Impact Mechanics, Damage and Building Pounding: The Effect of Co-efficient of Restitution, Structural Yielding and Gap Ratio (2012)
Type of ContentConference Contributions - Published
PublisherUniversity of Canterbury. Mechanical Engineering
Impact between structures of bridge sections can play a major, unexpected role in seismic structural damage. Linear and non-linear models are developed to analyze structural impact and response of two single-degree-of-freedom structures, representing adjacent buildings or bridge sections. The analyses presented assess probability of impact, displacement change due to impact, and the probability of increased displacement due to impact. These are assessed over a matrix of structural periods for each degree-of-freedom, different impact coefficients of restitution, and a probabilistically scaled suite of earthquake events. Linear versus non-linear effects are assessed using a Ramberg-Osgood non-linear model for column inelasticity. The normalized distance, or gap-ratio (GR), defined as a percentage of the summed spectral displacements, is used to create probabilistic design requirements. Increasing GR and structural periods that are similar (T2/T1~0.8-1.25) significantly decrease the likelihood of impact, and vice-versa. Including column inelasticity and decreasing coefficient of restitution decrease displacement increases due to impact and thus reduce potential damage. A minimum GR~0.5-0.9 ensures that any displacement increases will be less than 10% for 90% of ground motions over all structural period combinations (0.2-5.0sec). These results enable probabilistic design guidelines to manage undesirable effects of impact– an important factor during the recent Canterbury, New Zealand Earthquakes.
CitationBoyer, F., Labrosse, G., Chase, J.G., Rodgers, G.W., MacRae, G.A. (2012) Impact Mechanics, Damage and Building Pounding: The Effect of Co-efficient of Restitution, Structural Yielding and Gap Ratio. Christchurch, New Zealand: New Zealand Society for Earthquake Engineering: 2012 Annual Technical Conference (NZSEE), 13-15 Apr 2012. Proceedings, Paper 87.
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ANZSRC Fields of Research40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
40 - Engineering::4005 - Civil engineering::400510 - Structural engineering
09 - Engineering::0913 - Mechanical Engineering::091399 - Mechanical Engineering not elsewhere classified
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