Design theory of earthquake-resilient prefabricated column foot joint with lateral force-resisting energy-consuming device

Abstract

Based on the design concepts of damage control and concentrated energy consumption of key energy-consuming components, this paper puts forward an earthquake-resilient prefabricated column foot joint. Expounds the structural composition, advantages and seismic design requirements of this new type column foot joint in detail. After comprehensively considering the mechanical mechanism of the column foot joint, the load-bearing capacity correction coefficient and the height ratio of lateral force-resisting shear member (LRSM) inflection point are introduced, and the design theory is established accordingly, including the dimension of LRSMs, the number of connecting bolts and the stiffness of connecting beams. The rationality and applicability of the proposed design theory are verified by 18 groups of 90 finite element models, and several test specimens. The research shows that the design theory proposed in this paper can accurately predict the yield load and initial stiffness of the new type column foot joint, and effectively control the bolt slip time and the connecting beam failure time. The new column foot joint designed according to this design theory has excellent bearing capacity and ductility. The plastic damage of this joint can be basically controlled on the lateral force-resisting energy-consuming device (LRECD), which has the premise of earthquake-resilient.