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Sawant, Jyoti P; Vijapur, Vinayak (2013)
Publisher: Journal of Engineering Computers & Applied Sciences
Journal: Journal of Engineering Computers & Applied Sciences
Languages: English
Types: Article
Subjects: Engineering; Civil Engineering, Post-tensioning method, steel structures, post-tensioned trusses, truss strengthening, design parameters, load carrying capacity.
Now a day there is pronounced application of Post-tensioning to steel trusses. The bridges which were earlier designed for lighter loads has to bear the increased load due to rapid urbanization and increased population and thus to replace the earlier bridge is uneconomical and also disrupts the transportation. So, these bridges are strengthened by the application of post-tensioning. Now post tensioning is most widely accepted all over since trusses consume a lot of less material compared to beams to span the same length and transfer moderate to heavy loads.In countries like India where labour cost is less post-tensioning can be utilized to the fullest extent. In the current study post tensioning has been applied to both angular and tubular trusses for 30m span Mansard and Pratt trusses with single and double drape tendons using SAP2000v15 software it has been found that with the application of Post tensioning with single and double drape tendons at the eccentricity of 0.9 m and 1.2 m the pre-stressing force in the members have been reduced. External Post-tensioning is considered in the present study since the tendons are outside the trusses. Here the trusses are examined for member forces, pre-stressing forces at zero deflection at the mid span of the truss, the reduction in the cross sections and weight of the members of trusses
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