Transcript result & discussion
ANALYSIS AND DESIGN OF PRESTRESSED CONCRETE BRIDGE (A Case Study of Oyun River along Tanke-Yakuba) By Dauda, A. Y.
(10/30GB105) PROJECT SUPERVISOR: DR. S.A. RAJI July, 2014
The aim of this project is to analyze and design a prestressed concrete bridge to link Tanke F division area with Apata Yakuba in Ilorin. The specific objectives used in achieving this are; Obtaining measurement for the width and depth of the river Determining the reactions at the bridge support, stresses on girders and walls, and deformation on the bridge using Midas CIVIL engineering software
SCOPE AND LIMITATION
This project focuses on analysing and designing a prestressed concrete bridge. The project is limited to the modeling, detailed analyses and design of the bridge with Computer Aided Design software (MIDASCivil) and comparing results with that obtained from the manual analysis of a major girder of the bridge..
A bridge is a structure erected to span natural or artificial obstacles, such as rivers, highways, or railroads, and supporting a footpath or roadway for pedestrian, highway, or rail road traffic. A number of different methods may be used to classify bridges. Bridges can be classified according to materials (concrete, steel, or wood), usage (pedestrian, highway, or railroad), span (short, medium, or long), or structural form (slab, girder, truss, arch, suspension, or cable-stayed).
Modeling of the bridge Computer aided analysis of the bridge Computation of reactions, stresses and deformations on the bridge using Midas CIVIL engineering software Manual Analysis of the bridge to serve as a check
COMPUTER MODELLING PROCEDURE USING MIDAS CIVIL
RESULT & DISCUSSION
From manual and MIDAS calculations
The stresses in girder (No 895) are
1 BOTTOM 2 TOP
20.89𝑁/𝑚𝑚 2 −1.2𝑁/𝑚𝑚 2
30.3𝑁/𝑚𝑚 2 −1.72𝑁/𝑚𝑚 2
Based on the results from both manual and computer application, it can be concluded that the bridge girder (No 895) has a stress of and 20.89𝑁/𝑚𝑚 2 (𝑡𝑒𝑛𝑠𝑖𝑙𝑒 𝑠𝑡𝑟𝑒𝑠𝑠) −1.2𝑁/𝑚𝑚 2 𝑐𝑜𝑚𝑝𝑟𝑒𝑠𝑠𝑖𝑣𝑒 𝑠𝑡𝑟𝑒𝑠𝑠 at the bottom of the beam at the top of the beam from the manual calculation while the computer aided analysis gave 30.3𝑁/𝑚𝑚 2 (𝑡𝑒𝑛𝑠𝑖𝑙𝑒 𝑠𝑡𝑟𝑒𝑠𝑠) 𝑚𝑚 2 𝑐𝑜𝑚𝑝𝑟𝑒𝑠𝑠𝑖𝑣𝑒 𝑠𝑡𝑟𝑒𝑠𝑠 at at the top.
the bottom and −1.72𝑁/ 2.
The use of the finite element method of analysis was justified and the application of the MIDAS/ Civil software was found to be time saving, less tiring and of higher accuracy compared with rigorous manual method of analysis.
It is recommended that the use of this software be treated in broad term for all engineers due to its wide applications.
More research should be carried out in the future on better ways of structural modeling and analysis of bridge.
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