DOI: 10.17603/ds2-4dgx-kn84
title: Data for Limiting Safety-Critical Structural Damage in Recovery-Based Seismic Design Provisions, in Safety-Critical Structural Damage in Recovery-Based Seismic Design

description: In the move toward design practices that facilitate recovery, there are ongoing efforts to reevaluate structural seismic design parameters such as design drift limits and response modification coefficients. This dataset is the product of work to support the development of the National Earthquake Hazards Reduction Program (NEHRP ) 2026 functional recovery design provisions, where we proposed design requirements that limit the occurrence of safety-critical structural damage, i.e., damage that must be repaired for occupants to return to a building safely. In this work, we outline structural design checks to be performed at a new risk-targeted Functional Recovery Earthquake (FRER) that follows a similar structure to current ASCE 7 Chapter 12 life-safety requirements.
description: 
 We developed a methodology that uses the probability of safety-critical structural damage as the performance objective for determining structural design requirements for functional recovery, including the drift limit and response modification coefficients for functional recovery (Δafr and Rfr, respectively). In this methodology, structural analysis models are designed using a generalized functional recovery design spectrum, Seismic Design Category Dmax,FRE. We then assess component damage using FEMA P-58 and calculate the probability of safety-critical structural damage using the red-tag algorithm in the ATC-138 methodology (Cook et al., 2022). Finally, acceptable values of Δafr and Rfr are determined based on a target probability of safety-critical structural damage.

We applied this methodology for a wide range of conventional lateral force-resisting systems. We used the Seismic Performance Prediction Platform (SP3) to perform the FEMA P-58 and ATC-138 calculations . This dataset includes the fragility functions we used in our assessment, including damage state to safety-class mapping for the ATC-138 calculations. We also provide the Dmax,FRE and Dmax,DE design spectra. 

The dataset includes outputs of the simulations performed in SP3 for reinforced concrete shear walls, buckling-restrained braced frames, and steel and reinforced concrete moment frames, and for a range of building heights (i.e., 3-24 stories) and gravity system combinations (i.e., post-tensioned slabs, reinforced concrete slabs, and steel frames). For each system, outputs are provided for buildings that meet combinations of functional recovery drift limits (Δafr) ranging from 0.5%-2.0% and response modification coefficients (Rfr) ranging from 1.0 to the current ASCE 7 values. The output data includes the median engineering demand parameters, a list of fragility functions, and the probability of safety-critical structural damage for every system and design combination explored in our companion paper whose pre-print is available with this dataset. 

Blowes, K., Molina Hutt, C., Zimmerman, R., Cook, D., Almeter, E., Haselton, C., 2025. Limiting safety-critical structural damage in recovery-based seismic design provisions. Earthquake Spectra. In Review.