDOF)was established for SRF and the evaluation method of nonlinear seismic response for SRF was promoted by equivalent linearization method.Meanwhile,the ductility demand spectra under three types of earthquake records recommended by ATC-63 was developed based on time-history dynamic analysis results.Results show that the elastic calculation method can be used to calculate the structural response of SRF under lateral loads.Structural mechanism and nonlinear seismic response under earthquake excitation can be accurately evaluated by the equivalent model of SDOF and the seismic response of actual structure can be predicted by the deduced seismic response calculation method of SRF.Ductility demand spectra for SRF obtained by SDOF is appropriate to the fact that post-yield ratio of SRF is greater than that of the steel-frame structures,which can be referred in the practical design.
rocking structuredamperseismic responseequivalent model of single degree of freedomductility demand spectra
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