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Design of Post Tensioned and Prestressed Concrete Box Girder-Slab for a Bridge Deck

Author(s):

Almas Mohiuddin , Lords Institute of Engineering and Technology, Himayath Sagar, Hyderabad; Waseem Sohail, Lords Institute of Engineering and Technology, Himayath Sagar, Hyderabad

Keywords:

PSC Bridge; Pre-Stressed Concrete Segment; Box Deck Design, I-Beam Deck; Post Tensioned Box Girder; Post-Tensioned Deck Slab

Abstract

Bridge construction today has achieved a worldwide level of importance. Bridges are the key elements in any road network and use of pre-stress girder type bridges gaining popularity in bridge engineering fraternity because of its better stability, serviceability, economy, aesthetic appearance and structural efficiency. I & T-beam bridges are one of the most commonly used types of bridge and it is necessary to constantly study, update analysis techniques and design methodology. Structurally they are simple to construct. Hence they are preferred over other types of bridges when it comes to connecting between short distances. The report examines in detail the application of segmental precast Design of Post Tensioned and Prestressed Concrete Box Girder-Slab for a Bridge Deck in achieving long spans in bridge structures. Numerous examples from throughout the world indicate that such construction can provide an effective means of achieving long span in the range of 100 to 500 ft. Used segmental pre-cast bridge structure member is manufactured in a number of short units which during erection are joined together, end to end, and post-tensioned to form the completed superstructure. Adherence to these simple rules will not prevent all damage in moderate or large earthquakes, but life threatening collapses should be prevented, and damage limited to repairable proportions. Considering the time variant, I have been focused on a box girder of span 40 meters and analyzing it with respect to pre-tensioning and post-tensioning and incorporating the graphs for the various loads and deflections. In this case designing is done using STAAD- Pro software. Software will be used for 3D design model of 40m span Box Girder-Slab for a Bridge Deck & will be tested in order to study its behaviour during the construction process and under permanent loads. Shear force, Bending moment, axial force, base shear, are studied with accordance to earthquake response effects. The analysis results were compared with analytical predictions obtained by means of a prototype model developed for the nonlinear and time-dependent analysis of segmental erected, reinforced and prestressed concrete structures. Generally good agreement was obtained, showing the adequacy of the model to reproduce the structural design of the different elements in the post-tensioned pre-stressed bridge structure.

Other Details

Paper ID: IJSRDV7I60072
Published in: Volume : 7, Issue : 6
Publication Date: 01/09/2019
Page(s): 121-128

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