EMS5CAE – Computer Aided Engineering ANSYS Analysis of an Overcrossing Truss Bridge - Engineering Assignment Help

Assignment Task:

Task:

Outline Pedestrian/Bicycle overcrossings represent one of the most crucial elements of a communities 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 For this task, we will consider only a dead and live load. 2 Objectives and Specifications 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. The structure supplied to each student has been made from 10 mm solid bar. This needs to be changed to a more appropriate I-beam cross section. Each student should select and model two (2) different sections to compare and discuss the effect of each cross section – remember to use your engineering judgment when writing the discussion, i.e., the thickest and heaviest member might give you the least deflection and corresponding frequency response, but are you over-engineering? Use the data in Figure 1 to select your two different I-beams. Also select a thickness of the deck that is appropriate – remember you as the engineer needs to justify this. A bridge with a 500 mm deck might not deflect at all, but does this make logical sense? This means you will need to use SpaceClaim to model two cross sections with an arbitrary length, say 100 mm, then save this on your local drive, see Figure 2. Then, using SpaceClaim, extract the beams and mid-surface of the deck, share topology and move the deck mid-surface so that it aligns with the central axis of the beams. By selecting all the beams, you can assign different profiles in the Beams section of SpaceClaim, under the Prepare tab. You will need to use three analysis systems in ANSYS. The first is a Static Structural, then drag in a Modal system on the solution cell of the Static Structural, Finally, drag a Harmonic Response onto the Modal solution cell. Your analysis should look like Figure 3

Once in ANSYS, you will need to set-up your analysis. Use Structural Steel as the material for the beams and Oak Hardwood for the deck. For your mesh, select an element size that that provides less than 32K nodes, and represents your model sufficiently. Justify your selection. Ensure you have created connections of the bridge frame to the deck. Again, use your engineering judgment and discuss what type of connection you have used and how this represents the physical problem you are solving. For the boundary conditions, you will need to apply a standard earth gravity, a 5 kPa pressure on the deck and fixed supports at the 4 corner nodes of the truss frame, Figure 4 and Figure 5. For your analysis setting in static structural, keep all defaults but discuss the use of Large Deflection; what does it mean and do you need to use it? The modal analysis setting just needs to include 12 modes in total. The Harmonic response needs to have the pressure applied as per the Static Structural, but you analysis setting for the Harmonic repose should include the setting shown in Figure 6. For the post-processing, show and discuss your results in terms of deformations, stresses and strains for the static structural, mode frequencies and shapes for the modal, and frequency response and total deformation for the harmonic analysis.

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