Seismic performance of castellated beam-to-column end-plate joints with dual hinge mechanism
In this paper,a castellated beam-to-column end-plate(CBE)joint was proposed to address the problem of brittle fracture of welds caused by high stresses in solid web beam-to-column end-plate connections and the development of plastic deformations in frame beams.Cyclic loading tests of 12 CBE joints were conducted to investigate the effects of floor,end-plate and opening parameters on the failure mode and hysteresis performance of the joints.The development of plasticity and the dual hinge failure mechanism of CBE joints were clarified.It is shown that the dual hinge failure mechanism is superior to the plastic hinge failure mechanism of the end-plate.A larger opening rate allows the beam to form a plastic hinge earlier than the connection,thus protecting the joint zone.Compared with solid-web joints,CBE joints demonstrate larger plastic deformation capacities(improved by about 14％)and smoother stiffness degradations.The ductility coefficient and energy consumption of the joints are 42％and 30％higher than those of solid-web joints,respectively.In addition,a calculation method for the bending bearing capacity of CBE joints was proposed.The calculation results are in good accordance with the experimental results and finite element analysis results.
castellated beamend-plate jointquasi-static testdual hinge mechanismseismic performance
万方数据
维普
