Analytical study of non-linear dynamic analysis of skew bridge

Abstract

After earthquakes, the function of highway bridges is an important issue. The history of major earthquakes helps in the understanding of the performance of bridges during earthquakes. Many parameters affect the response of skewed highway bridges under both service and seismic loads which makes their behavior complex. However, under certain conditions, it may be necessary to analyze a structure to more accurately predict its structural behavior. The current procedure of seismic analysis for new reinforced concrete complex skew bridges and arched bridges is required. The analysis can be performed using a nonlinear dynamic analysis procedure that requires specialized software. The purpose of this study is to understand the behavior of the skew deck slab for different skew angles, understand the nonlinear dynamic analysis procedure, develop a model of the skew bridge, and study the nonlinear behavior of the structure. The analysis of the deck is carried out by meshing in STAAD Pro. Nonlinear dynamic analysis i.e. time history analysis is carried out using SAP 2000. The study also aims to study the mode shapes for a single column with a single degree of freedom. To check the behavior of structure there are four time-histories are applied. The Northridge time history has the maximum response when compared with other earthquakes. The study deals with the case study of a skew bridge that is constructed across the Sina River on Aurangabad Pune road, Ahmednagar dist. Ahmednagar. The length of the bridge is 104m with 8 spans of 13m c/c.

Keywords: Skew angle, IRC live loads, time history analysis, STAAD Pro, SAP2000, IRC 6-2016, IRC-112.