Equivalent Viscous Damping for Steel Moment-Resisting Frames with Cross-Laminated Timber Infill Walls
Publication: Journal of Structural Engineering
Volume 142, Issue 1
Abstract
In the direct displacement-based design method, energy dissipative capacity of structures can be represented by an equivalent viscous damping (EVD). A number of studies have been reported in the formulation of EVD for different structural systems and hysteretic models. In this paper, an EVD model is developed and calibrated for steel-timber hybrid structures, where cross-laminated timber (CLT) shear panels are used as an infill in steel moment-resisting frames (SMRFs). To develop the EVD model, 243 single-story, single-bay CLT-infilled SMRFs analytical models are subject to semi-static cyclic analysis. Different model parameters of the hybrid structure are varied: gap between CLT panel and steel frame, bracket (connection) spacing, CLT panel thickness and strength, and postyield stiffness ratio of steel members. The EVD of each model was computed from the hysteretic responses based on an area-based approach. The design of computer experiments and response surface methodology were utilized to formulate the desired relationship between coefficients of EVD-ductility law and the model parameters. In order to create displacement compatibility between the equivalent linear system and time history, an iterative nonlinear time history procedure is adopted to calibrate the EVD-ductility law of the models. As a result, a new EVD-ductility law is presented that can be used in a displacement-based design of the steel-timber hybrid structure.
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Acknowledgments
This research was supported through funding to the NSERC Strategic Network on Innovative Wood Products and Building Systems (NEWBuildS).
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Published In
Journal of Structural Engineering
Volume 142 • Issue 1 • January 2016
Copyright
© 2015 American Society of Civil Engineers.
History
Received: Sep 7, 2014
Accepted: Feb 26, 2015
Published online: Jun 10, 2015
Discussion open until: Nov 10, 2015
Published in print: Jan 1, 2016
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