Ádám Zsarnóczay

Ádám Zsarnóczay
Stanford University | SU · Department of Civil and Environmental Engineering

PhD

About

36
Publications
20,076
Reads
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185
Citations
Citations since 2017
24 Research Items
163 Citations
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20172018201920202021202220230102030405060
20172018201920202021202220230102030405060
Introduction
Ádám Zsarnóczay currently works as a Research Engineer at the Department of Civil and Environmental Engineering, Stanford University. His research concerns natural hazards engineering in general, focusing on probabilistic hazard assessment; calibration and development of numerical models to estimate structural response, damage, and losses; and large-scale simulations to describe the impact of natural disasters on an urban environment.
Additional affiliations
July 2018 - present
Stanford University
Position
  • PostDoc Position
Description
  • I am the lead developer of an open-source framework for multi-hazard damage and loss assessment for buildings and infrastructure. I also work on improving model calibration methods to quantify uncertainty in simulated structural response.
September 2017 - June 2018
Stanford University
Position
  • Visiting Scholar
September 2015 - June 2018
Budapest University of Technology and Economics
Position
  • Research Associate
Education
September 2010 - June 2014
October 2007 - September 2009
The University of Tokyo
Field of study
  • Civil Engineering
September 2003 - January 2010

Publications

Publications (36)
Article
Full-text available
With the aim of fostering the development of robust tools to simulate the impact of natural hazards on structures, lifelines, and communities, the Natural Hazards Engineering Research Infrastructure Computational Modeling and Simulation Center gathered sixty researchers, developers, and practitioners working in Natural Hazards Engineering (NHE) for...
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...
Preprint
Recent disasters have shown that income plays a central role in determining the capacity of impacted households to cope with the shock and recover from it. Researchers often rely on random sampling to generate synthetic household income from aggregated Census data. This conventional approach imposes limitations towards proposing realistic policies....
Preprint
Post-disaster housing recovery of rental units differs greatly from that of owner-occupied. There are fewer avenues for funding the repair of rental property. Moreover, if the landlord's home is damaged by the disaster they will likely prioritize the repairs of their home, further delaying the repair of rental units. Existing housing recovery model...
Conference Paper
Full-text available
Nonlinear response history analyses are the most reliable tool for quantifying the earthquake performance of structures and inform risk management decisions like acquiring insurance or planning a structural retrofit. Constructing these models requires assumptions about the structure and its earthquake hazard that are normally made based on a limite...
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
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
Safety and security of critical infrastructure networks is one of today’s top priorities, as they are getting increasingly complex and interdependent. Thus, their potential failure due to unforeseen and extreme events may result in excessive direct and indirect losses. Recently, focus has shifted from protection to resilience, i.e. the ability of a...
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
The intensity of many natural hazards, such as hurricanes, floods, tornadoes, etc., are increasing as a consequence of climate change. This increase in intensity coupled with the increase in population density, particularly along the coasts, is only magnifying the impact of such events. In order to quantify and mitigate the risk due to the hazards...
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...
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...
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...
Article
Full-text available
This research is part of a larger effort to better understand and quantify the epistemic model uncertainty in dynamic response‐history simulations. This paper focuses on how calibration methods influence model uncertainty. Structural models in earthquake engineering are typically built up from independently calibrated component models. During compo...
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...
Article
Full-text available
Buckling Restrained Braces (BRB) are innovative displacement dependent devices having balanced hysteretic behavior. Frames equipped with such devices are known as Buckling Restrained Braced Frames (BRBF). Application of BRB elements in Europe is seriously limited by the lack of a standardized European design procedure for BRBF. In the first part of...
Article
Full-text available
Buckling Restrained Braces (BRB) are innovative displacement dependent devices having balanced hysteretic behavior. Frames equipped with such devices are known as Buckling Restrained Braced Frames (BRBF). Application of BRB elements in Europe is seriously limited by the lack of a standardized European design procedure for BRBF. In the first part of...
Article
Full-text available
The application of buckling restrained braced frames is hindered in Europe by the absence of a standardized design procedure in Eurocode 8, the European seismic design standard. The presented research aims to develop a robust design procedure for buckling restrained braced frames. A design procedure is proposed by the authors. Its performance has b...
Conference Paper
Full-text available
Imperfect model calibration is a source of uncertainty rarely quantified in contemporary seismic performance assessment. Calibration using Bayesian inference yields models with random variables as parameters that allow direct consideration of model uncertainty. The paper presents a simple methodology based on the Markov Chain Monte Carlo approach t...
Conference Paper
Full-text available
Buckling Restrained Braced Frames (BRBF) are concentrically braced steel frames with Buckling Restrained Braces (BRB) in their diagonals. BRBs are special displacement dependent anti-seismic devices. Buckling of the internal steel core of a BRB is prevented by the continuous lateral support of its casing. This configuration ensures balanced hystere...
Chapter
Full-text available
Szerkezetek megbízhatósági analízise során az élettartamra vonatkoztatott tönkremeneteli valószínűséget gyakran a sérülékenységi-veszélyeztetettségi görbe módszerével határozzuk meg. A cikkben példákon keresztül illusztráljuk a módszer alkalmazását, a sérülékenységi és veszélyeztetettségi görbék előállításának módját extrém hatásoknak (tűz, földren...
Presentation
Full-text available
Tartószerkezetek földrengésre adott válaszának numerikus vizsgálata esetében kiemelt fontosságú a nemlineáris ciklikus képlékeny viselkedést kezelő numerikus anyagmodell pontossága és hatékonysága. Az utóbbi szempontot szem előtt tartva váltak népszerűvé a kizárólag egytengelyű feszültségállapotot kezelő fenomenológiai anyagmodellek. Megfelelő anya...
Article
Full-text available
The majority of continuous girder bridges in regions of moderate seismicity were designed before the introduction of modern seismic codes that prescribe seismic design verification for such structures. The objective of this study is to investigate the seismic performance of typical Hungarian continuous girder bridges through a parametric study. A d...
Thesis
Full-text available
The presented research aims to evaluate a Eurocode conform design procedure for BRBF with a robust and reliable methodology. The methodology is based on FEMA P695. It uses results of a large number of response history analyses on detailed structural models to evaluate the collapse probability of typical representations of the system under considera...
Article
Full-text available
The EN 15129 standard specifies the requirements for anti-seismic devices in Europe. The nonlinear displacement dependent device (NLD) group collects solutions that typically use the nonlinear properties of their material to dissipate energy and mitigate seismic damage. EN 15129 controls the cyclic hardening behavior of NLDs with a set of stringent...
Article
Full-text available
Introduction of the Eurocode 8 seismic design standard made earthquake resistant structural design obligatory in Hungary. Recent geophysical research concurrently led to significant increase in design peak ground acceleration values. Design of certain bridge structural members (e.g. bearings and surrounding structural details) is often governed by...
Conference Paper
Full-text available
This paper proposes a modification to the typical assessment methods based on Incremental Dynamic Analysis (IDA). Conventional IDA-based performance evaluation of structures uses a pre-defined set of ground motions and scales them to gradually increasing levels to represent different magnitudes of seismic intensity. The proposed methodology conside...
Article
Full-text available
The Buckling Restrained Brace (BRB) is an anti-seismic device with substantial energy dissipation capability that stems from the advantageous nonlinear behavior of its steel material. The central steel core of the brace is surrounded by a concrete casing. The casing provides continuous lateral support to the slender core and prevents it from buckli...
Conference Paper
Buckling Restrained Braced Frames (BRBF) are already popular solutions as primary lateral load resisting system in earthquake prone regions of North America and Japan. Although their superior seismic performance has been verified in these areas, regulations regarding their design and verification are not included in current European Standards. Thi...
Article
Full-text available
Because of its superior seismic performance, Buckling Restrained Braced Frame (BRBF) is already popular solution as primary lateral force resisting system in the United States. This paper first introduces the development and concept of BRBF and characterizes the structural performance with special respect to hysteretic behavior. System benefits tha...
Thesis
Full-text available
The objective of my Master Thesis was to analyze the seismic performance of typical Hungarian bridges and investigate the governing factors of the response of these structures. The common bridge types were assembled using data provided by several leading firms of Hungarian bridge design. Based on these data the parameters of the bridges to be model...
Thesis
Full-text available
The uncertainty in the evaluation of recovery strategies is inevitable. Due to the improved performance of computers, numerical analyses became a common tool of such disaster management which made the uncertainty in their inputs and results an important issue. This research includes the development of a simulation environment to investigate the com...

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Projects

Projects (6)
Project
The Natural Hazards Engineering Research Infrastructure (NHERI) program, funded by the National Science Foundation, catalyzes advances in natural hazards engineering research. The SimCenter contributes to this vision by transforming the application of numerical modeling and simulation within the field. The SimCenter lays the groundwork for a data-enabled cyberinfrastructure that will move from an environment of disjointed and often single-science, deterministic simulations to a collaborative one that bridges diverse scientific communities and integrates high-performance computing, data, software, and experimental facilities. The project aims to enable researchers to tackle problems of unprecedented scale and complexity, and to prepare a new cohort of natural hazard engineers to address and lead efforts to make society more resilient to natural hazards.
Project
We are interested in quantifying uncertainty in the parameters of numerical models of inelastic structural components (such as braces, connections, etc.), and the influence of such uncertainty on the simulated dynamic response of structural systems made of those components. This model-parameter uncertainty problem is distinct from those due to design variability or errors in manufacturing and construction. We pay particular attention to the influence of simplifications in the numerical model and lack of information due to having only a limited number of test results available.
Archived project
This research aims to propose and evaluate a BRBF design procedure in the framework of the European Eurocode standards and the recommendations of FEMA P-695. We use experimental analysis of BRB elements to develop and calibrate a BRB component model and create numerical frame models of BRBF for dynamic response history analyses. Our proposal is based on the standardized BRBF design procedure in the United States. Modifications are the result of iterative evaluation of the seismic performance of a set of representative BRBF archetypes.