Abstract: A cable-stayed bridge is being built more frequently every day. Cable-stayed bridges are a good option for crossing waterways or crowded metropolitan areas because they combine structural effectiveness, aesthetic perks, and urban design advantages. This work investigates the dynamic analysis of cable-stayed bridges using various cable arrangements. The reaction forces of deck are transmitted to the pylon by the cable. Pylon transfers the weight of cables to the foundation. Modelling and analysis of the cable-stayed bridge with different cable arrangements are done using the MIDAS CIVIL software. The arrangement of the cables in ‘Fan’, ‘Harp’ and ‘Semi-fan’ shapes were taken into consideration. All three bridges share the same materials and sectional characteristics, while the moving load is provided according to IRC:6-2000 loading. Three nonlinear dynamic behaviour of bridges were examined as part of the seismic analysis part using Time History data from the 1940 El Centro earthquake. Many factors are examined, including axial forces, shear forces, and bending moments. And using time history analysis, six different modes were examined. Unit pretension and optimal pretension were studied between three cable arrangements of cable stayed bridges. To understand the advantages of cable optimisation in cable-stayed bridges. According to the result, as complexity rises, structural behaviour changes. After comparing the results, it is determined which cable arrangement performs the best and most poorly. And optimization of cables plays vital role in stability of cable stayed bridge is observed.

Keywords: Fan, Semi-fan, Harp, Cable stayed bridge, Time history

| DOI: 10.17148/IARJSET.2023.10930