Comparison Between Push Over and Upper Bound Pushover Analysis of R.C. Bridge

  IJETT-book-cover  International Journal of Engineering Trends and Technology (IJETT)          
  
© 2014 by IJETT Journal
Volume-10 Number-12
Year of Publication : 2014
Authors : Jasmin A. Gadhiya , Anuj K. Chandiwala
  10.14445/22315381/IJETT-V10P311

MLA 

Jasmin A. Gadhiya , Anuj K. Chandiwala. "Comparison Between Push Over and Upper Bound Pushover Analysis of R.C. Bridge", International Journal of Engineering Trends and Technology (IJETT), V10(12),559-564 April 2014. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group

Abstract

After 2001 Gujarat Earthquake and 2005 Kashmir Earthquake, there is a nation-wide attention to the seismic vulnerability assessment of existing important structures. There are so many literatures available on the seismic evaluation procedures of multi-storeyed buildings using pushover analysis. As we know bridge is a very important structure in any country but there is no much effort available in literature for seismic evaluation of existing bridges. Bridges extends horizontally with its two ends restrained and that particular characteristic make the dynamic behaviour of bridges different from building. Modal analysis of a 3D bridge model reveals that it has many closely-spaced modes. Participating mass ratio for the higher modes is very high. Therefore, pushover analysis with single load pattern may not yield correct results In order to address this problem, the aims of the present study was to carry out a seismic evaluation case study for an existing RC bridge using nonlinear static (pushover) analysis and upper bound push over analysis and suggest whichever is better to understand bridge structural behaviour. A 12-span existing RC bridge was selected for the case study. Standard pushover analysis using FEMA 356 (2000) displacement coefficient method and an upper bound pushover analysis method in which we are considering higher mode effects were used to analyse the bridge. The evaluation results presented here shows that the selected bridge does not have the capacity to meet any of the desired performance level.

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Keywords
Modal Analysis, push over analysis, target displacement