Study on Load-Slip Characteristic Curves of Perfobond Shear Connectors in Hybrid Structures

Abstract

Load-slip characteristic of shear connectors is the basis of connectors’ stiffness inputting in finite element analysis and load transfer study of shear connector groups. Based on three series and 24 groups large-scale experiments of perfobond strip shear connectors (PBL) and depended on the cutting-edge measurement techniques of distributed optical fiber sensors, mechanic characteristics and important influence factors were analyzed thoroughly, corresponding formula for ultimate bearing capacity of PBL connectors was suggested. Further load-slip characteristics under elastic limit and ultimate bearing state were induced, load-slip curve expression of PBL connectors under static complete loading was de-rived. The results show that the elastic limit load of PBL connectors in hybrid structures is about 0.35 times the ultimate bearing load, the yield load is about 0.7 times the ultimate bearing load. The complete load-slip curve of a PBL connector consists of a straight line branch in elastic phase and a curve branch following logarithmic distribution in nonlinear phase.