Implosion Offers Teaching Moments for Engineers
Nebraska’s razing of Cather and Pound halls is helping engineers further define how large, multi-story buildings react to earthquakes, wind and blast loads. Learn more: https://news.unl.edu/newsrooms/today/article/cather-pound-razing-offers-teaching-learning-moments-for-engineers/
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[00:00:13.935]Our team is trying to understand
[00:00:15.435]the dynamic behavior of the structures.
[00:00:18.184]It's important to get a better understanding
[00:00:19.943]of how these structures behave,
[00:00:22.437]and, ultimately, how they behave during an extreme event
[00:00:26.542]a tornado, an earthquake, or a man-made hazard
[00:00:29.723]due to a blast or collision.
[00:00:31.410]The ultimate goal is trying to make our buildings safer.
[00:00:34.310]Our research group is looking at the accuracy
[00:00:37.453]with which computer models predict the behavior
[00:00:40.003]of a large building structure
[00:00:42.277]when it's acted upon by extreme loads.
[00:00:45.820]By doing that, we can kind of back into
[00:00:48.586]what we need to do to improve the tools
[00:00:52.330]that we use to predict the response of other buildings
[00:00:55.657]so that potential future events can be prevented,
[00:01:00.349]and if not prevented, then mitigated somewhat.
[00:01:06.407]For the blast sequence,
[00:01:08.350]we've acquired 32 sensors that will be installed.
[00:01:11.729]We also acquired six miles of cables
[00:01:14.549]to make sure we're able to wire in the sensors
[00:01:17.487]to the adjacent building.
[00:01:19.499]Actually, when I first came here,
[00:01:21.849]I lived in this building for half a year.
[00:01:25.384]Yeah, I was a resident here.
[00:01:27.707]When we're measuring frequency,
[00:01:29.501]we're actually measuring the ratio
[00:01:30.923]between mass and stiffness of our structure.
[00:01:33.991]In mass, that's the weight of our structure.
[00:01:36.178]Stiffness is its resistance to movement.
[00:01:40.009]That actually tells us the current state of the structure
[00:01:42.993]and its state of health.
[00:01:47.434]Both the Lidar scanner, that's light detection and ranging,
[00:01:51.096]and the unmanned aerial system,
[00:01:52.429]they're used to actually capture
[00:01:54.320]the surface geometry of the structure.
[00:01:56.465]That's for both measurements of its current state
[00:01:59.360]as well as for quantifying defects.
[00:02:14.296]We blow things up in a virtual sense
[00:02:16.684]to examine what will happen.
[00:02:18.583]We are interested in predicting how the thing falls.
[00:02:21.279]Does it fall the way we thought it would fall?
[00:02:23.212]Does it fall the way they thought it would fall?
[00:02:25.351]As this thing collapses, where are the loads going?
[00:02:27.988]And where are they going
[00:02:29.524]as the stuff that holds the building up,
[00:02:31.459]as the columns, as the floors, as the beams come apart?
[00:02:35.733]So how those materials are responding
[00:02:38.261]to as severe an event as possible.
[00:02:42.144]My hope is that we can look at it in real time
[00:02:44.576]and be able to, in real time, this is my pipe dream,
[00:02:47.713]be able to have the model there predicting the behavior
[00:02:50.588]right next to a video that is showing the behavior.
[00:02:53.751]This research is critical to us at the university
[00:02:57.015]and at the college level because it enables us
[00:03:00.315]the ability to capture this one of a kind data set.
[00:03:03.070][Professor Linzell] There's just a number
[00:03:03.903]of unique aspects to this study
[00:03:07.371]that will make it valuable
[00:03:08.964]to the research community at large.
[00:03:12.049]Research projects like this
[00:03:13.382]allow for effective training
[00:03:15.748]of our graduate students and really the future work force.
[00:03:19.796]Getting an understanding
[00:03:20.867]of what the anticipated response is
[00:03:23.232]and then being able to observe what happens in real time
[00:03:25.884]and then look after the fact and see, okay,
[00:03:28.149]how accurate were these virtual predictions
[00:03:30.250]of a real world occurrence is something that
[00:03:33.334]I think they will treasure for the rest of their careers.
[00:03:37.661]This is definitely
[00:03:38.863]a once in a lifetime opportunity.
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