DOI: 10.17603/ds2-fxgz-fq13
title: Data for Nonstructural Design Requirements for Functional Recovery Performance, in Development of Recovery-Based Seismic Design Requirements for the 2026 NEHRP Provisions

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. These datasets are the product of work to support the development of the 2026 National Earthquake Hazards Reduction Program (NEHRP ) functional recovery design provisions. We proposed structural 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 (Blowes et al., 2025a). We also proposed nonstructural design requirements for functional recovery (Blowes et al., 2025b) by evaluating the probability of meeting recovery time targets set by the Building Seismic Safety Council. The design checks are performed at a new risk-targeted Functional Recovery Earthquake (FRER) that follows a similar structure to current ASCE 7 Chapter 12 life-safety requirements. These datasets provide key inputs and outputs (e.g., engineering demand parameters, component fragilities, safety-critical structural damage data, recovery time data) from the calculations underpinning the 2026 NEHRP functional recovery provisions.


description: This study aimed to propose nonstructural functional recovery design requirements and provide initial values for nonstructural design parameters, such as the nonstructural component importance factor for functional recovery, Ipfr. We also studied the impact of seismic qualification requirements on functional recovery performance. These nonstructural design requirements were assessed in conjunction with proposed structural design requirements that limit safety-critical structural damage in the 2026 NEHRP functional recovery provisions and at the risk-targeted Functional Recovery Earthquake (FREr). 

First, we developed models that meet the structural design requirements for functional recovery, including the drift limit and response modification coefficients for functional recovery (Δafr and Rfr, respectively). The design parameters Δafr and Rfr are based on values in Blowes et al. (2025), which were then capped based on committee judgement for different Functional Recovery Categories (FRCs). We used the Seismic Performance Prediction Platform (SP3) to simulate nonlinear responses using a generalized functional recovery design spectrum, Seismic Design Category Dmax,FRE. Mitigation measures and preparedness strategies required in the draft NEHRP functional recovery provisions vary by FRC, which was also captured in the simulation.

We then assessed the following functional recovery performance metrics:
1. Probability of exceeding functional recovery time targets, which vary by Functional Recovery Category
2. Impact of increasing the component importance factor for functional recovery, Ipfr, on performance
3. Impact of seismic qualification of equipment on performance
4. Probability of individual components impeding function at various functional recovery time targets

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). For each system, outputs are provided for buildings designed to meet the structural design requirements for FRC B, C, and D in the draft NEHRP functional recovery design requirements, as well as combinations of (1) seismic qualification requirements and (2) values of Ipfr ranging from 1.0 to 3.0. The output data includes the median engineering demand parameters, a list of fragility functions, and the probability of meeting the functional recovery time target for each recovery category and 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. Nonstructural Design Requirements for Functional Recovery Performance. Earthquake Spectra. In Review.