DESIGN OF A HIGHWAY BRIDGE

Bridges are important to everyone. But they are not seen or understood in the same way by everyone, which is what makes their study so fascinating. Everyone is looking at the same bridge, but it produces different emotions and visual images in each.“A structure that span an opening or gap, 6 m or larger, such as: a water way (River, canal etc.), a valley, another roadway or railway lines is called a bridge. Further the term bridge is used for the structures built to continue traffic load, pedestrian traffic or utility lines across a gap in a roadway.” (Ref. AASHTO 1.2)

In this project, attempt has been made to elaborate procedures for designing of various components of pre-stressed concrete girder bridge. This includes general introduction of bridges and their design description. This project also deals with the details of pre-stressing methods and their design procedure according to AASHTO provisions. A complete design example along with structural drawings of slab and girders has also been accomplished. Spread sheets have been developed to facilitate the design procedure.These sheets are capable of designing girders with desired section properties and also are capable of selecting AASHTO specified girders. To understand the structural configurations bridge has been modeled on SAP bridge wizard.

Structural drawing

Conclusions

References◊ AASHTO LRFD Design Specifications for Bridges◊ Edward G. Nawy, Reinforced Concrete 5th Ed., Pearson Prentice Hall, New Jersey◊ Nilson, Aurther H. Design of prestressed concrete 2nd Edition, John Wiley & Sons, New Yark◊ Z.A Siddiqi, Concrete Structures, 2rd Ed. Part I&II, Help Civil Engineering Publisher, Lahore, 2012.

☞ Project Advisor:Engr. Muhammad Mazhar Saleem

Assistant Professor (Department of Civil Engineering)☞ Project Group Leader:

Hafiz Ahmed Waqas (2011-Civil-179)☞ Project Group Members:

Muhammad Usman (2011-Civil-161)Syed M. Imran Shah (2011-Civil-174)Muhammad Abdullah (2011-Civil-176)

Department of Civil EngineeringUniversity of Engineering and Technology, Lahore

Preparation of Structural DrawingsDeck Slab, Side Barrier, Girders and Tendon Profiles

Modeling using SAP Bridge WizardUnderstanding the structural configuration

Development of Spread Sheets for DesignDesign of Girders/AASHTO Girders Selection

DesignDeck Slab, Exterior and Interior Girders

Analysis of Bridge Components Methods for Analysis, Load Calculations

Literature ReviewHistory, Types, and site selection for Bridges

Design Process

Modeling on Bridge Wizard

Bridge Components

Abstract

Introduction

Design Results

Deck Slab and Side Barrier

Tendon Profile Calculations

Design for both of exterior and interior girders was performed, and heavier girder was provided, so that a symmetrical deck is obtained.

AASHTO HL-93 design traffic loading has been used for analysis and design of the bridge. But later on design adequacy should be checked according to Pakistan code of practice class A, class B loading for highway bridges.

Specified AASHTO highway girders are available for specific span and loading conditions. However, in case these girders are inadequate, then special girders may also be designed and manufactured. The developed spread sheets in this project also address the above said purpose.

Project Participants