Analysis Of the Cable - Stayed Bridge by Varying Cable Position at Deck Level

Abstract Cable-stayed bridges have gained significant popularity due to their structural efficiency and aesthetic appeal. The positioning of cables in a cable-stayed bridge plays a crucial role in its overall performance. This research paper presents an analysis of cable-stayed bridges by varying the cable positions at the deck level. The objective is to investigate the impact of different cable configurations on the structural behaviour of the bridge. The study is carried out on Akkar Bridge in Sikkim which is India’s first cable - stayed bridge. The analysis is carried out using CSi Bridge software. Three model of a cable-stayed bridge is developed, considering same cable configurations by applying different conditions. The cables are positioned at different angles and attachment points on the deck, allowing for a comprehensive exploration of their effects. Live loads are taken according to IRC: 6-2017, IRC Class 70R Vehicle load was considered. The structural responses of the cable-stayed bridge are evaluated under various loading conditions, including static and dynamic loads. The time-dependent effects of creep and shrinkage of concrete and relaxation of pre-stressing tendons on stresses and deflection are analysed. Parameters such as bridge deflection, cable forces, and stress distribution are examined to assess the performance and structural integrity of the bridge. The results of the analysis reveal that cable positioning significantly influences the behaviour of the cable-stayed bridge, Changes in cable configuration alter the distribution of forces within the structure, leading to variations in structural response. Optimal cable positions are identified based on minimizing deflection and ensuring efficient load transfer throughout the bridge.