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Researchers from IIT Describe Findings in Structural Engineering (Seismic vulnerability of skew bridges under bi-directional ground motions)

July 30, 2014



By a News Reporter-Staff News Editor at Journal of Engineering -- Researchers detail new data in Structural Engineering. According to news reporting out of Kanpur, India, by VerticalNews editors, research stated, "Past earthquakes have demonstrated that skew bridges are more vulnerable to earthquake induced failure than a normal bridge due to their complex load transfer mechanism. This study deals with the effect of skew angle on seismic vulnerability of these bridges under horizontal two-component (bi-directional) ground motions."

Our news journalists obtained a quote from the research from IIT, "For this purpose, representative models of two-span simply supported, typical highway overpasses with varying skew angles have been considered. Finite element models of these bridges, which have been designed using modern seismic provisions, are developed using a widely used software. A suite of bi-directional ground motions with varying strong motion properties and representing different hazard levels is used for nonlinear dynamic analysis and subsequent seismic vulnerability estimation using fragility curves. Deck unseating and damage of columns are considered as the damage measures for the vulnerability analysis. The effect of ground motion directionality on the vulnerability of bridges has also been investigated in this study. Results of this study indicate that as the skew angle increases, there is an increase in the probability of failure for a given ground motion intensity."

According to the news editors, the research concluded: "It is also found that the dispersion of fragility curves for bi-directional ground motions can be minimized by using the square root of sum of squares (SASS) of peak ground acceleration (PGA) of all components than the PGA of any component."

For more information on this research see: Seismic vulnerability of skew bridges under bi-directional ground motions. Engineering Structures, 2014;71():150-160. Engineering Structures can be contacted at: Elsevier Sci Ltd, The Boulevard, Langford Lane, Kidlington, Oxford OX5 1GB, Oxon, England. (Elsevier - www.elsevier.com; Engineering Structures - www.elsevier.com/wps/product/cws_home/30415)

Our news journalists report that additional information may be obtained by contacting S.P. Deepu, IIT Kanpur, Dept. of Civil Engn, Kanpur 208016, UP, India. Additional authors for this research include K. Prajapat and S. Ray-Chaudhuri.

Keywords for this news article include: Kanpur, India, Asia, Structural Engineering

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Source: Journal of Engineering


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