NUMERICAL AND EXPERIMENTAL STUDIES OF WOOD SHEATHED COLD-FORMED STEEL FRAMED SHEAR WALLS
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Date
2014-08-15
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Johns Hopkins University
Abstract
This thesis presents phase one of a project with the objective of exploring the impact of non-conventional detailing of wood-sheathed, cold-formed steel (CFS) framed, shear walls. The work shown herein includes the development and validation of a high fidelity shell finite element model and the preparation for future full-scale shear wall testing. Current design of wood sheathed CFS framed shear walls relies on deformations and associated ductility at the frame-to-sheathing connections (see e.g. AISI S213-12). Prescriptive requirements and capacity-based design principles are utilized to insure the desired limit state. Reliability of this complex subsystem has not formally been evaluated based on the potential limit states. Further, the desire for connections to be the controlling limit state is contrary to general design, where connection reliability employs a higher reliability index β (typically 3.5) than member reliability (β typically 2.5). A high fidelity shell finite element model is developed in ABAQUS for prediction of lateral response of wood-sheathed CFS framed shear walls. CFS members and sheathing panels are modeled with shell elements, sheathing-to-frame fasteners are modeled with nonlinear spring elements, and hold-downs are modeled as bi-linear springs. The walls are subjected to either monotonic or cyclic (CUREE protocol) lateral loading by displacement-based analysis. The model is validated against available testing and is demonstrated to be able to recreate the full-scale tests. Along with the numerical study, the preparation for future full-scale shear wall tests including the design of testing rig, development of sensor plan, material tensile testing, and assembly of preliminary test specimen were also conducted. Phase two of the project, which involves the parametric study of various unconventional shear walls using the developed modeling protocol and non-conventional full-scale shear wall testing, is now underway.
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Keywords
Numerical, experimental, Wood Sheathed, Cold-Formed Steel, Shear Wall, Modeling