4rth year minor project qseem
DESCRIPTION
cable stayed bridge analysisTRANSCRIPT
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MINOR PROJECT REPORT
ON
Analysis and Design of cable Stayed Bridge Using Staad PRO.
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Outlines of the Minor Project Report
Objectives of the study
Scopes of the study
Flow chart of the study
Component parts of the cable-stayed bridge
Design procedure
Implementation program
Expected outcomes
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Objectives of the study
To get knowledge on design and analysis of a superstructure of cable-stayed highway
bridge
To know the components of cable-stayed bridge
To have some knowledge of the design specifications for highway bridge published by
American Association of State Highway and Transportation Officials (AASHTO)
specifications
To get better knowledge on practices and standards in bridge design
To get detail information on the variation of joint forces in stiffening truss of cable-
stayed bridge
To be skillful for the way how to use STAAD-Pro software
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Scope of the study
Only superstructure of cable-stayed bridge will be designed
AASHTO design specifications and HS 20-44 loading will be used
The preliminary design and joint design will be done by STAAD-Pro software
The effect of thermal change, wind force and earthquake effect will be considered
The variation of joint forces in stiffening truss which mainly supports the floor of
cable-stayed bridge are determined
Anchorage, substructure and construction methods are not involved in this study
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Literature Study
Design Configuration
Modeling for Analysis
Construction Methods and Procedures
Analysis and Design
Final Design and Result
Fig. Flow chart of the study
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Component Parts of Cable-Stayed Bridge
1. Cables
2. Cable System
3. Pylon
4. Stiffening girder or Truss
5. Cable anchorage and Connection
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Types of cables
Cables
Cables are the most important elements of a cable-stayed bridge.
They carry the load of the girder and transfer it to the tower and the
back-stay cable anchorage.
Cables are tension members.
New Parallel Wire Strand
Locked coil Strand Helical Strand Bar Bundle
Seven Wire Strand
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Cable System
Three basic arrangements have been developed for the longitudinal
layout of the stay cables. They are
Radial System
Harp System
Fan System
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Number of Cable Planes
The three basic transverse cable of configurations are following;
(a) Single Plane
(b) Double Plane
(c) Triple Plane
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Pylon or Tower
The design of the pylon must adapt to the various stay cable layouts.
The primary function of the pylon is to transmit the force arising from
anchoring the stays and these forces will dominate the design of cables.
Tower configurations for single-plane cable
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Tower configurations for single-plane cable
Tower configurations in the case of the high installation position for girder
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Stiffening Girder
The role of the stiffening girder is to transfer the applied loads, self
weight as well as traffic load, into the cable system.
The traffic load is acting on the deck of the girder, and both the dead
load and wind area in most cases are larger for the girder than for the
cable system.
Stiffening girders may be I girders, trusses and box girders.
The stiffening truss will be made as a space truss comprising four
chords connected by four diagonal bracings, two vertical and two
horizontal.
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Bracing System
The bracing system used in stiffening trusses are generally the same
as found in the other trusses with constant depth.
Three types of bracing system for the vertical main trusses . They
are
1. Warren truss
2. Pure warren truss
3. Pratt truss
(a) (b) Warren truss
Pratt truss Pure warren truss
Figure; Relevant Bracing Systems for the Main Trusses
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Bridge Type - Cable-Stayed Bridge
Total Length of Bridge - 200 m
Span Arrangement - 3 spans arrangement
Main Span - 100 m
Side Span - 50 m (each)
Clear width - 10m
Side Walk Width - 1.5 m (each)
Pylon (or) Tower - H Type
Truss Type - Warren Truss Type
Cable type - 7̋ΦParallel Wire Strands
Cable System - Fan type
Design Procedure
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Implementation Program
Literature study on proposed bridge
Configuration of proposed bridge
Preparation for analysis of bridge
Modeling analysis of bridge using STAAD-Pro software
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Model of Cable Stayed bridge in Staad PRO
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Assigning Support in Model
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Assigning of Material in Model in Staad PRO
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Assigning of Material in Model in Staad PRO
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Assigning cable properties in Model
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Designing Slab deck properties in Model
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Loading done in Model
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Work to do
Analysis is to be done for: • Displacement
• Bending Moment Diagram • Axial stress • Bending stresses • Combined axial and bending stresses • Forces in each member of bridge
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THANK YOU
Made By: Abhishek Anand Divyani Saini Mohammad Qasimuddin Mohmad Mohseen Lovnish Khyaliram Ritul shrivastava Shubham Gusain
Submitted To: Dr. Deep Gupta Head of Department, Civil Engineering, College of Engineering Roorkee