| The self-centering braced ductile shear panel(SC-BDSP)steel frame structure is supported by the ductile shear panel brace to provide horizontal bearing capacity and lateral stiffness.The super-elastic properties of shape memory alloy(SMA)provide self-centering behavior after earthquake.Our research group has conducted in-depth research on SC-BDSP steel frame and achieved fruitful results.However,intensive research has not been conducted on the seismic design methods of such structures.Based on the energy and displacement,the energy-based plastic seismic design method and displacement-based seismic design method of SC-BDSP steel frame were proposed.Structural examples using the proposed methods were designed.The nonlinear time-history analysis of these examples was carried out,and the feasibility of the methods was verified.The research results of this paper can provide reference for improving the performance-based seismic design method of SC-BDSP steel frame,which has important theoretical significance and practical value.The main research work of this article is as follows:(1)Statistical analysis was carried out on the hysteresis curve of SC-BDSP steel frame with different parameters completed in the article [63],and the corresponding hysteretic energy correction coefficient of SC-BDSP steel frame structure was obtained.The recommended value of the hysteretic energy correction coefficient of SC-BDSP steel frame is given by data fitting.(2)Based on the assumed target displacement,yield mechanism and principle of energy balance,an energy-based plastic seismic design method of SC-BDSP steel frame was proposed,and the effect of higher modes was considered.(3)Based on the displacement spectrum obtained by the conversion of acceleration spectrum code of China,a displacement-based seismic design method considering higher mode effects of SC-BDSP steel frame was proposed.(4)Four structural illustrations considering the influence of number of floors and target ductility were designed respectively,the energy-based and displacement-based seismic design method proposed in this paper were used.(5)Twenty seismic waves were selected for each example according to the spectral acceleration at the main modal period after amplitude modulation.The maximum story displacement,maximum residual story displacement,maximum inter-story drift ratio and residual inter-story drift ratio of these examples were investigated through the nonlinear time-history analysis method.The reliability of the proposed methods is verified. |
