Energy-based Seismic Design Method Of Steel Frame With Concealed Vertical Slit Reinforced Concrete Infill Walls Under Near-fault Earthquake

Partially-restrained Steel Frame with concealed vertical slit RC infill walls(PSRCW)is an innovative composite structure,which has excellent seismic behavior.The structure of PSRCW is mainly composed of Partially-restrained Steel frame with good deformation ability,concealed vertical slit RC infill walls and shear connectors.At present,the seismic mechanism of Partially-restrained Steel Frame with concealed vertical slit RC infill walls(PSRCW)structure have been studied deeply and achieved fruitful research results.However,the research on seismic design method has not been carried out.Based on the statistical analysis of the relevant experimental investigation and the ground motion record in the high intensity area,a new seismic design of Partially-restrained Steel Frame with concealed vertical slit RC infill walls(PSRCW)which based on the maximum effect cyclic energy(MECE)spectrum is proposed.A simplified computational expression of the maximum effective hysteresis energy dissipation in the main energy consuming components is established.The rationality and accuracy of the energy seismic design method based on the MECE spectrum of the PSRCW structure are analyzed by nonlinear time history analysis and fragility analysis.The design method of this dissertation is of great significance to perfect the relevant design method of PSRCW structure system.The primary content in this dissertation includes:(1)Based on the maximum effect cyclic energy(MECE)spectrum,multi-modal and energy balance,the seismic design of Partially-restrained Steel Frame with concealed vertical slit RC infill walls(PSRCW)is proposed and the design formula of main energy dissipation components with the maximum effect cyclic energy(MECE)spectrum is established;(2)An example of PSRCW structure is designed by using the method proposed in this paper,and considers the influence of the target ductility coefficient and the number of layers.Based on the energy seismic method of MECE spectrum,four PSRCW structural examples are designed.(3)Two sets of 40 near-field velocity pulsed seismic waves were selected by nonlinear time history analysis.The elastic time history analysis of four PSRCW structure examples is carried out to assess its abilities of Story drift,Story shear distribution patterns,Story residual displacement,Story residual displacement angles under rare earthquakes.The rationality of the energy seismic design method by nonlinear time history analysis is verified;(4)Based on performance index,modified the Park-Ang damage model and the incremental dynamic analysis(IDA)method of PSRCW structure.Four PSRCW examples are given the first cycle of spectral acceleration(SA),ground peak acceleration(PGA),and the seismic performance of the PSRCW structure.The seismic performance of the PSRCW structure is evaluated by the different performance levels(basic IO,medium failure LS,severe failure CP,collapse C).