Abstract
The objective of this paper is to validate the concept of utilizing a truss-element based finite element model for capturing the in-plane cyclic response of steel sheathed cold-formed steel (CFS) framed shear wall. The model is developed within the OpenSees finite element platform. Steel sheathed CFS shear walls show shear buckling of their sheathing as a tension field develops. This inelastic behavior of the shear walls is replicated by using the Pinching4 material for truss elements acting along the tension field. Importantly, the model employs beam-column elements for framing members, rotational springs for representing frame stiffness and vertical springs for modelling hold-downs. The wall models were calibrated using experimental data available for 0.030-in. and 0.033-in. steel sheet sheathed shear walls with 2:1 and 4:1 aspect ratios and 6-in., 4-in. and 2-in. fastener spacing at panel edges. The specimens were subjected to symmetric reverse cyclic displacement-controlled loading using the CUREE protocol. Comparison amongst the experimental and numerical models demonstrate a high degree of accuracy in the estimated shear strength and hysteretic response of the shear walls and as such has the potential to be an important building block towards modeling full structural systems constructed of cold-formed steel framing.
Type
Publication
CCFSS Proceedings of International Specialty Conference on Cold-Formed Steel Structures. 5, St. Louis, MO.
Notes: Wei-Wen Yu outstanding student paper award
