AUTC’s Zhaohui Yang and his research team have posted six videos of their exciting seismic shake-table experiments at China’s Harbin Institute of Technology.
Posted on Youtube, these are available through the following links:
1st video: Over view of the completed model, sensors, data acquisition system, etc. No motion inputted: http://www.youtube.com/watch?v=gHHlT16EgL8
2nd video: sine wave inputted; PGA=0.03g; Duration=20 sec. Purpose is to check the model and data acquisition system: http://www.youtube.com/watch?v=ep11H65r97s
3rd video: Scaled 2002 Denali earthquake inputted; PGA=0.15g; Duration=20 sec; Purpose is to study pile behavior in linear range: http://www.youtube.com/watch?v=LRl2CWbNjIw
4th video: First part of 2011 Japan earthquake; Duration=40 sec; PGA=0.53g; Purpose of Japan part 1 and part 2 is to study pile behavior in nonlinear range: http://www.youtube.com/watch?v=-X2UkzGFt0s
5th video: Second part of 2011 Japan earthquake; Duration=40 sec; PGA=0.53g: http://www.youtube.com/watch?v=QJ6–5Y7WZs
6th video: Scaled first part of 2011 Japan earthquake: Duration=40 sec; PGA=0.795g; Purpose is to generate larger lateral displacement: http://www.youtube.com/watch?v=-2MiOCgKKDk
About the Project
Liquefaction and associated ground failures have been common in major earthquakes across Alaska, causing extensive infrastructure damage. Lateral spreading is particularly damaging if a non-liquefiable crust rides on top of liquefied soil during an earthquake. The physical properties of frozen ground crust change drastically in winter; stiffness and strength increase, and permeability decreases. The impact on a bridge foundation by frozen ground crust resting on a liquefied soil layer and the loads generated during a winter earthquake are unknown. This project, an outgrowth of another AUTC project, is a collaboration with Professor Runlin Yang, an engineer at the University of Science and Technology Beijing, China. Yang is interested in liquefaction-induced geotechnical engineering problems in cold regions and is willing to share the cost of two large-scale shake table tests, which makes it feasible to integrate physical testing with our ongoing simulation project. This project aims to conduct physical experiments to gain insight into liquefaction-induced ground failures and consequences on highway bridge substructures, as well as to validate the results of computer modeling. The knowledge gained from this project will lead to improvements in seismic design of highway bridge foundations in Alaska, as well as in other northern regions with seismic activity.
To learn more, visit the project web-page here.