Recommended modeling parameters and acceptance criteria for nonlinear analysis in support of seismic evaluation, retrofit, and design

Abstract

PrefaceIn September 2014, the Applied Technology Council (ATC) commenced a task order project under National Institute of Standards and Technology (NIST) Contract SB1341-13-CQ-0009 to conduct comprehensive review of the generalized component models published in the current ASCE/SEI standard and relevant research, and develop recommendations for improvement . The need for defining parameters for nonlinear force-deformation models for components, elements, or assemblies is identified as a high-priority research and development topic in NIST GCR 14-917-27 report, Nonlinear Analysis Study and Development Program for Performance-Based Seismic Engineering, (NIST, 2013b) which outlines a research and development program for addressing the gap between state-of-the-art academic research and state-of-practice engineering applications for nonlinear structural analysis, analytical structural modeling, and computer simulation in support of performance-based seismic engineering. Buildings (ASCE, 2014), is widely used by designers for evaluating and upgrading existing buildings. The component models in the current standard were developed for use in existing building analysis, but they have also become widely employed in new building analysis. The purpose of this report is to recommend broad improvements to seismic nonlinear modeling and acceptance criteria requirements for different structural systems. The current standard, ASCE/SEI 41-13, Seismic Evaluation and Retrofit of Existing List of Tables xxviiThis publication is available free of charge from: https://doi.org/10.6028/NIST.GCR.17-917-45 List of Tables Executive SummaryThis report presents recommended hysteretic relationships for use in nonlinear seismic analysis in support of performance-based seismic design and evaluation projects. The primary intended audience for this report are committee members engaged in the development of building code requirements for the use of nonlinear analysis in design, though individual engineers engaged in performance-based engineering projects may find the information presented herein useful.Nonlinear static and dynamic analysis are commonly used by engineers to assess the probable performance of existing buildings and to design major new buildings. The most comprehensive guidelines presently available for performing nonlinear seismic analysis are contained in ASCE/SEI 41-13, Seismic Evaluation and Retrofit of Existing Buildings (ASCE, 2014). This guidance includes recommended backbone shapes and control points that describe the envelope of hysteretic response of various structural elements when subjected to ramped, fully-reversed, cyclic loading protocols. Most of these backbone recommendations are based on data available in the mid-1990s. Substantial additional research has been conducted since that time, enabling the development of updated backbones and control points for steel braced frame and moment frame, reinforced concrete shear wall and moment frame, and masonry and wood shear wall structur...