NDLI: Modal pushover analysis of skewed bridges-case study of Jack Tone Road On-Ramp overcrossing

Content Provider	Springer Nature Link
Author	Ghotbi, Abdoul R.
Copyright Year	2016
Abstract	Modal Pushover Analysis (MPA) procedure was applied to a skewed-abutment bridge. Dynamic properties of the bridge were computed using an eigenvalue analysis. Base shear versus lateral target displacement (v $_{ bn }$-u $_{ rn }$) of the monitoring point was generated for each mode of vibration for both longitudinal and transverse directions. Dynamic properties of the bridge were then applied to (v $_{ bn }$-u $_{ rn }$) curves to generate capacity spectrum curves for various modes. Target displacement of each mode was computed by considering both capacity spectrum and demand spectrum (obtained from ground motion) assuming the bridge as a Single Degree of Freedom (SDOF) system. The corresponding displacements were then converted to a new set of displacements for a Multi Degree of Freedom (MDOF) system (actual bridge). Using these displacements, a set of new pushover analyses was carried out for each mode and response quantities were recorded. The recoded responses were then summed up using a modal combination technique for both longitudinal and transverse directions. Overall response of the bridge system considering a bi-directional ground motion was computed by combining the longitudinal and transverse responses. Estimated errors which were computed with respect to the results of the Nonlinear Dynamic Analysis (NDA) proved that MPA can be deemed as a promising tool for skewed bridges which can be used instead of NDA so that computational expenses can be decreased significantly while maintaining a reasonable accuracy.
Starting Page	1948
Ending Page	1957
Page Count	10
File Format	PDF
ISSN	12267988
Journal	KSCE Journal of Civil Engineering
Volume Number	20
Issue Number	5
e-ISSN	19763808
Language	English
Publisher	Korean Society of Civil Engineers
Publisher Date	2015-10-23
Publisher Place	Seoul
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	skewed bridge MPA NDA response quantities modal combination Civil Engineering Industrial Pollution Prevention Geotechnical Engineering & Applied Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Civil and Structural Engineering

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