ENGM032: Design of Steel and Composite Bridges Coursework Assignment Brief | UOS

LEARNING OUTCOMES OF ENGM032:

Developing design solutions for steel/concrete bridges

• Assessing possible installation and construction procedures and their implications 
• Comparing  alternative  design  schemes  on  the  basis  of  their  advantages  and disadvantages. 
• Presenting engineering calculations and diagrams/sketches in a clear, organised and efficient way.

COURSEWORK BRIEF OF ENGM032:

Task  

Design the 20m span composite footbridge shown in Figure 1 below, taking account of  both  the  temporary  (construction)  stage  and  the normal  stage  (in-service condition),  and  present  the  calculations  justifying  the  chosen  beam  size  and  the bracing arrangement (see next page). The design should be presented according to EC3  and  EC4  and  the  relevant  NA  supplements  for  the  UK.  The  footbridge  is constructed over a 15m wide river with road access from both sides.  The  following  data  should  be  used  in  the  calculations  at  the  ultimate  (ULS)  and serviceability (SLS) limit states:

Data: 

Figure 1. Cross-section of composite footbridge in this assignment

Required Stages in Design Solution

1. Determine the actions on each of the footbridge beams and choose a sensible preliminary  size  for  the  steel  cross-section.  Provide  evidence  on  how  the preliminary size was chosen.
2. Check design of steel beam in the construction stage, including checks for lateral stability based on the chosen intervals of cross-bracing (the interval should be clearly stated).
3. Although  you  are  not  required  to  design  the  bracing  in  detail,  the  bracing requirement  /  provisions  should  be  discussed  with  the  inclusion  of  sketches.  Explanation  on  how  the  bracing  interval  in  Q2  was  chosen  should  also  be provided.
4.   Determine  the  appropriate  value  of  the  modular  ratio  to  account  for  primary effects of shrinkage, assuming that the relative humidity is 70%.
5. Check the composite beam for bending and shear in the permanent (in-service) condition. Cross-section classification checks should be clearly presented.
6. Calculate  the  design  shrinkage  strain  and  determine  the  shrinkage-induced deflections and stresses in the composite section.
7. Check  combined  stresses  and  deflection  of  the  steel  and  composite  section (including  those  calculated  in  Q6)  at  serviceability  limit  state  assuming  un-propped  construction.  Client  requires  that  deflection  under  imposed  loading  is limited to span/250, and total deflection limited to span/200. A pre-camber of the fabricated steel section up to span/500 is allowed.
8.  Determine  the  shear  connector  arrangement  and  perform  the  verifications  for longitudinal  shear  in  the  slab  in  order  to  provide  adequate  transverse reinforcement.
9. Describe the possible installation/construction procedures for this bridge covering aspects related to fabrication, transportation and erection, in particular.
10. Illustrate  two  other  forms  of  steel  footbridge  that  might  be  considered  for  this case, and briefly mention their advantages /disadvantages over the form selected in this assignment.

MARKING CRITERIA 

The coursework will be marked based on the following criteria:

• Good organisation of the report and clarity of presentation of material.
• Correctness of analysis, associated inputs and assumptions made.
• Quality of sketches/diagrams provided.
• Demonstration of understanding of the engineering significance of the results obtained and their limitations in the light of assumptions made.
• Completeness of the alternatives/scenarios to be considered, as requested by the brief. 

The percentage of marks for each question is indicated in the previous section at the end  of  each  stage  in  the  design  solution.  Marks  are also  allocated  to  design efficiency and clarity/presentation, as shown.  Clearly state any assumptions you are making in addressing the specified stages in the design solution. It is important to discuss/annotate the results demonstrating an understanding of their meaning and significance.  The University grade descriptors against which the work is marked are available in SurreyLearn in the coursework folder.