Just a random, blog-type, architectural construction/design rant.... :-) Maybe, just maybe we can instigate some combination of looking at pictures as pictures and looking at pictures that tell you something... so, metal framing building... off the cuff...
Anyone here ever use tubular sections? Apparently they are useful things in some circumstances, i.e. where you have possibility of lateral loads on things, or where things can twist/subjected to a lot of torsion etc, etc.
One such circumstance, would be at the gable of a large factory, where you need a huge big door. To learn some more feeling for this kind of phenomenon, in the structures of architecture.... I can point you here.
I know, on a bicycle, the manufacturers go to extreme lengths to avoid your bodies energy being drained away into just 'flexing the frame' as opposed to transmitting the energy onto the road/tire point of connection.
Making strange bends at critical places, and using very tiny tolerances between forks, chainstays, seatstays and wheels, using very stiff aluminium material tubular sections, which are machined to be thinner walled in the middle than at the ends... all this design, not to waste those precious cycling kilo-joules.
Bikes are an entirely different set of design circumstances, to building I know, but it just highlights how deeply that some engineers/designers have gone in relation to 'the act of making' something.
Just to get the discussion some way started, I decided to link this image, perhaps others have more? Here is an example of an image, that really shows, how much people 'think' about frame construction... to a real bike user/sport enthuasiast, this is so much more than a pretty picture.
http://www.specialized.com/SBCBkModel.jsp?spid=9693
I feel that with architectural visualisation, the image often 'means' so very little unfortunately, just a statement of fact actually and not something 'I want' to believe. BTW, for those of you, who really find that image confusing without wheels etc, attached, that black post sticking up to the top of the picture is where a saddle would go and ultimately the 'rider' of such a piece of equipment. That frame is for rough, off-road usage... unlike the lean, and minimalist ultra light permanent road surface cycling bikes, that I described above.
Every bit of machining, weld, struting or whatever on a bicycle frame, is more money the consumer has to pay up... And if you are standing on the shop floor with wallet/credit card in hand, you really are conscious of what you will pay for. Compared to when we design/visualise buildings some times, and are not as concerned with properly using the clients budget! :-) So.... jumping back from bicycles, and back to building specification and technology world once again, here is a quote from a Steel Systems Construction reference book:
So bear that in mind, with reference to the earlier talk about a cyclist transferring his/her energies, not into bending the frame of the bike, but into the action of cycling, and moving forward. Aluminium is currently the preferred material for cycling frames, due to its stiffness, unlike Steel which flexed a lot and was comfortable to ride therefore, but ultimately a lot of what you were working for, was just 'absorbed' by the actual frame of the bike.
Cheers for reading.
Brian.