cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17603/ds2-q2w5-0t48
title: Probabilistic Assessment of Tsunami Forces on Coastal Structures

description: In the last decade, tsunamis have caused hundreds of thousands of deaths and hundreds of billions of dollars in damage to coastal communities around the world. While a major tsunami has not impacted the United States in some time, there is significant risk to the Pacific Coast and recent storm surge events have shown a potential for damage to domestic infrastructure similar to what was seen in East Asia and the Pacific. Interest in tsunami load predictions for structural design has grown, but it is difficult to develop models that accurately predict the tsunami load response of an individual structure, much less the tsunami risk for multiple structures within a specific region. The framework presented here is designed to improve the safety and sustainability of coastal structures and, consequently, improve tsunami hazard assessments, post-event response, and recovery efforts. Ultimately, this work will result in safer communities through increased public awareness of the risks posed by these types of hazards and enhanced tools to develop resilient infrastructure systems. Increased computing power has prompted the development of novel numerical approaches to tsunami-structure interaction modeling tailored to capture specific physical phenomena with high-levels of resolution and accuracy, including coupled multiphysics models to simulate complex system interactions. If community-specific assessments of structural vulnerabilities are to be achieved, they must be based on a fundamental understanding of these interactions and an ability to efficiently model the associated physical processes in a probabilistic framework that accounts for the uncertain nature of these events. The primary goals of this research project are to establish an open-source modeling framework where 3D computational fluid dynamics solvers can be used efficiently to inform the development of load-prediction capabilities for existing, widely used inundation models and to develop a probabilistic framework for predicting the fluid loading and structural response of coastal structures at a community level. The research team will validate this framework against existing experimental data, assess the effects of bathymetry and community layout on flow, refine the models to include force predictions, and extend probabilistic tsunami hazard assessment methods to include fluid loading criteria. This work will provide users both the framework and the software tools necessary to develop site-specific numerical models to increase the safety and sustainability of coastal structure by improving our understanding of the probabilistic risk posed by tsunami events on these structures.
DOI: 10.17603/ds2-k3y4-y384
title: Shake Table Test of A Two-story Mass Timber Building with Post-tensioned Rocking Walls

description: This testing program is a full scale sake table test of a two-story mass timber building at NHERI@UCSD facility. The building is a wood building built with glulam beams and columns with Cross Laminated Panel (CLT) floors. The lateral system is an innovative CLT rocking wall system with post-tensioning to enable self-centering of the building after major earthquakes. It is part of a six-university collaborative project "NHERI Tallwood Project", which runs from 2016 to 2020 and contains other testing programs that are to be conducted in the next 2 years. Future testing programs will be added to DesignSafe  as they become available and linked to this publication. The participating universities include Colorado School of Mines, Colorado State University, University of Washington, Washington State University, University of Nevada at Reno, and Lehigh University.
DOI: 10.17603/ds2cw97
title: NSF #1235496: Pre/Post Earthquake Damage Assessment for Infilled RC Frame Buildings

description: The aim of the proposed research is to develop a framework for the reliable assessment of damage in existing reinforced concrete frames infilled with masonry walls. The data obtained from field testing will be used to validate finite element models and damage identification techniques. The combination of the two tools will allow the derivation of a damage index that can be used to identify the state of a structure prior or after an extreme event. Emphasis will be given in modeling the three-dimensional behavior of the structure including the out-of-plane behavior of the infill walls. Moreover, simplified models will be developed and validated with the results of the detailed analytical models. The buildings that were the focal point of this experimental and analytical study were selected because they were damaged/deteriorated due to earthquakes or severe winters. The data obtained from the forced vibrations of the building will also be used for the validation of the analytical tools. In summary, the proposed research includes full-scale tests that will push a damaged structure further into the nonlinear behavior; finite element models to capture the in- and out-of-plane interactions between the infills and the bounding frame; validation of the model with data obtained from the tests, as well as validation with data from previous earthquakes; and development and validation of a system and damage identification techniques for the quantification of damage in a real structure.
DOI: 10.17603/ds2p41p
title: NEESR: Seismic Performance of Conventional and Innovative Special Structural Walls

description: The project explored design and performance limits for structural walls, considering both conventional wall construction practices and innovative construction practices. A principal finding of recent earthquakes (in 2010 and 2011) and laboratory tests from 200 to 2010 is that wall performance is limited by stability and ductility capacity of the flexural compression zone. Given this critical issue, a series of studies on conventional walls and boundary elements constructed with innovative materials (HPFRCC) to establish performance limits for flexural compression failures in reinforced concrete structural walls. Tests were designed to acquire knowledge, improve construction practices, and advance simulation tools. The primary research outcomes include: 

(1)	Completing  tests of eight ordinary boundary element (OBE) prisms at UCLA. The test specimens were detailed according to ACI 318-11 21.9.6.5 with the goal of assessing failure modes and strain capacities as influenced by concrete cover, configuration of transverse reinforcement, and spacing of transverse reinforcement. Based on the tests, a relationship used to assess buckling of longitudinal reinforcement was extended to wall boundaries with typical OBE detailing. 
(2)	Completing tests on 13 special boundary element (SBE) prisms at UC Berkeley. The tests investigated the role of boundary element detailing and wall thickness. The tests indicated that the strain capacity of relatively (&lt; 12 inches) walls with ACI 318 code compliant SBE detailing was less than one percent and that improved detailing or high-performance, fiber-reinforced concrete did not improve the strain capacity significantly. 
(3)	Conducted tests on seven, approximately one-half scale wall panels represented the base of roughly 8 to 10 story walls in a moderately tall building.  The primary test variables were the configuration and quantity of boundary transverse reinforcement, the depth of the neutral axis, and the wall thickness. The test provided essential data to develop a new, displacement-based model for predicting the drift capacity of structural walls with SBE. 
(4)	Developing code change proposals that were approved for ACI 318-14 and additional code change proposals that have been approved for inclusion in ACI 318-19. 
(5)	Creating and documenting a detailed dataset that was uploaded to DesignSafe-ci Data Depot that can be used for future reserarch.
DOI: 10.17603/ds2-vpce-c875
title: Buildings Surveyed after 2017 Mexico City Earthquakes

description: This project consists of building data collected in Mexico City after the 19 September 2017 Puebla-Morelos Earthquake. Over 120 reinforced concrete structures were surveyed by engineers from USA, Mexico, and New Zealand with support from The Colegio of Ingenieros of Mexico City (CICM), National Autonomous University of Mexico (UNAM), The National Science Foundation (NSF), and American Concrete Institute (ACI) Subcommittee 133. This effort involved researchers from Cal Poly-SLO, University of Massachusetts-Amherst, University of Nebraska, University of California-San Diego, University of Kansas, The University at Buffalo , Stanford, University of Alabama, University of Auckland, and Purdue University.
DOI: 10.17603/ds2j08p
title: Evaluation of Drainage for Liquefaction Remediation

description: This project looked at the response of liquefiable sand deposits with and without prefabricated drains installed.  The project involved centrifuge testing, as well as field testing in South Carolina.
DOI: 10.17603/ds2xm4n
title: Large eddy simulation of dam-break-driven swash on a rough-planar beach

description: Turbulence characteristics in the swash zone are investigated using a 3-D large eddy simulation model. The numerical simulation was carried out using OpenFOAM which solves the filtered Navier-Stokes equations for two immiscible fluids (air and water) with a standard Smagorinsky subgrid-scale closure. This work is published in Journal of Geophysical Research: Oceans (2017), doi:10.1002/2016JC012366. The case setup, simulation data are provided here to facilitate successive works.
DOI: 10.17603/ds25m42
title: NHERI UCSD Hybrid Simulation Commissioning

description: The use of large shake tables can provide extended capabilities to conduct large- and full-scale tests examining the seismic behavior of structural systems that cannot be readily obtained from reduced scale testing, or under pseudo-dynamic conditions. When considering large or complex structural systems, however, additional challenges arise such as high costs of full scale specimens or capacity limitations of currently available shake table. Some of these limitations can be overcome by real-time hybrid shake-table substructure test method that requires only key parts to  be evaluated experimentally on the shake table while the remainder of the structure is modeled numerically. As a demonstration of the applicability of this method using a large shake tables, a series of hybrid shake table tests were conducted on the UCSD Large High Performance Outdoor Shake Table (LHPOST) with capabilities to test full scale structural models. A physical specimen was built on the LHPOST, and coupled with a numerical model using hybrid simulation techniques. Comparison of different methods to interface the numerical model with the control systems were evaluated. The physical specimen consisted on a rigid mass resting on four triple friction pendulum bearings that represented the upper story of a shear building model having the effect of  a tune mass damper. Numerical models of shear buildings with different periods and multiple degree of freedom were considered to evaluate the performance of the table and stability and accuracy of the simulation results. The teste results demonstrate the effectiveness of tune mass dampers in reducing structural response and the benefit of using a hybrid shake table test method towards expanded system level dynamic testing. The performance of the shake table is evaluated and methods to compensate delay and other sources of error are discussed.
DOI: 10.17603/ds2839g
title: One-dimensional compression testing for low-plasticity silts

description: This experimental program supports a broader project on validating methods to mechanistically develop relationships between cone penetration test measurements and the engineering properties of intermediate soils.
DOI: 10.17603/ds2-eqg9-dx70
title: Influence of Dense Granular Columns on the Performance of Level and Gently Sloping Liquefiable Sites

description: This project presents the results of three centrifuge experiments that systematically evaluate the influence of dense granular columns and their various mitigation mechanisms and properties on the seismic performance of level and gently sloping sites underlain by a layered liquefiable deposit consisting mostly of clean sand.
DOI: 10.17603/ds2-115p-6z03
title: Hashash et al. (2018) Western United States Site Response Simulation Database

description: This project includes the NoSQL database of 45,201 one-dimensional seismic site response simulations (15,067 of each linear, equivalent-linear and nonlinear simulation) developed for the parametric study described in Hashash et al. (2018) to inform new simulation-based site amplification models for Western United States (WUS). There are following files and a folder in this project: (i) Readme (0_Read_me.pdf) file and a user’s guideline file (1_NoSQL DB for Hashash et al. (2018) West Simulations.pdf) to detail the structure of the database files and how to query the database though Jupyter Notebook. (ii) A Jupyter Notebook (2_NoSQL-DB-Query-Hashash-et-al-2018-West-Simulations.ipynb) to query the simulation database. This notebook needs to be copied into the "My Data" tab to perform queries. (iii) A report (3_HASHASH-ET-AL-2018-IN-WESTERN-US-FAS-AMP-MODELS-V2.pdf) detailing the parametric study of Hashash et al. (2018) simulations (iv) WEST-SIM-DB: This folder includes the static files of Hashash et al. (2018) simulations NoSQL database. This work was funded in part by Southern California Earthquake Center (SCEC) and the Ministry of National Education of Turkey.
DOI: 10.17603/ds2-wg2r-gg46
title: SHORT COLUMN AND SOFT STOREY BEHAVIOR AT 3D RC FRAMES ON THE SHAKING TABLE

description: . The maximum positive and negative accelerations, duration, the failure mode of specimens
DOI: 10.17603/ds25t13
title: Effect of prior strain history on cone penetration resistance and cyclic strength of saturated sand: 1-m radius centrifuge tests

description: A set of 1-m radius centrifuge tests on clean, saturated, Ottawa sand models subjected to multiple shaking events.  These tests supplement a set of 9-m radius centrifuge tests.
DOI: 10.17603/ds2-4b2n-at54
title: Buildings Surveyed after 2017 Mexico City Earthquakes

description: This project consists of building data collected in Mexico City after the 19 September 2017 Puebla-Morelos Earthquake. Over 120 reinforced concrete structures were surveyed by engineers from USA, Mexico, and New Zealand with support from The Colegio of Ingenieros of Mexico City (CICM), National Autonomous University of Mexico (UNAM), The National Science Foundation (NSF), and American Concrete Institute (ACI) Subcommittee 133. This effort involved researchers from Cal Poly-SLO, University of Massachusetts-Amherst, University of Nebraska, University of California-San Diego, University of Kansas, The University at Buffalo , Stanford, University of Alabama, University of Auckland, and Purdue University.
DOI: 10.17603/ds2-jd35-bw27
title: Modelling of RC Walls and RC Wall Buildings

description: This project consists of two studies. The first is an OpenSees model calibration study, where a modelling approach is developed to model RC walls, particularly to capture deformation capacity. The second study is a building analysis study to determine the performance of an archetype RC wall building located in Wellington, New Zealand. This study utilizes the modelling recommendations from the calibration study and analyses the building over several hazard levels (multiple-stripe analysis) to investigate the probability of various damage states Further information on both studies can be found at: Shegay, A. V., “Seismic Performance of Reinforced Concrete Walls Designed For Ductility,” Ph.D. Thesis. University of Auckland, 2019
DOI: 10.17603/ds2-p8wj-ey61
title: Cyber-Physical Systems Approach for the Optimal Design in Wind Engineering: Parapet Walls

description: The research objective of this project is to develop a cyber-physical systems (CPS) approach to the optimal design of structures for wind hazards. The approach combines the accuracy of physical wind tunnel testing with the efficiency of numerical optimization algorithms to create an efficient approach to structural design. Experiments are executed in a wind tunnel, sensor feedback is monitored by a computer, and optimization algorithms dictate physical changes to the model in the wind tunnel. The traditional design process involving wind tunnel testing is an iterative procedure that can take weeks or months. Rather than having to construct multiple entirely new models, a model with physically adjustable parameters can be used to streamline the design process to efficiently reach the optimal solution much quicker than purely experimental methods and with a higher degree of realism than purely numerical methods.
DOI: 10.17603/2z8h-7k90
title: Hurricane Matthew (2016) Storm Surge and Wave Simulations With Data Assimilation
DOI: 10.17603/ds2hx3h
title: LEAP-2018 - Stress-strain response of Ottawa F65 sand in Cyclic Simple Shear

description: This project publishes the results of cyclic direct simple shear tests performed at  George Washington University (GWU) to characterize the stress-strain-strength response of Ottawa F-65 sand. This data along with the results of the cyclic torsional shear tests conducted at Kyoto University for LEAP-Asia-2018, and the results of the monotonic and cyclic triaxial tests conducted at GWU for LEAP-2015 and LEAP-2017 are provided to the numerical simulation teams who participate in the LEAP-Asia-2018 and LEAP-RPI-2019 prediction exercises. The numerical simulation teams use these results to calibrate the constitutive models.
DOI: 10.17603/ds2-r8m0-qa07
title: RAPID/Collaborative Research: The Effects of the 2017 Central Mexico Earthquake on Reinforced Concrete Buildings

description: This project contains the ambient vibration data of eleven buildings located in Mexico City obtained during a reconnaissance trip 5 months after the 2017 earthquake. The reconnaissance team included researchers from the University at Buffalo, University of Nebraska-Lincoln, UC San Diego, Cal Poly, San Luis Obispo, and was led by Purdue University. The instrumented structures include four schools, one high-rise building, as well as residential buildings. For four of the residential buildings, lidar scans were also obtained by the reconnaissance team. 

The structural system in all cases involved a combination of RC walls and columns, and masonry infill panels. The buildings had varying levels of damage due to the 2017 earthquake. The recorded acceleration data can be used to obtain the modal frequencies and mode shapes of the damaged building, while the lidar data can be used to quantify residual deformations and damage features.
DOI: 10.17603/ds24t25
title: Effect of strain history on cone penetration resistance and cyclic strength of saturated sand

description: This series of tests demonstrate the use of dynamic centrifuge model testing to develop CPT based correlations for the cyclic strength of soil. Level profiles of saturated Ottawa sand were subjected to multiple shaking events until the models were no longer liquefiable.  In-flight cone penetration tests track the progressive change in relative density over multiple shaking events. Dense arrays of accelerometers and pore pressure transducers provide the basis for computing cyclic stress ratios, shear strains, and volumetric strains through inverse analyses. These tests with clean sand facilitate comparison of the results with liquefaction triggering correlations developed by other means.
DOI: 10.17603/ds2-2etk-mr72
title: Bayesian Identification of a Prototype Nonlinear Energy Sink Device

description: Nonlinear energy sinks devices are structural attachments which have the potential to enhance passive structural control in earthquake-susceptible structures, similar to tuned mass dampers. These devices are designed to leverage geometric nonlinearities in their construction to extract vibrational energy from the primary structure over a wide range of frequencies. Prior to implementing these devices in real-world structures, additional characterization of their behavior and establishment of identification and monitoring techniques is necessary. In this project, the results of which are given in the linked publications, we develop a robust method for identifying a prototype nonlinear energy sink device which leverages Sobol’ sensitivity analysis to inform the implementation of an unscented Kalman filter identification approach.
DOI: 10.17603/ds2sq5t
title: Storm Surge Modeling of Typhoon Haiyan

description: Typhoon Haiyan (2013) was a catastrophic natural disaster experienced in the history. The Advanced Circulation (ADCIRC) numerical model was used to hindcast and evaluate Typhoon Haiyan by comparing modeled results from actual results. Interpreting Typhoon Haiyan as the most significantly damaging scenario, we create three synthetic typhoons to identify storm surge prone areas in the Philippines. Results from the simulations showed the relationship between Typhoon Haiyan’s strong counterclockwise winds and an almost linear movement to the east. In addition a gradually sloping shelf and shallow bathymetry in most areas of the Philippines makes up all the right conditions in the generation of storm surge. This research is intended to assess the performance of ADCIRC to be used in predicting storm surge from typhoons in the future, assist in land development by identifying storm surge prone areas, and aid in disaster mitigation and preparedness planning. This project contains the simulation dataset corresponding to research conducted by undergraduate students at the University of Texas at Austin during the summer of 2018 under professor Clint N. Dawson. The report enclosed contain papers and guides that explain the methods and results of this research.
DOI: 10.17603/ds20x2x
title: Elevated Structure Investigation of Wave Pressures and Forces

description: A large-scale physical hydraulic model was constructed in the Large Wave Flume (LWF) at the NHERI-EF at Oregon State University. We measured water surface elevations, horizontal and vertical pressures, and horizontal and vertical forces on an idealized structure. The structure was designed so that it could be incrementally elevated above the bed, and wave conditions were generated when the structure's base was elevated from at grade to 0.28 cm above the still water level (0.40 m).