Question
Download Solution PDFIn the bridge trusses, The greatest economy of material is obtained if the diagonals have a slope between ______ with the horizontal.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
- Design engineers normally try to keep it at 45°to 60° as it is the best compromise.
- There are advantages in having a steeper angle for the diagonal members and also disadvantages.
- Greater depths with lesser number of panels and steeper angles result in lesser chord forces. But that also results in increase in the number of panels and consequently more diagonal members and and also vertical members, thus increasing amount of fabrication work.
- Deciding the optimum panel widths, the optimum truss depths and the optimum angles for the diagonals is a skilled trial and error task for the designer.
- Most designers start with 45° and then fine tune it to a little more or a little less on a case to case basis.
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