Gregory G Deierlein

Gregory G Deierlein
Stanford University | SU · Department of Civil and Environmental Engineering

About

210
Publications
95,193
Reads
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8,191
Citations
Additional affiliations
September 1998 - present
Stanford University
Position
  • J.A. Blume Professor of Engineering

Publications

Publications (210)
Article
Full-text available
In this paper, the effect of Lode angle on the fracture strain of steels is discussed based on experimental evidence. To isolate the effect of the Lode angle, fracture strains corresponding to stress states with constant stress triaxiality but variable Lode angle parameters are obtained from both the literature and tests performed in this study of...
Poster
Full-text available
High-fidelity testbeds provide researchers and practitioners with realistic regional hazard and exposure information that can be used for benchmarking new risk and recovery models and supporting educational efforts. Few such testbeds currently exist because gathering and preparing the necessary data has traditionally been a laborious task with limi...
Conference Paper
Full-text available
This paper highlights two important areas where substantial improvements are needed to support the expansion of computational disaster simulation to enable quantitative investigation of broad impacts on communities and the recovery of cities after earthquakes. The natural hazards engineering community needs i) robust and standardized workflows for...
Conference Paper
Full-text available
Many tall office buildings in high seismic areas along the west coast of the United States rely on older, seismically deficient, welded steel moment frames (WSMFs) of the kind that experienced sudden brittle fractures during the 1994 Northridge earthquake. Despite the known vulnerability of these buildings, policymakers lack robust and reliable met...
Conference Paper
Full-text available
The paper presents analytical seismic fragility functions developed for low-/mid-/high-rise reinforced concrete moment frames abundantly found in the modern building stock of Pakistan. To date, frames were designed in accordance to the national seismic code of Pakistan (BCP-SP 07) that is largely based on the UBC-97, however, variability is observe...
Conference Paper
Full-text available
Assembling a building inventory for a high-resolution regional seismic risk assessment from publicly available data is a laborious task with several challenges due to the disparate nature of publicly available structural and demographic information. The authors developed an open-source framework for inventory generation and proposed a standardized...
Article
Full-text available
The exponential function to simulate the damaging effects of void growth has been widely used in fracture initiation models to describe the effect of stress triaxiality on the fracture strain of ductile metals. Its validity has largely been demonstrated for loading conditions with high stress triaxiality, but there are comparatively fewer tests to...
Article
Full-text available
The widely used incremental dynamic analysis (IDA) offers attractive efficiencies to organize and conduct nonlinear dynamic structural analyses under earthquake ground motions. However, its use of a fixed ground motion set limits its ability to resolve ground motion characteristics that vary based on location and intensity. To overcome this limitat...
Article
A framework is proposed to assess the impact of safety cordons on the recovery of community functions after an earthquake, using high-resolution geospatial information to simulate the damage, cordons, and recovery trajectories for buildings in the affected area. Ground motion maps are developed to characterize shaking intensities for regional build...
Article
Damage mechanics continuum criteria have been shown to provide an effective alternative to conventional fracture mechanics parameters to simulate ductile crack initiation in mild steel under large scale yielding and variable stress states. In this study, a damage mechanics initiation criterion, called the Stress Weighted Damage Model, is extended t...
Article
A new criterion is proposed to simulate the initiation of ductile fracture due to Ultra-Low Cycle Fatigue (ULCF). Building on previous research, the new fracture criterion broadens the scope of ULCF models to account for a broader range of multi-axial stress and strain states that may be encountered in steel structures. The model formulation, suppo...
Conference Paper
Full-text available
A key aspect of post-earthquake recovery is determining whether damaged buildings are safe to reoccupy, prior to and during repairs. Developed as part of a broader study to evaluate damage to welded steel moment frames that occurred in the 1994 Northridge earthquake, FEMA 352 Recommended Post-Earthquake Evaluation and Repair Criteria for Welded Ste...
Article
Full-text available
Current building code requirements for seismic design are primarily intended to minimize life-safety risks due to structural damage under extreme earthquakes. While tall buildings designed under current standards are expected to achieve the life-safety goal, this study estimates that they may require up to 7.5 months of repair to return to function...
Article
Full-text available
To mitigate structural damage and associated losses due to strong earthquakes, rocking and pivoting steel spine systems have been proposed to control story drifts and localize inelastic deformations in ductile energy dissipating components. One of the challenges of designing these systems is proportioning the spine members to remain essentially ela...
Technical Report
Full-text available
This report is a product of the NHERI SimCenter under the auspices of the U.S. National Science Foundation (NSF). It provides an overview and review of simulation requirements and software tools for natural hazards engineering (NHE) of the built environment. The simulations discussed in this report are an essential component of research to address...
Article
Full-text available
With the goal to facilitate evaluation and mitigation of the risks from natural hazards, the Natural Hazards Engineering Research Infrastructure's Computational Modeling, and Simulation Center (NHERI SimCenter) is developing computational workflows for regional hazard simulations. These simulations enable research to combine detailed assessments of...
Article
Full-text available
The scarcity of strong ground motion records presents a challenge for making reliable performance assessments of tall buildings whose seismic design is controlled by large‐magnitude and close‐distance earthquakes. This challenge can be addressed using broadband ground‐motion simulation methods to generate records with site‐specific characteristics...
Conference Paper
Full-text available
Hospital systems are an important core of earthquake emergency response because these systems must provide timely treatment to people affected by the disaster. Earthquakes, however, can affect the hospitals' ability to function due to widespread damage to the hospital buildings and their supporting infrastructure. Additionally, earthquakes increase...
Conference Paper
Full-text available
Over the past few decades, there have been tremendous advancements in high-resolution performance-based earthquake engineering of individual facilities and in seismic risk assessment of geographically distributed systems. To a large extent, research and development have proceeded independently on performance-based methods to perform detailed evalua...
Conference Paper
Full-text available
Existing residential wood frame structures account for a significant portion of the seismic vulnerability of a geographic region, as earthquake-induced damages can lead to loss of housing and broad disruption to communities. In probabilistic seismic performance assessment, the standard method of using nonlinear response history analysis to estimate...
Conference Paper
Conventional earthquake-resistant structural systems are susceptible to structural damage during severe earthquakes, which can lead to high repair costs as well as indirect economic losses. Stacked rocking systems offer an attractive solution by concentrating nonlinear response in reliable energy-dissipation components while limiting the force and...
Article
Full-text available
Hospital systems play a critical role in treating injuries during disaster emergency responses. Simultaneously, natural disasters hinder their ability to operate at full capacity. Thus, cities must develop strategies that enable hospitals’ effective disaster operations. Here, we present a methodology to evaluate emergency response based on a model...
Article
In contrast to approaches based on scaling of recorded seismograms, using extensive inventories of numerically simulated earthquakes avoids the need for any selection and scaling of motions which implicitly requires assumptions on intensity measures (IMs) that correlate with structural response. This study has the objectives to examine seismogram f...
Article
Full-text available
This article presents a probabilistic formulation for modeling earthquake rupture processes of mainshocks. A correlated multivariate Bernoulli distribution is used to model rupture occurrence. The model captures time interaction through the use of Brownian passage-time distributions to assess rupture interarrival in multiple sections of the fault,...
Article
Full-text available
Structural topology optimization has been successfully investigated to improve the designs of a variety of civil, mechanical and aerospace applications. While topology optimization for static loading is fairly well developed, methods for dynamic seismic loading remain a challenge. In this paper, dynamic topology optimization methods are reviewed an...
Preprint
Over the past few decades, there have been tremendous advancements in high-resolution performance-based earthquake engineering of individual facilities and in seismic risk assessment of geographically distributed systems. To a large extent, research and development have proceeded independently on performance-based methods to perform detailed evalua...
Conference Paper
Full-text available
The downtown business districts of San Francisco, Los Angeles and other cities in the western United States have significant inventories of older (pre-2000) tall steel buildings that have elevated risk, compared to new code-conforming buildings, of damage and collapse from strong earthquakes. Many of these buildings have welded connections of the t...
Article
This paper evaluates a pulse intensity measure, the Effective Incremental Ground Velocity ( EIGV), for predicting sliding displacements induced by real ground motions. EIGV is based on computing the additional incremental velocity of a pulse after a system begins to slide. Predictions of peak sliding displacements are made using multiple ground mot...
Article
This paper examines the effects of earthquake ground motions in deep sedimentary basins on structural collapse risk using physics-based earthquake simulations of the Los Angeles basin developed through the Southern California Earthquake Center's CyberShake project. Distinctive waveform characteristics of deep basin seismograms are used to classify...
Preprint
Full-text available
Hospital systems play a critical role in treating injuries and preventing additional deaths during disaster emergency response. Natural disasters hinder the ability of hospital systems to operate at full capacity. Therefore, it is important for cities to develop policies and standards that enable hospitals' continuous operations to provide patients...
Article
Limited data on strong earthquakes and their effect on structures pose challenges of making reliable risk assessments of tall buildings. For instance, although the collapse safety of tall buildings is likely controlled by large‐magnitude earthquakes with long durations and high low‐frequency content, there are few available recorded ground motions...
Article
Nonlinear static and dynamic analyses are utilized by engineers for performance-based seismic risk evaluation of new and existing structures. In this context, nonlinear component modeling criteria are typically based on ASCE 41 guidelines. Experiments on wide-flange steel columns suggest that the ASCE 41-13 nonlinear component models do not adequat...
Article
This study benchmarks the performance of older existing tall steel moment resisting frame buildings designed following historic code-prescriptive requirements (1973 Uniform Building Code) against modern design standards (2015 International Building Code). The comparison is based on seismic risk assessments of alternative designs of a 50-story arche...
Article
Observed earthquake damage, laboratory tests, and loss analyses have shown gypsum partition walls to be susceptible to earthquake damage under small story drift ratios, which can result in large losses under design earthquake ground motions. To mitigate this risk, a new friction/sliding connection is proposed that can minimize or prevent damage to...
Preprint
Full-text available
This paper presents a probabilistic formulation for modeling earthquake rupture processes of mainshocks. A correlated multivariate Bernoulli distribution is used to model rupture occurrence. The model captures time interaction through the use of Brownian passage-time (BPT) distributions to assess rupture interarrival in multiple sections of the fau...
Preprint
Full-text available
This paper presents a robust parameter estimation technique for a probabilistic earthquake hazard model that captures time and space interactions between earthquake mainshocks. The approach addresses the existing limitations of parameter estimation techniques by developing a Bayesian formulation and leveraging physics-based simulated synthetic cata...
Article
This paper presents a robust parameter estimation technique for a probabilistic earthquake hazard model that captures time and space interactions between earthquake mainshocks. The approach addresses the existing limitations of parameter estimation techniques by developing a Bayesian formulation and leveraging physics-based simulated synthetic cata...
Technical Report
Full-text available
This report is a product of the NSF NHERI SimCenter and provides an overview and review of simulation requirements and software tools for natural hazards engineering of the built environment. The simulations discussed in this report are an essential component of research to address the three grand challenge areas and associated research questions o...
Technical Report
Full-text available
http://onesanfrancisco.org/sites/default/files/inline-files/ATC-119-1_SF_TallBuildingsStudy_FINAL.pdf
Article
Full-text available
Rocking braced frames (RBF) are innovative structural systems that maintain near- zero residual drift through controlled rocking and a self-centering post-tensioning system. The braced frame members are designed to remain elastic, while inelasticity is concentrated in energy-dissipating elements. Recently developed capacity design procedures are re...
Conference Paper
Full-text available
Earthquake rupture occurrence modeling is the basis of seismic risk and Performance-based Earthquake Engineering (PBEE). This paper summarizes a probabilistic formulation for modeling time and space interactions of earthquake rupture occurrence in a tectonic region. The formulation represents the elastic-rebound behavior in the tectonic plates and...
Conference Paper
Full-text available
This paper introduces an innovative probabilistic model for assessing earthquake rupture occurrence. This model is able to account for the complexity of time and space interactions of ruptures. The rupture occurrence is modeled as a Multivariate Bernoulli that is updated as a function of the time since the last rupture at different locations of the...
Article
Earthquake simulation technologies are advancing to the stage of enabling realistic simulations of past earthquakes as well as characterizations of more extreme events, thus holding promise of yielding novel insights and data for earthquake engineering. With the goal of developing confidence in the engineering applications of simulated ground motio...
Article
Full-text available
This paper presents the application of a rigorous probabilistic framework that estimates the number, severity, and distribution of casualties over a region. A brief summary of the model is included in this paper. The application is for casualties resulting from a Mw 8.8 earthquake scenario occurring on the subduction fault along the coastline of Li...
Conference Paper
Full-text available
Earthquakes put heavy strains on hospital systems during the disaster emergency response phase. Damage to hospitals and supporting infrastructure disrupts critical hospital functions and damage to the built environment in the hospital's catchment community causes injuries that require medical treatment. As a result, a compromised hospital system ca...
Article
Full-text available
This paper introduces a probabilistic formulation for the estimation of the spatial distribution of multiseverity casualties due to earthquakes. The formulation assesses the number, severity, and distribution of injuries in the affected region. The model is an essential component of resilience formulations of health care systems in a community beca...
Conference Paper
Full-text available
Rocking spine systems with energy-dissipating devices are innovative earthquake resistant structural systems that can maintain near zero-residual drift though self-centering action. In such systems, the rocking spines consist of steel braced frames or other structural systems (e.g., concrete walls) that are designed to remain elastic, while all the...
Article
Consideration of uncertainties, including stochastic dependence among uncertain parameters, is known to be important for estimating seismic risk of structures. In this study, we characterize the dependence of modeling parameters that define a structure’s nonlinear response at a component level, and the interactions of multiple components associated...
Article
A methodology is introduced to assess the post-earthquake structural safety of damaged buildings using a quantitative relationship between observable structural component damage and the change in collapse vulnerability. The proposed framework integrates component-level damage simulation, virtual inspection, and structural collapse performance asses...
Article
The relationship between the earthquake performance of an inventory of buildings and the seismic resilience of a residential community is examined, by quantifying the immediate post-earthquake reduction and recovery of the shelter-in-place housing capacity. The effect of several mitigation strategies that involve replacing portions of the existing...
Article
This paper presents a practical and validated method to automate the calibration of cyclic constitutive model parameters for structural steel. Due to the difficulty in developing homogenous stress-strain fields under large (>10-15%) cyclic strains in experimental specimens, constitutive model parameters are usually calibrated by a trial-and-error a...
Conference Paper
Full-text available
Hospitals play a paramount role during an earthquake emergency response. Large earthquakes have caused a large number of casualties in many communities in the past to the extent that the hospitals were overcrowded. Therefore, an important information for policy makers and leaders of the emergency response is the estimation of numbers of casualties...
Article
This paper describes the calibration of a phenomenological hinge model to simulate the nonlinear hysteretic response of reinforced concrete (RC) beam-columns under large deformations. The model is developed to enable simulation of the nonlinear dynamic response of RC frame buildings, from the initiation of damage to the onset of sidesway collapse,...
Conference Paper
Nonlinear dynamic (response history) analysis is being used increasingly in design practice for the performance-based seismic design of new buildings. In contrast to nonlinear static analysis, dynamic analysis requires more explicit modeling of cyclic response including strength and stiffness degradation as well as special consideration to selectio...
Conference Paper
Full-text available
The REDi Rating System (v1.0) was published in late 2013 as a guideline for implementing “resilience-based earthquake design” to achieve “beyond code” resilience objectives in the design of new construction. Since its publication, the REDi guidelines have been incorporated into several RFP’s and have been adopted for the design of high-profile proj...
Article
A local criterion is presented for ductile fracture of metals under a wide range of stress triaxiality. In contrast to previous criteria, whose accuracy is generally limited to the narrower stress ranges over which they were originally validated, the proposed criterion is rigorously supported through (1) hypothesis testing against 352 experiments c...
Article
Full-text available
Shaking table tests were conducted on a new low cost sliding seismic isolation system aimed at significantly improving the seismic performance of low-rise lightweight residential construction. A two-story, full-scale seismically isolated wood frame house was tested dynamically under multiple ground motions on a shake table. Two different sliding is...
Article
Robust estimation of collapse risk should consider the uncertainty in modeling of structures as well as variability in earthquake ground motions. In this paper, we illustrate incorporation of the uncertainty in structural model parameters in nonlinear dynamic analyses to probabilistically assess story drifts and collapse risk of buildings. Monte Ca...