Using Real World Data to Study Soil Foundation Structure Interaction
This is a partially developed activity description. It is included in the collection because it contains ideas useful for teaching even though it is incomplete.
Two resources are described here. These activities are not described in the context of a particular course. The resources are:
- A set of 3 animated videos showing exaggerated motion of two instrumented structures (braced and unbraced frame) subjected to a dynamic shaker, an M3.1 earthquake and an M 3.6 earthquake. The videos were developed from real data collected on the structures.
- An interactive web resource to remotely operate a dynamic shaker on an instrumented structure and collect data for analysis of the motions of the roof and foundation.
Students who view the video will:
- see how ground motion near the natural period of a structure causes resonance that amplifies motion of a structure.
- see how different types of seismic waves affect the motion of a structure.
Students who use the remote shaker module will:
- Understand fundmental structural dyanimcs concepts such as modes of vibration, and modal frequencies
- Create an analytical model based on the properties of a real structure
- Analyze data collected from a real structure
- Compare analysis of real data to analytical models
Context for Use
The interactive web resource is aimed at students who know something about waves, structural dynamics, and resonance. A module is under development (but not complete) that takes about two weeks to provide the background for students, collect the data, and analyze the data. Operating the remote shaker could be done as a homework assignment or as part of a lab. Once students have the password they can operate the shaker at any time of day.
Description and Teaching Materials
The web-based module is still in development, but should be available by May 2013. once completed it will be available at the NEES@UCSB and nees.org web sites. Students who use the module will
- Login to a (nonpublic) web page with username and password
- Select shaker input function
- Select output channels
- Run the shaker
- Save data to a webpage that also requires a password
- Analyze the data
- Background Information SFSI Videos (Acrobat (PDF) 2MB Mar4 13)
- Remote operation of SDOF Shaker to Study SFSI (Acrobat (PDF) 2.7MB Mar4 13)