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Towards Quantifying Beneficial System Effects In Cold-Formed Steel Wood-Sheathed Floor Diaphragms

TitleTowards Quantifying Beneficial System Effects In Cold-Formed Steel Wood-Sheathed Floor Diaphragms
Publication TypeConference Paper
Year of Publication2014
AuthorsChatterjee A, Xiang Y, Moen CDennis, Arwade SR, Schafer BW
Conference Name2nd International Specialty Conference on Cold-Formed Steel Structures
Date Published11/2014
Conference LocationSt. Louis, MI
Abstract

Cold-formed steel wood-sheathed floor diaphragm system behavior is analyzed from a system reliability perspective. Floor systems consisting of oriented strand board (OSB), cold-formed steel (CFS) joists, tracks and screw fasteners are modeled using shell and spring elements in ABAQUS. (Dassault-Systems ())The models consider typical seismic demand loads, with careful treatment of light steel framing diaphragm boundary conditions and OSB sheathing kinematics, i.e., two sheets pulling apart or bearing against each other at an ultimate limit state, consistent with existing experimental results. The finite element results are used to build surrogate mathematical idealizations (series, parallel-brittle and parallel-ductile) for the critical system components. System reliability and reliability sensitivity, defined as the derivative of system reliability with respect to component reliability, are studied for these idealizations. These results represent mathematical upper and lower bounds to real system behavior, and are being used in ongoing research to codify beneficial diaphragm system effects.