tag:blogger.com,1999:blog-6470543006314152962.post1252741082088700661..comments2024-03-11T16:49:27.614+00:00Comments on The Happy Pontist: Northumbrian Bridges: 4. Cragside BridgeThe Happy Pontisthttp://www.blogger.com/profile/15252272118786667592noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-6470543006314152962.post-60355242856560207492014-02-13T03:51:00.048+00:002014-02-13T03:51:00.048+00:00Thanks HP & Imre!
That makes sense now. And I...Thanks HP & Imre!<br /><br />That makes sense now. And I agree that it definitely would take away from the aesthetic of this bridge - although it works quite well on Menn's bridges!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6470543006314152962.post-53887346742126989552014-02-07T09:32:51.482+00:002014-02-07T09:32:51.482+00:00To visualize the kinked arch, you may google up Ch...To visualize the kinked arch, you may google up Christian Menn's Viamala bridge http://structurae.net/structures/data/index.cfm?id=s0021723 , or Cascella bridge http://structurae.net/structures/data/index.cfm?id=s0000171 or http://tripwow.tripadvisor.com/slideshow-photo/nanin-bridge-by-travelpod-member-swisshokies-rovio-switzerland.html?sid=13258902&fid=tp-10<br /><br />The photos there - especially those taken from skew angles - show the kinks where the vertical posts join the arch.<br />Imre Laufernoreply@blogger.comtag:blogger.com,1999:blog-6470543006314152962.post-40442103866207779792014-02-06T21:04:58.775+00:002014-02-06T21:04:58.775+00:00To first anonymous: "correct" geometry i...To first anonymous: "correct" geometry in this sense means one where the structural members carry only axial forces and no bending - this is the most efficient use of material, and it's how arches have worked since they were first invented.<br /><br />An arch subject to a uniform load over its whole length has very little bending in it. Concentrated loads, as at the points where the spandrel members join the arch ribs, create significant bending. Much of that bending can be eliminated by introducing kinks in the arch when viewed in elevation, so it would be a series of straight lines joining the various connection points, something like the outline of a fifty-pence piece (in UK money).<br /><br />This would have much less bending, and for the same amount of material, would be much stronger than the Cragside bridge.<br /><br />But it wouldn't look nearly as nice.The Happy Pontisthttps://www.blogger.com/profile/15252272118786667592noreply@blogger.comtag:blogger.com,1999:blog-6470543006314152962.post-77740753864868632432014-02-06T17:19:43.297+00:002014-02-06T17:19:43.297+00:00Very nice indeed. Also adding to the charm are the...Very nice indeed. Also adding to the charm are the (stone?) supports that have almost become part of the landscape with their weathered look.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-6470543006314152962.post-21309714636613476612014-02-06T09:40:24.258+00:002014-02-06T09:40:24.258+00:00Having trouble picturing what you mean by introduc...Having trouble picturing what you mean by introducing kinks to get the 'correct' geometry.. would you mind explaining it for me? :)Anonymousnoreply@blogger.com