MacRae 2008
In this paper a number of issues related to the design of structures subjected to earthquake excitation were explained. Slab effects on moment frame joints, slab overstrength effects on steel moment connections, low cost damage free steel joints, the quantification of drift concentrations in steel framed structures and the quantification of building torsional effects by means of impulse loading were discussed.
System Concept
For SHJs, the beam top flange is connected to the column by means of a top flange plate; therefore rotation of the beam end occurs about the connection of the top flange plate to the column flange. The shear force in the beam is carried by the top web bolts. Horizontally slotted holes are provided in the bottom flange plate and in the bottom of the column web plate to allow significant rotations of the beam end relative to the column face.
DSFDs can be used within or at the end of the braces to dissipate energy. In the connections between gusset plate to beam and floating plate to brace, elongated bolt holes were used, providing large deformation capacity. This system experiences no significant damage, with the same properties in each direction. Moreover, the system is able to self-center and the bolted floating plate can be replaced after yielding.
Results
SHJs can dissipate energy and be replaced after yielding more easily than other fuse systems; moreover, DSDFs foster a damage-free system with SCs and can also be replaced.
Reference
MacRae, G.A. (2008). “A New Look At Some Earthquake Engineering Concepts,” Report from the University of Canterbury, Christchurch, New Zealand.