Sensitivity of Wood-Frame Shear Wall Collapse Performance to Variations in Hysteretic Model Parameters
Publication: Journal of Structural Engineering
Volume 145, Issue 1
Abstract
This paper presents a numerical investigation of the influence of varying three parameters of the cyclic analysis of shear walls in wood-frame structures (CASHEW) 10-parameter wood-frame shear wall hysteretic model that have distinctly different effects on the shape of the backbone curve. The purpose is to assess the sensitivity of wood-frame shear wall collapse performance to changes from the baseline assumptions used to validate the FEMA P695 collapse performance methodology. The variations in backbone curve shape are intended to reflect observed variations in experimental response due to test methods, test boundary conditions, and shear wall aspect ratio. The paper also investigates the influence of including P-delta effects and the use of assumed equivalent viscous damping of 5% of critical. The baseline assumptions exclude P-delta effects and use 1% damping. A total of 126 unique analyses are conducted for six of the FEMA P695 wood-frame shear wall index models ranging from two to five stories. The results show that improved collapse performance (increased adjusted collapse margin ratio) occurs for hysteretic model assumptions that reduce (less negative) postpeak stiffness, increase displacement at peak strength, and increase peak strength intercept. These hysteretic model changes produce improved collapse performance for cases modeled with and without P-delta and for cases modeled with 1% and 5% damping. The inclusion of P-delta effects reduces adjusted collapse margin ratio by an average of 10% relative to the without-P-delta baseline. Use of 5% damping in these models improves adjusted collapse margin ratio by an average of 13% relative to the 1% damping baseline.
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Acknowledgments
The authors thank the financial support and guidance provided by the American Wood Council (AWC) for the completion of the work presented in this paper. The authors also thank Prof. Andre Filiatrault for supplying background information from the ATC-63 project. The authors also thank Dr. Ioannis Christovasilis for supplying the hysteretic parameters for each of the index models used in this research. The authors also thank the initial efforts and directions provided by Dr. Francisco Flores in the analysis presented in the paper and Virginia Tech graduate students Logan Perry and Eduardo Naranjo for analysis of select index models presented in the paper.
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Published In
Journal of Structural Engineering
Volume 145 • Issue 1 • January 2019
Copyright
©2018 American Society of Civil Engineers.
History
Received: Sep 1, 2017
Accepted: Jun 4, 2018
Published online: Nov 10, 2018
Published in print: Jan 1, 2019
Discussion open until: Apr 10, 2019
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