SEISMIC PERFORMANCE OF ENDPLATE CONNECTIONS BETWEEN STEEL BEAMS AND DOUBLE-SKINCOMPOSITE WALLS WITH BLIND BOLTS

In order to solve the problem of prefabricated construction between H-shaped steel beams and double-skin composite walls, an assembled endplate joint using slip-critical blind bolts (SCBBs) was proposed in this paper. Two full-scaled specimens were designed and fabricated for low cycle reciprocating loading test and FEM analysis. The deformation mechanism, failure modes, ultimate capacity, ductility, energy dissipation, and stiffness degradation of the joints were studied. The results indicate that the failure modes can be divided into beam buckling and column surface damage according to the different thickness of vertical H-beam flange. The hysteretic curve of the beam buckling joint shows full spindle shape, and the joint shows fine seismic performance with the column surface and infilled concrete approximately remaining undamaged. As for the column surface damaged joint, the circular yield surface formed on the steel plate under tension around the bolt hole and the infilled concrete was crushed. The beam-end rotation of the joint is mainly caused by the rotation of the joint area. This failure mode should be avoided in engineering design due to its low bearing capacity, serious stiffness degradation and poor energy dissipation capacity.