tag:blogger.com,1999:blog-6470543006314152962.post8692296430850253831..comments2024-03-11T16:49:27.614+00:00Comments on The Happy Pontist: French Bridges: 15. Pont d'Arcole, ParisThe Happy Pontisthttp://www.blogger.com/profile/15252272118786667592noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-6470543006314152962.post-91114026909181492892017-01-20T07:56:32.185+00:002017-01-20T07:56:32.185+00:00Thank you for sharing those details and historic b...Thank you for sharing those details and historic background to this underlooked bridge of Paris.<br /><br />Although, some archives (in French) give more details on the remedial works which happened after the 1888 incident.<br /><br />The additional trusses are actually two archs added to the central group of archs and bracing to the lateral archs have been modified as well. One can compare (and count) this photo from 1870s [1] and that view [2] (thank you Google).<br /><br />The double W bracing is a feature of the original steel bridge as can be seen on this photo [3] from the great Gustave Le Gray.<br /><br />Regarding the abutment anchorages, based on a 1888 conference speech by Gustave Eiffel [4] given a few weeks after the anchors ruptured, we learn that the top beams were originally connected to the abutments. The 1922 steel bridge course by Jean Résal given at Ecole des Ponts et Chaussées gives more background on this issue [5].<br />Hence, the bridge functionned both as an arch and a cantilever. Due to a great cold and after 30 some years, one of the anchors broke and the bridge sagged as it was then "only" an arch.<br /><br />1. http://prints.bl.uk/art/415760/the-pont-darcole-paris-c1870s<br />2. https://goo.gl/maps/vzYyVMTdxq72<br />3. http://gallica.bnf.fr/ark:/12148/btv1b8457759n<br />4. http://documents.irevues.inist.fr/bitstream/handle/2042/28780/C&T_1981_5_244.pdf;jsessionid=9668741573B14D6E5C5B923BA7212544?sequence=1<br />5. http://gallica.bnf.fr/ark:/12148/bpt6k91079b.pdfFrédéric Bourgeonhttps://www.blogger.com/profile/00052203024296734618noreply@blogger.com