Experimental study on seismic behavior of fully bolted steel die block joints with cruciform preforms
A kind of fully bolted steel die block joint with cruciform preforms was presented.In order to study the seismic performance of the joint,five joint specimens were designed with different beam end connection,column end connection,beam segment weakening form and the construction form of cruciform preforms.The low-frequency cyclic loading test of five joint specimens were conducted.The joint failure modes and slip condition in splice area were analyzed;the hysteresis curves,skeleton curves,ductility coefficient,energy dissipation capacity,rotational capacity and stiffness degradation of the joint were obtained.The results show that the failure modes of the joint specimens are plastic deformation of the splicing plate in splicing area and the through diaphragm in the cruciform preforms and the cracking of some welds in the core area.The hysteretic curves of the five joint specimens appear to be"Z-shape"with great area,implying their strong energy dissipation capacities.The displacement ductility coefficient of the five joint specimens exceeds 4 and the plastic rotation angle exceeds 0.03 rad,which meets the requirements of seismic code,reflecting good rotational capability and ductility The stiffness degradation with five joint specimens is obvious,but the descending gradient is gentle.Different connection forms of splicing area and different cruciform preform structures has some influence on the seismic performance of joints.Different beam weakening forms has few influence on the seismic performance of joints.
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