Analysis on Seismic Behavior of Different Constructions of Steel Frame Welded Connections

Connection constructions play a great role on improving ductility of steel frame structure and preventing brittle failure. In order to have a systematic and comprehensive comparison among different constructions of steel frame welded connections seismic behaviour and to know how constructions influence the seismic response and failure modes, efficient and accuracy finite element model of ABAQUS is used. Non-linear finite element model is proved correct and applicable due to existed quasi-static tests. Based on establishing nine different construction connection models, capacity, stiffness, hysteretic behaviour, degradation characteristics, fracture tendency index, failure mode and location of plastic hinges are discussed in depth comparing with standard type. The results show that: Shear region strength has significant impact on failure mode; The carrying capacity and stiffness of the weaken connections are not weakened too much and their hysteretic behaviour are stable; "Dog bone" type connection has problem of lateral stability; Connection of holes in web has better performance both on hysteretic behaviour and failure modes.