International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1540 Study on Parametric Behaviour of Box Girder Bridges under Different Radius of Curvature and Varying Span Abdul Khader A S 1 , A R Pradeep 2 1 M. Tech Student, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India 2 Assitant Professor, Department of Civil Engineering, SSIT, Tumkur-Karnataka, India -------------------------------------------------------------------------***------------------------------------------------------------------------ Abstract: A-box girder flyover is a transport system in an urban area with a high capacity, frequency and the grade separation from other traffic. Box girder flyover is used in crowded cities, crossover junctions, and metropolitan areas to transport large numbers of people. An elevated carriage way system is more preferred type of transport system due to ease of construction and also it makes urban areas more accessible without any construction difficulty. Here the present study focuses on the analysis of box girder, of an elevated box girder structural system. 1. Introduction: Urban cities in India, have experienced phenomenal growth in population in the last two decades. To meet the traffic demands, Flyovers, Tunnels & Elevated Highways etc. have been constructed. The viaduct of a bridge has box girders of single cell, double cell, multi cell etc. There are different structural elements for a typical box girder bridge. Box girders have gained wide acceptance in freeway and bridge systems due to their structural efficiency, ease of construction, better stability, serviceability, economy of construction and pleasing aesthetics. Analysis and design of box- girder bridges are very complex because of its 3D behaviours consisting of torsion, distortion and bending in longitudinal and transverse directions. A box girder is particularly well suited for use in curved bridge systems due to its high torsional rigidity. High torsional rigidity enables box girders to effectively resist the torsional deformations encountered in curved thin-walled beams. There are three box girder configurations commonly used in practice. Box girder webs can be vertical or inclined, which reduces the width of the bottom flange. 2. Dynamic analysis of railways bridges under high speed trains; Ashish gupta; Amardeep singh ahuja. In dynamic analysis, the structural damping is an important key parameter. The damping properties are important in dynamic analysis, but they are often not well known. The response of a bridge structure due to moving loads, and the magnitude of the vibrations of the structure, depends heavily on the structural damping capacity [3]. In risk of resonance, damping is especially important. Damping is a property of building material and structures, which usually reduces the dynamic response. Damping is dependent on the material of the railway bridge and on the state of the structure [4], for example presence of cracks and ballast. The magnitude of damping also depends on the amplitude of vibrations of the bridge. After passages of vehicles, or other excitations of bridges, damping causes the bridges to reach these states of equilibrium. Predicting the exact value of damping of new bridges is unfortunately not possible. In cases of designing new bridges, damping tables are used, which gives the lower limits of the percentage values of critical damping , based on number of past measurements. For already existing bridges, the damping values can be deduced by calculating the logarithmic decrement from free vibration measurements. It is almost impossible to take all sources of damping of vibrations of railway bridges into account in engineering calculations, because of the high number of them. 3. Pushover Analysis of Balance Cantilever Bridge N SOBHANA 1 , A RAMAKRISHNAIAH 2 , P SOMUSEKHAR 3 Pushover analysis is a magnitude of target displacement gives seismic accomplishment of structure. Target displacement shoes global dimension of the structure is expect to design the earthquake, Center of mass of roof displacement. The target displacement for the MODF structure has been evaluated. The equivalent SODF domain the shape factor, the assumption is always predicted. Under the non linear static a model show the inelastic response to target displacement, which result the force. Model is subjected to lateral forces until target displacement is increased. So, building collapses. In this way target displacement is experienced the architecture earthquake.