MACE20082 - Modelling and Simulation - Half-Span Model for The Bridge - Report Writing - Engineering Assignment Help

Assignment Task

Background information
The highways department need your help with the assessment of a motorway bridge over the M4 somewhere near Reading. Due to some budgeting cutbacks, they only have very limited computing resources and their ‘engineer’ is actually only trained in architecture. The department needs to develop a good understanding of the structural behaviour of the bridge in order to undertake some much-needed repair work. The bridge in question is shown in the photograph in Figure 1. The bridge features two outer spans and a central span, which are in fact continuous over the vertical supports. Where the bridge meets the ground at both the vertical supports and the ends of the outer spans, no moments are transferred into the foundations. Under normal use, the bridge is supposed to carry a uniformly distributed load across its entire width with no other loading considered.

Task
Without using any computer software whatsoever, check the results presented in Figure 2. You should propose a suitable half-span model for the bridge and your check should present a coherent set of diagrams that enable the reactions, bending moments and deflected shape to be checked against each other. It may be helpful to consider the whole bridge first. In addition and using some sensible assumptions, construct a computer model of the half structure and compare its behaviour to your qualitative results. Again, without using any computer software whatsoever, identify the structural model being used by the highways department that has led to the results presented in Figure 2. Making use of all available information provided to you in Figure 1 and Table 1, compare the relative efficiency of assuming that the central and outer spans are continuous against assuming that they are not. Compare the relative efficiency of including a central support. Assume instead that the bridge is it be made entirely of steel – are your GSA/computer results.

Your report should have the following features:
(1) A careful explanation of your analysis assumptions;
(2) A precise description of the computer models being used (i.e. element types, boundary conditions, loading, geometry, materials);
(3) Hand-drawn qualitative analysis diagrams integrated into your report in an organised manner;
(4) Screen shots of computer analysis outputs (e.g. bending moment diagrams, deflected shapes, etc.) should feature appropriate annotations.

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