Seismic Performance of Joint with Replaceable Perforated-flange Beam Segment

XIONG Xiaoli; LI Feiping; ZHANG Yu; HAI Chuang

doi:10.15926/j.cnki.issn1672-6871.2025.01.009

Abstract：To achieve the outward displacement of plastic hinges under seismic action and the rapid repair of post-earthquake structures,a joint with replaceable perforated-flange beam segment was proposed.Experiments were conducted on the joint with replaceable perforated-flange beam segment under low-reversed cyclic loading to study the seismic performance of the joint.The hysteresis curve,skeleton curve,ductility coefficient,equivalent viscous damping coefficient curve,and stiffness degradation curve of the joint were obtained.Additionally,a variable parameter analysis of the perforated diameter with different beam-column cross-sectional dimensions was performed by finite element software.The results indicate that the joint allows for the outward displacement of the beam end plastic hinge to the weakened place of the perforated-flange,and exhibits good bearing capacity,ductility,and rapid repair capability after earthquake.With the increase of the perforated diameter,the ductility,energy dissipation capacity,and stiffness of the joint gradually decrease,but all still meet the seismic performance requirements.It is recommended that the degree of perforated weakening is 0.20～0.35.After changing the beam-column cross-sectional dimensions,it is found that if the degree of perforated weakening is maintained between 0.20～0.35,the joint with replaceable perforated-flange beam segment in different beam-column cross-sectional dimensions can still meet the seismic performance requirements,and the ultimate load capacity is reduced by no more than 10%.