装配式混合框架-偏心支撑结构抗震性能试验研究OA北大核心

The prefabricated eccentrically braced hybrid frame is an innovative structural system that cleverly combines eccentric bracing with a precast concrete column-steel beam hybrid frame.Three specimens were tested for seismic performance under low-cycle repeated loading,including two with eccentric bracing(called"eccentrically braced substructures")and one for comparison with a traditional hybrid frame.The experiments varied the nominal yielding shear force in the energy-dissipating link to study failure modes and seismic performance.Results show that,under horizontal seismic loading,plastic deformation in the eccentrically braced substructures mainly occurred in the link,with minor damage at the base of the columns,while other components mostly stayed elastic.Compared to the traditional hybrid frame,the eccentrically braced substructures exhibit significant improvements in load capacity,initial stiffness,and energy dissipation,with increases of at least 1.58 times,3.05 times,and 2.29 times,respectively.The nominal yield force in the link increases by 30％,and the corresponding load capacity and initial stiffness of the braced substructure increase by 10％and 8％respectively,and the displacement ductility coefficient remained consistent.The eccentrically braced substructure's ultimate load capacity calculation based on the virtual work principle showes a relative error within 11％.