Seismic analysis of skewed multi-span Steel Girder Bridge
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2016, Vol 4, Issue 5
Abstract
A bridge is an important component of the road transportation network. Its performance during and even after an earthquake event is quite crucial to provide relief as well as for security and defense purpose. Most of the past seismic studies on bridges have focused on regular bridges with no skew. However, past earthquakes and studies have shown that skewed bridges are more susceptible to earthquake damage, specifically caused due to coupled response. Therefore, there is a need for more research to study the effect of skew angle and the other relating factors on the performance of highway bridges. This paper examines the seismic performance of a three-span steel girder bridge with skew angles from 0 to 60 degrees, analytically. The bridge was modelled using finite element (FE) method using SAP2000. Different types of analysis were considered on both models such as: modal response spectrum and nonlinear static pushover analyses. The results of finite element (FE) and modal analysis are presented to study the influence of skew angle on the natural frequency for the entire skewed bridge. On the other hand the structural response for the superstructure covering deck force, moment and displacement, base reaction, force acting on bent column and bearings subjected to above earthquake forces is also studied. Finally it can be seen that the effect of skew angle and interacting parameters were found to have significant effect on the behavior of skewed highway bridges. The analytical results have indicated that the skewed bridge responses are quite different from the non-skewed bridge and varying with the skew angle.
Authors and Affiliations
S. Muhammad Hasan, N. Sakthieswaran, G. Shiny Brintha, O. Ganesh Babu
Keywords
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