Shaik Kabeer Ahmed, Chandradhara GP & Gaurai Arun Naik Gaunekar
Department of CivilEngineering N.M.A.M.I.T, Nitte, Karkala Taluk, Udupi Dist, Karnataka, India.
SJ College of Engineering, Mysore,Karnataka, India.


A simplified and practical approach for nonlinear seismic analysis of bridges is proposed. Effciency and effectiveness of the proposed model is discussed.Assessment is carried of inelastic structural behaviour under seismic loads. Study of postel nonlinear analysis to control and evaluate the damage to the structure is done. Have obtained an accurate prediction of the nonlinear response of a bridge structure. Study ofthe plot of response spectrum curves is done.Collection and extraction of da of earthquakes is done. Design and analys history analysis for a T-beam bridge in MIDAS civil is performed. The response spectrum curves for a T bridge for Bhuj earthquake data is obtained. Extraction of results is done from the SeismoMatch software and proposed anidealised design spectra for Bhuj Keywords:Bridges, Seismic, Earthquake, Nonlinear, Analysis, Model, Response, Loads, Bhuj, Acceleration, Velocity, Deformation. I. INTRODUCTION The subject of nonlinear seismic analysis and response of bridges drew increasing attention in the early 1970’s. Since then, research in this particular area has significantly progressed with the research funding given by the following major agencies and organizations Nonlinear modeling of structural systems subjected to severe earthquakes is considered to be one of the most realistic approaches in the analysis and design of common structures. Considerable progress has been made in the past two decades in developing techniques to model the nonlinear behavior of building structures. Many factors have contributed to the rapid development of inelastic models for bridges. Among these are: considerable interest in the behaviour of buildings subjected to strong earthquakes, unsatisfactory seismic performance of many building components, the availability of test data on building components subjected to earthquake type loading, etc. In recent years, non linear bridge analysis has gained momentum because of the need to assess inelastic structural behaviour under seismic loads. Concept of response spectrum During an earthquake, a single-degree-ofsystem’s maximum response is plotted as a function of its natural vibration period Tn or frequency for a given damping value (wn or fn). This can be represented in terms #2,Gaurai Arun Naik Gaunekar astic ta is of the time -beam in India