Bridger, one of Prof. Abbie Liel’s Master’s students, successfully defended his Master’s thesis on April 17, 2019. Congratulations!
Dustin presented on his research comparing loss estimation using FEMA P-58 to other methods such as HAZUS at the 2019 Structures Congress in Orlando, FL.
Mohammad presented his talk entitled, “Experimental Investigation of Large-Scale Hybrid Sliding-Rocking Bridge Columns.” He also presented a talk for Jakub Valigura entitled, “Use of Large-Scale Experiments and Expert Solicitation to Define Damage States and Repair Strategies for Hybrid Sliding-Rocking Columns”.
In March 2019, Abbie was elected Fellow of ASCE. She was also recently selected as a fellow for the ASCE Structural Engineering Institute.
In the words of ASCE, “ASCE Fellows have made celebrated contributions and developed creative solutions that change lives around the world. It is a prestigious honor held by 3% of ASCE members.”
A new paper entitled, “Seismic Loss and Damage in Light-Frame Wood Buildings from Sequences of Induced Earthquakes” by Robert E. Chase, Abbie B. Liel, Nicolas Luco, and Bridger W. Baird was just accepted for publication in Earthquake Engineering and Structural Dynamics.
For a link to the manuscript pre-publication, click here.
Sand deposits are often stratified with thin layers of low-permeability silt. In this study, which will be published by the Journal of Geotechnical and Geoenvironmental Engineering, Dr. Balaji Paramasivam and his coauthors present the results of dynamic centrifuge tests that evaluate the response of 3- and 9-story inelastic steel structures (A and B) founded on layered liquefiable deposits with and without a silt cap. The thin silt layer is also evaluated in terms of its influence on the effectiveness of prefabricated vertical drains (PVDs) as mitigation. The results indicate that a thin silt cap may have beneficial or detrimental effects on a structure’s performance, particularly when evaluated in terms of foundation’s permanent rotation (or tilt). . These results point to the importance of identifying and characterizing thin interlayers in the soil profile, together with the key properties of structure, foundation, and ground motion, when assessing and mitigating the consequences of liquefaction.
A link to the manuscript pre-publication: here.
Zach Bullock, a Ph.D. student, co-advised by Professors Abbie Liel, Shideh Dashti and Keith Porter, has recently published an article about selection of appropriate intensity measures for liquefaction consequences such as foundation settlement and tilt. Among other findings, the paper argues that intensity measures at outcropping rock are actually more effective than those at the surface.
The manuscript is provided here ahead of publication.
Ph.D. student Casie Venable was awarded a 2019 USAID OFDA HFHI Shelter and Settlements Fellowships. She proposes to study friction between local understandings of safe shelter and expert assessments of safe shelter in the Philippines.
The Fellowship will provided funding for Casie to travel to Shelter and Settlements conferences to disseminate her findings and work with organizations in the sector to ensure these findings have a positive impact. Casie is collaboratively co-advised by Abbie Liel and Amy Javernick-Will.
Zach Bullock presents at 2019 GeoCongress. His talk was titled, “Generating Synthetic Borehole Data for Application in Site-Specific and Regional Evaluation of Liquefaction Consequences.” Go Zach!
Prof. Liel, along with PI Amy Javernick-Will (Construction Engineering & Management) and Co-PI Matt Koschmann (Communication), received a grant the National Science Foundation’s (NSF) Humans, Disasters, and the Built Environment (HDBE) program to study post-disaster shelter reconstruction programs in the Philippines and Puerto Rico. This 3-year, $500,000 project will assess the safety of post-disaster shelter in future earthquake and strong wind events, investigate household understanding of shelter safety, identify conflicts between engineering assessments and household understanding, and recommend communication strategies for improving post-disaster training programs. We expect this research to improve the resilience of communities affected by disasters. PhD students Casie Venable and Briar Goldwyn will be working on this project in the Philippines and Puerto Rico, respectively.
Congratulations Prof. Liel and the entire research team!
Link to the award: https://nsf.gov/awardsearch/showAward?AWD_ID=1901808&HistoricalAwards=false
Ph.D candidate Robert Chase defended his Ph.D disseration on Tuesday November 13th!
Hazard Implications of the 2016 Mw 5.0 Cushing, OK Earthquake from a Joint Analysis of Damage and InSAR Data by Magali Barba-Servilla, Bridger W. Baird, Abbie Liel and Kristy Tiampo
Find the access to the full text through remote sensing here: https://www.mdpi.com/journal/remotesensing/special_issues/Infrastructure_Monitoring
Although it is well-established that large-scale wastewater disposal in the Arbuckle formation is linked to the recent rise in seismicity in Oklahoma, few studies in Oklahoma have shown surface deformation resulting from induced seismicity or from wastewater injection or both. In our two-part study, we observe both the surface deformation leading up to the November 2016 Mw 5.0 earthquake and its coseismic signal using a satellite radar technique known as Differential Interferometric Synthetic Aperture Radar (DInSAR). In the first half, we perform a spatiotemporal correlation analysis of DInSAR derived surface deformation, wastewater injection, and seismicity in Cushing, OK. In the second half of the analysis, we invert for the source of the November 2016 event using DInSAR coseismic images, we classify photos of structural damage for the event, and compare their spatial signature.
Prof. Liel’s presentation focused on the risk to structures in Induced Earthquakes. Her research encompasses 3D dynamic structural modeling, seismic hazard and loss assessment, and more!
Ten faculty from the Department of Civil, Environmental and Architectural Engineering at CU Boulder have been awarded a GAANN award to fund eight new PhD students. The project aims to increase the number of graduate students and, eventually, researchers and teachers, who have the multidisciplinary skills to address (i) the country’s deteriorating infrastructure and (ii) the need for upgraded and new transport, water/sanitation, building, and power infrastructure. Applications are now open for students to join our exciting cohort: https://www.colorado.edu/gaann-infrastructure/. We are looking for students with interest in a variety of infrastructure systems and their interdependencies. Other requirements are listed on the linked site.
Zach's research is focused on developing a performance-based framework for analyzing building damage from liquefaction. This includes simplified procedures for estimating the settlement and tilt of shallow foundations. He is currently working on extending the framework to include analysis of densification as a mitigation technique, as well as to connect it to existing regional methods of analyzing liquefaction hazard.
Dustin presented a poster on his research, which aims to benchmark seismic risk predictions from the FEMA P-58 method with empirical earthquake data and other existing risk assessment methodologies such as Hazus. The project has developed a set of over 55,000 FEMA P-58 performance models using the Seismic Performance Prediction Program (SP3) to compare with predictions from Hazus, and found good correlation between P-58 and Hazus for loss predictions of wood light frame structures.
QuakeSmart is a FEMA National Earthquake Hazards Reduction Program (NEHRP) initiative to help businesses in at-risk earthquake communities implement earthquake mitigation actions.
Abbie's talk was entitled “Damage from a Moderate Magnitude Earthquake: What Could Happen in Colorado?” In her talk, she summarized the potential damage from moderate magnitude earthquakes, cost impacts from these events, and potential proactive mitigation techniques.
Recent Ph.D. Graduate Balaji Paramasivam’s paper on the influence of prefabricated vertical drains on soil, foundation and structure response in earthquakes is published in the October edition of the Journal of Geotechnical and Geoenvironmental Engineering. It has been selected as the Editor’s Choice.