IJERT-Dynamic Analysis of Cable Stayed Bridge under Moving Loads with the Effect of Corrosion of Cables (original) (raw)
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Dynamic Analysis of Cable Stayed Bridge under Moving Loads with the Effect of Corrosion of Cables
International Journal of Engineering Research and, 2015
The effect of failure of cables under different levels of corrosion on the structural behavior of cable stayed bridge will be a prominent aspect for the analysis of a cable stayed bridge. With respect to that view, the static response of the cable stayed bridge moving loads subjected to corrosion in different levels has been studied in the present work. The cable stayed bridges are subjected to loads and corrosion in fluctuating manner which will generate the differential displacement of pylon and deck. H shape pylon and single shape pylon are analyzed by time history analysis for 0%, 10% 25%, 50% and failure stages of corrosion. And the load received by the moving load on pylons in different locations and parameters like displacement, acceleration, period and frequencies are also studied. The above studies give the output that the pylon in the middle location is under least displacement compared to the end locations and the H shaped pylon expresses suitability within permissible limits. The time history studies on Bhuj and Elecentro earthquakes are also extracted, analyzed and checked for the suitability of H shape and Single pylon.
Effect of cable degradation on dynamic behavior of cable stayed bridges
Jounal of Civil Engineering Research, 2013
In the present work a cable stayed bridge of fan type arrangement is analysed for static and dynamic load. The analysis is done with all the cables under normal condition, d ifferent percentage of corrosion of one cable and the failure of one cable due to excessive corrosion. The analysis is performed using fin ite element method software MIDAS Civ il. The software is validated with simple bridge model. The bridge is analysed for moving load case as per the IRC 6-2000 and also for earthquake load (Time History of El Centro) and for different load co mbinations. The effect on axial forces in cab le, deflection of deck, natural frequency, mode shape of the structure and earthquake response of the Cable Stayed bridge is studied.
Cable stayed bridges are becoming more popular all around the world due to its flexibility, aesthetic appearance, efficient utilization of material and relatively low construction costs. Cable stayed bridges consist of one or more pylons with cables supporting the deck. Due to its flexible nature, cable stayed bridges are very sensitive to lateral loads. Also it has been observed that changing the cable configuration can cause change in force acting on bridge components, resulting change in their dimensions and finally cause the overall construction costs. In the present study, an attempt has been made to analyze the seismic response of cable stayed bridges. Three cable configurations fan, semi-fan, and harp have been considered with H-shape pylon. Effect of seismic action has been studied with varying span length of 700m, 850m, 1000m using MIDAS civil software. Non-linear time history analysis has been performed considering time history El-centro 1940 earthquake and cable forces, bending moment, axial force, torsion in pylon and deck has been computed. Finally, comparison is carried out considering different parameters to provide the best suitable cable configuration.
Effect of dynamic load analysis on pylon configurations of cable stayed bridges
International Journal of Advance Research and Innovative Ideas in Education, 2016
Man’s achievement in field of Structural Engineering is evident from world’s largest bridge spans, tallest structures etc. In the recent years, cable stayed bridges have received more attention than any other bridge mainly, in the United States, Japan and Europe as well as in third-world countries due to their ability to cover large spans. Cable-stayed can cross almost 1000m (Tatara Bridge, Japan, Normandy Bridge, France) A study is carried out to find the dynamic effect on different shapes of pylons of a cable stayed bridge. The different shapes of pylons considered here are H type, A type, Spread pylon system with 19° and 30° spread. The central span of the cable stayed bridge is also varied as 700m, 850m, 1000m to study the combined effects due to shape and span. The study is carried out by taking live load according to IRC 6:2014, IRC Class A and Class 70R vehicle load was undertaken. A Dynamic analysis in the form of Linear Time-history is also carried out using El-Centro groun...
Study of Cable Stayed Bridge with Different Pylon Arrangement as Per Irc Loading
2020
The cables in a cable stayed bridge are exposed to corrosion, abrasion and fatigue processes which may cause a reduction in their section and a decrease in their resistance capacity. A bridge is a structure, which connects two ends of obstacles such as river, valley, other road and railway lines for the purpose of providing small routes as possible for safe journey. There are many different designs that each serve a particular purpose and apply to different situations. A cable stay bridge consist of cable, deck, pylon and foundation. Literature survey revealed that comparative study of different type of pylon for cable Stay Bridge. The cable forces and nodal vertical displacements before and after the loss of cable is investigated and compared. The analysis results show that cable loss leads to the redistribution of load to adjacent cable. The effect is significant when the cable loss is in middle or far to pylon as compared to loss of the cable near to pylon. It is concluded throug...
Parametric Study on Nonlinear Static Analysis of Cable Stayed Bridges
JES. Journal of Engineering Sciences, 2013
This study is done to discuss nonlinear static behavior for cable-stayed bridges, hence develop a set of consistent design as well as a feasibility study of long span cable-stayed bridges over Nile River. In order to accomplish this goal, a thorough investigation of important key design parameters to determine the behavior of cable-stayed bridge and identify any gaps in current knowledge is done to be filled in order to enable the formation of a consistent set of design recommendations. Three span cable stayed bridge has been analyzed, the effects of the variation of different key design parameters: cross section of cables, cable layout either fan or harp pattern, pylon height to span ratio and mechanical properties of deck and pylon on the straining action of the bridge elements are investigated. The loads on the cable stayed bridge are a symmetrical load such as the own weight of all structural elements and live loads. The results related to the major factors to choose the ratio between the bending stiffness of a deck and axial stiffness of the cable to reduce bending moments and deflections in the deck and pylon are presented and discussed. Finally, some conclusions related to the cable stayed bridge's analysis/design are drawn.
Dynamic Response Study of a Single Tower Cable Stayed Bridge using Finite Element Method
Journal of Applied and Emerging Sciences, 2020
Cable stayed bridges are most widely used in the modern medium to long bridge construction due to their efficient response, economic viability, faster construction, and eye-catching aesthetics. The dynamic response of a single tower cable stayed bridge is studied by performing both nonlinear static and dynamic analyses using finite element method based software ANSYS. A three dimensional bridge model was developed using ANSYS. The steel cables were simulated using a single element approach to minimize the time and data use. Due to the complexity of cable stayed bridges, it is tried to avoid the convergence problems by adopting the displacement convergence approach. The bridge exhibits complex modal shapes due to the coupling effects for the free vibrations. The response of the bridge in vertical direction is more elastic and flexible as compared to the longitudinal and transverse direction. Response of the critical sections of girder, tower, and cables was also studied by time-history analysis using the ground acceleration data of the EI-Centro 1940 earthquake. A 10 second ground data with 0.0001 second time step was used. It was observed that stiffness in the vertical direction is a key player in the dynamic behavior of the cable stayed bridge. The response of the right and left span is similar which adds to the accuracy of the analysis. Time history analysis of the bridge shows that the largest displacements or peak responses are not related to the peak ground accelerations, rather they are dependent on many other factors like bridge stiffness, nature of the earthquake ground excitations and mass distribution. However, the results show the general trend of cable stayed bridges.
Analysis of the behaviour of Cable stayed bridge with different types of Pylon
E3S Web of Conferences, 2021
Cable stayed bridges are known for their good stability, It has been the most favorable use of structural design, for comparatively low designing and maintenance costs, and for effective structural characteristics. Therefore, this type of bridges are gaining popularity and are generally selected for long spans when compared to suspension bridges. A cable stayed bridge comprises of pylons with cables withstanding the weight of deck. There are different types of pylons i.e. ; H-type pylon, A-type pylon, inverted Y-type pylon, and diamond shaped pylon. In this paper the bridge design, model, and analyses for these different types of pylons is done using STAAD Pro. The comparison for three cases are done on the basis of shear force and bending moment in terms of self weight to obtain the most efficient type of pylon design. The results thus obtained are useful in limiting the drawbacks of other types of pylon.
Mathematical Problems in Engineering, 2012
The dynamic behavior of cable-stayed bridges subjected to moving loads and affected by an accidental failure in the cable suspension system is investigated. The main aim of the paper is to quantify, numerically, the dynamic amplification factors of typical kinematic and stress design variables, by means of a parametric study developed in terms of the structural characteristics of the bridge components. The bridge formulation is developed by using a geometric nonlinear formulation, in which the effects of local vibrations of the stays and of large displacements in the girder and the pylons are taken into account. Explicit time dependent damage laws, reproducing the failure mechanism in the cable system, are considered to investigate the influence of the failure mode characteristics on the dynamic bridge behavior. The analysis focuses attention on the influence of the inertial characteristics of the moving loads, by accounting coupling effects arising from the interaction between girder and moving system. Sensitivity analyses of typical design bridge variables are proposed. In particular, the effects produced by the moving system characteristics, the tower typologies, and the failure mode characteristics involved in the cable system are investigated by means of comparisons between damaged and undamaged bridge configurations.
Non-Linear Analysis of Cable Stayed Bridges
International Journal of Emerging Research in Management and Technology
The concept of cable-stayed bridges dates back to the seventeenth century. Due to their aesthetic appearance, efficient utilization of material, and availability of new construction technologies, cable-stayed bridges have gained much popularity in the last few decades. After successful construction of the Sutong Bridge, a number of bridges of this type have been proposed and are under construction, which calls for extensive research work in this field. Nowadays, very long span cable-stayed bridges are being built and the ambition is to further increase the span length using shallower and slender girders. In order to achieve this, accurate procedures need to be developed which can lead to a thorough understanding and a realistic prediction of the bridge’s structural response under different load conditions.In the present study, an attempt has been made to analyze the seismic response of cable stayed bridges with single pylon and two equal side spans. This study has made an effort to ...