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原文传递 Sensitivity of Wood-Frame Shear Wall Collapse Performance to Variations in Hysteretic Model Parameters

题名：	Sensitivity of Wood-Frame Shear Wall Collapse Performance to Variations in Hysteretic Model Parameters
正文语种：	英文
作者：	Jeena R. Jayamon, M.ASCE1; Philip Line, P.E., M.ASCE2; and Finley A. Charney, Ph.D., P.E., F.ASCE3
作者单位：	1Graduate Research Assistant, Dept. of Civil and Environmental Engineering, Virginia Tech, 200 Patton Hall, Blacksburg, VA 24061. 2Director, Structural Engineering, American Wood Council, 222 Catoctin Circle SE Suite 201, Leesburg, VA 20175. 3Professor, Dept. of Civil and Environmental Engineering, Virginia Tech, 200 Patton Hall, Blacksburg, VA 24061 (corresponding author).
关键词：	Wood-frame shear wall structure; Analytical modeling; Hysteresis models; Nonlinear analysis; Seismic performance evaluation
摘要：	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 woodframe 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.
出版年：	2019
期刊名称：	Journal of Structural Engineering
卷：	145
期：	1
页码：	1-12