Recently experimental work on joist-to-ledger connections (Ayhan and Schafer 2019) have demonstrated a complex behavior involving limit states such as ledger flange buckling, stud web crippling, and fastener pull-out. Current design practices do not account for these limit states. To improve design recommendations and understanding of load transfer mechanisms, a robust finite element model for a joist-to-ledger connection was developed in ABAQUS and validated with existing experimental tests. additionally, experimental testing on the pull-out capacity of screw-fastened connections was conducted to accurately capture the fastener pull-out limit state in the finite element environment. Influence of other floor sheathing materials, fiber cement board and steel deck, on the moment-rotation stiffness and strength of this connection were also explored. Finally, this work enables predictions for both design and system-scale characterization in CFS construction.
This post was prepared by CFS-NHERI researcher and Ph.D. candidate at UMass-Amherst, Hernan Castaneda. Contact cfsrc “at” cfsrc.org or Mr. Castaneda for further information.