|
intrepid44
Original Poster
638 posts
70 months
|
Some interesting comments, some more useful than others. As I said it is only a preliminary design, and hence not in any great detail.
I'll be using Ansys for sturctural analysis, so I doubt there'll be any particuarly difficult maths to do.
|
|
|
intrepid44
Original Poster
638 posts
70 months
|
Just thought I'd get my other bridge up, just finished it off tonight, although I did most of it before Christmas, but got put on hold due to exams.  As can be seen it's quite a different design, still only an early preliminary and hence not in huge detail, no textures applied yet either, and I haven't altered the steps to suit the British Standard yet, but that should be easy enough, just need to find it and have a good read. Anyway that's enough rambling/excuses from me for now. So let me hear your thoughts.
|
|
|
Sgt Bilko
1,553 posts
85 months
|
Long way to tumble down those steps
|
|
|
intrepid44
Original Poster
638 posts
70 months
|
Sgt Bilko said: Long way to tumble down those steps Indeed it is, hence I'll need to check the standards for it, and see what the requirements are. Will probably have the steps double back on it self, in a later version.
|
|
|
Slagathore
3,745 posts
62 months
|
Is that meant to be suspended? That's a pretty hefty length to span otherwise.
|
Advertisement
|
|
|
intrepid44
Original Poster
638 posts
70 months
|
Slagathore said: Is that meant to be suspended? That's a pretty hefty length to span otherwise. Yeah, it's meant to be suspended, that is a good point though. I will be testing it on Ansys (Finite Element Analysis), to make sure it's strong enough, but I could do this to reduce the span:  Although I don't think it looks quite as neat.
|
|
|
silverthorn2151
3,590 posts
49 months
|
intrepid44 said: Indeed it is, hence I'll need to check the standards for it, and see what the requirements are.
Will probably have the steps double back on it self, in a later version. No more than 16 risers on a flight (he says without checking his building regs) but then building regs don't apply to bridges. The maximum is there to prevent people getting pooped out and having no-where to rest. And it's a long way to fall down.
|
|
|
hyperblue
2,137 posts
50 months
|
intrepid44 said: Some interesting comments, some more useful than others. As I said it is only a preliminary design, and hence not in any great detail.
I'll be using Ansys for sturctural analysis, so I doubt there'll be any particuarly difficult maths to do. Surely you'd want to do some hand calculations to verify your FEA results?
|
|
|
rhinochopig
16,139 posts
68 months
|
You forgot the strippers. The good doctor was right, you can't have a bridge design without strippers.
|
|
|
poing
2,372 posts
70 months
|
Your first one likes identical to the one over the tracks at my local railway station.
Just a thought though. For basic bridges, to cross short distances is there really any need for new designs? It's not like it's a new idea, it just crosses a gap. All you would need to do is call the people that built the last one that covered the same (or similar) distance and ask them for another one. There must be a billion bridges in the world, so just pick one that works.
|
|
|
mxspyder
802 posts
35 months
|
The thing that really makes or breaks a "simple" design are the finer details.
Both bridges are lacking cross bracing, which can be added beneath the deck, but really makes it look bulky.
If a railway station is about to be built, why have you gone for a Victorian style rather than modern?
I agree with the earlier comment about making the bridge look good, but the Calcs will carry equal weight with marking (at least it did for me) - my project was light on Calcs and it really effected my overall grade.
Good luck and keep us updated
Ps - Do you have the Corus guide "Steel Bridge Design for students"? well worth a look.
|
|
|
intrepid44
Original Poster
638 posts
70 months
|
mxspyder said: The thing that really makes or breaks a "simple" design are the finer details.
Both bridges are lacking cross bracing, which can be added beneath the deck, but really makes it look bulky.
If a railway station is about to be built, why have you gone for a Victorian style rather than modern?
I agree with the earlier comment about making the bridge look good, but the Calcs will carry equal weight with marking (at least it did for me) - my project was light on Calcs and it really effected my overall grade.
Good luck and keep us updated
Ps - Do you have the Corus guide "Steel Bridge Design for students"? well worth a look. I will be carrying out hand calculations but I will be relying on FEA for most of the development I would have thought, the kind of hand calculations I will be carrying out will be mostly Euler buckling and versions of beam theory I'd imagine, I've just done a project on a crane hook with similar kinds of requirements and my hand calculations were pretty accurate to the test results and Ansys. So I shouldn't have too much of a problem with that. I have been considering cross bracing, I'll add some in a later version and get it up, although not sure yet of the kinds of forces/moments that it will be required to take in that direction just yet. The reason for the old style design is just that's what we've been instructed to do, it's meant to be for a railway trust, and that's the requirement. And the reason for doing the bridge project, is that with my supervisor I wanted to a design project, and all of the projects we're related to instrumentation/MEMS and I'm not massively interested in that to want to do a project on it. And thanks I'll have a look for that book, cheers.
|
|
|
mxspyder
802 posts
35 months
|
intrepid44 said: mxspyder said: The thing that really makes or breaks a "simple" design are the finer details.
Both bridges are lacking cross bracing, which can be added beneath the deck, but really makes it look bulky.
If a railway station is about to be built, why have you gone for a Victorian style rather than modern?
I agree with the earlier comment about making the bridge look good, but the Calcs will carry equal weight with marking (at least it did for me) - my project was light on Calcs and it really effected my overall grade.
Good luck and keep us updated
Ps - Do you have the Corus guide "Steel Bridge Design for students"? well worth a look. I will be carrying out hand calculations but I will be relying on FEA for most of the development I would have thought, the kind of hand calculations I will be carrying out will be mostly Euler buckling and versions of beam theory I'd imagine, I've just done a project on a crane hook with similar kinds of requirements and my hand calculations were pretty accurate to the test results and Ansys. So I shouldn't have too much of a problem with that. I have been considering cross bracing, I'll add some in a later version and get it up, although not sure yet of the kinds of forces/moments that it will be required to take in that direction just yet. The reason for the old style design is just that's what we've been instructed to do, it's meant to be for a railway trust, and that's the requirement. And the reason for doing the bridge project, is that with my supervisor I wanted to a design project, and all of the projects we're related to instrumentation/MEMS and I'm not massively interested in that to want to do a project on it. And thanks I'll have a look for that book, cheers. Must be nice to work on some older style stuff using new steel sections, all of our work was on modern styles which were pretty dull Steel Bridge Design for students is a free download from Corus, let me know if you have trouble finding it
|
|
|
intrepid44
Original Poster
638 posts
70 months
|
Well my project is coming to an end, just though I'd upload my very very near final design:   Should only be a few small alterations of this design. Let me know what you think!
|
|
|
V8mate
35,299 posts
59 months
|
intrepid44 said: Let me know what you think! Three years at University. Three years. Three years studying the mechanics of design and materials. I guess two staircases with a walkway between them is... functional.
|
|
|
XJSJohn
13,372 posts
89 months
|
V8mate said: intrepid44 said: Let me know what you think! Three years at University. Three years. Three years studying the mechanics of design and materials. I guess two staircases with a walkway between them is... functional. 
|
|
|
dundarach
981 posts
98 months
|
Well I'm not an engineer although I'm sleeping with the daughter of a retired one....
And I play with a lot of Lego and sometimes through no fault of my own, find myself using bridges....
Therefore under the pistonheads rulz I'm an expert...
I like em
I like em all
More over they're better without the ramps - who knows, perhaps there's ramped access eslewhere on this here station!
|
|
|
zac510
4,979 posts
76 months
|
intrepid44 said: Yeah, it's meant to be suspended, that is a good point though. I will be testing it on Ansys (Finite Element Analysis), to make sure it's strong enough, but I could do this to reduce the span: Although I don't think it looks quite as neat. I like this one, it looks good but I can't speak for the engineering aspect. From design perspective, would it be possible to make the stairs curve towards and meet in the middle of the bridge? So if you were to walk across it you would walk in a shallow U-shape or arc? Even neater if the opposite side curved down in the opposite direction like an S.
|
|
|
davepoth
20,186 posts
69 months
|
intrepid44 said: Well my project is coming to an end, just though I'd upload my very very near final design: Should only be a few small alterations of this design. Let me know what you think! I know it's far too late to say this but it seems clumsy. Since the sides of the bridge have to be so high and solid (presumably due to the requirements of the railway) it would have made sense to make the sides structural to avoid having so much bulk.
|
|
|
Vieste
9,195 posts
30 months
|
This daughter you are sleeping with could you give us some pictures they might bridge a gap *gets goat*
|
|
