Reference no: EM132305362
Computer Aided Engineering
1 Outline
Pedestrian/Bicycle overcrossings represent one of the most crucial elements of a community's non-motorised transportation network. They are the critical links joining the areas separated by a variety of "barriers" like rail lines, rivers or highways. A truss bridge is a type of overcrossing where the connected elements of the bridge form triangular units. Trusses are rigid and transfer loads from single point to a wider area.
While designing the elements of a bridge factors like cost, design life, loads, deflections, dynamic behaviour, material etc. have to be analysed to ensure the safety and reliability of the structure.
On a shared bridge, there are three main types of loads to be considered during analysis -
• Dead load: Weight of deck, Weight of any railing/supports, self-weight of the structure.
• Live Load: Pedestrians, Cyclist, Wind.
• Moving Load: Loading of a moving service vehicle
2 Objectives
The aim of this project is to conduct a finite element based structural, modal and harmonic response analysis on a truss bridge. The members of the system must be investigated for multiple cases to ensure the safety and performance of this system.
Each student is assigned a total length and width that you are to use and adjust the beam profiles accordingly
Then, you are to assign appropriate Beam Profiles to the given model in SpaceClaim and conduct a Modal analysis to review the natural frequencies at 20 mode shapes.
For the modal and structural analysis, you are to consider -
• The vibrational frequency of members at different mode shapes with application of Standard Earth Gravity. (No Frequency is Zero Hz)
• Assigning appropriate materials for the deck and Beams.
• Based on the results of initial analysis try to modify the beam profiles, material of deck and bridge to reduce the stress concentration with overall weight of the bridge. All the supports and boundary conditions must remain the same.
• Meshing strategy to ensure type of and good element quality especially in areas of high stress concentration.
• The boundary conditions (loads and supports) are modelled and provide accurate representation of the following loading cases;
1. Dead load where only the weight of the structure from gravitational acceleration is considered.
2. Uniformly Distributed load of 5 kPa as per the design standards below.
During post processing you must analyse the stress and deformation contours of the bridge, comment on the stress development within the structures.
5 Technical Report Layout
The report can be laid out as follows:
- Use size 12 font for the body text, and format section and titles accordingly.
- Font can be Timed New Roman, Calibri or similar.
- Use spell check and read your assignment before submitting.
- Reference figures and other sources of information. Use a referencing tool
- Use the numeric IEEE style type.
- MAX 2000 words! Be concise!
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Attachment:- Computer Aided Engineering.rar