|Apr29-10, 12:17 AM||#1|
design of individual members in a steel truss bridge?
Hi, I have to design a steel structured truss footbridge.
Im using beam anology to determine the correct member sizes.
Having trouble determining the maximum design moment (M*)
Here's what I have calculated thus far:
50m long, 3m depth, 3.125m spacing
Self Weight Preliminary Design
W*=8kN/m per truss
After trial and error, all satisfy N*<Nt,Nc
From this point onwards, how do I solve for M*<Mb?
And do I solve M*<Mb individually for all members?:
|May9-10, 01:15 PM||#2|
M* was for the beam analogy, and it produced N*. Provided the loads are at the nodes only, then the only M is from self-weight of a member, and you need not check any further.
|May9-10, 01:19 PM||#3|
On second thoughts, if the compression flange at the top is unrestrained against lateral buckling, then you do need Mb for the whole truss. That's a hard one. It depends on your whole design concept and where restraint is.
|bending moment, chords, steel, truss, webs|
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