{"id":4492,"date":"2016-07-15T15:08:14","date_gmt":"2016-07-15T19:08:14","guid":{"rendered":"https:\/\/engineering.jhu.edu\/magazine-archive\/?p=4492"},"modified":"2017-07-28T14:56:09","modified_gmt":"2017-07-28T18:56:09","slug":"modeling-truss-designs-yesteryear","status":"publish","type":"post","link":"https:\/\/engineering.jhu.edu\/magazine-archive\/2016\/07\/modeling-truss-designs-yesteryear\/","title":{"rendered":"Modeling Truss Designs of Yesteryear"},"content":{"rendered":"<p><b><a href=\"https:\/\/engineering.jhu.edu\/magazine-archive\/wp-content\/uploads\/2016\/06\/Claudio-Malicdem_JHU6163.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter size-large wp-image-8883\" src=\"https:\/\/engineering.jhu.edu\/magazine-archive\/wp-content\/uploads\/2016\/06\/Claudio-Malicdem_JHU6163-1024x682.jpg\" alt=\"Claudio Malicdem\" width=\"1024\" height=\"682\" srcset=\"https:\/\/engineering.jhu.edu\/magazine-archive\/wp-content\/uploads\/2016\/06\/Claudio-Malicdem_JHU6163-1024x682.jpg 1024w, https:\/\/engineering.jhu.edu\/magazine-archive\/wp-content\/uploads\/2016\/06\/Claudio-Malicdem_JHU6163-300x200.jpg 300w, https:\/\/engineering.jhu.edu\/magazine-archive\/wp-content\/uploads\/2016\/06\/Claudio-Malicdem_JHU6163-768x511.jpg 768w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/b><\/p>\n<p>Claudio Malicdem was born more than a century too late to work on constructing any of the approximately 10,000 covered wooden truss bridges that spanned waterways in America from the mid-1800s to the early 21st century.<\/p>\n<p>Yet over the last year, the 19-year-old civil engineering major has spent close to 500 hours working to replicate four of the most famous wooden truss bridge styles in miniature.<\/p>\n<p>\u201cBefore coming to Hopkins, I\u2019d never visited or seen a covered bridge in person,\u201d says Malicdem, as he tinkers with one of the models in a Latrobe Hall basement lab. \u201cOne thing I can say for sure is that I now have a new appreciation for the engineering involved.\u201d<\/p>\n<p>Malicdem is a member of a team of civil engineering students constructing the models under the supervision of <a href=\"http:\/\/engineering.jhu.edu\/civil\/faculty\/dr-rachel-sangree\/\">Rachel Sangree<\/a>, PhD &#8217;07, the Whiting School\u2019s resident expert on historic covered wooden truss bridges.<\/p>\n<p>Funded by a multiyear National Park Service grant, the project aims to create 3-D models to be used in civil engineering classes at Johns Hopkins, the University of Massachusetts Amherst, Virginia Tech, and several other schools. The models (and others based on them) will be used in a class Sangree co-teaches with Whiting School civil engineering professor <a href=\"http:\/\/engineering.jhu.edu\/civil\/faculty\/benjamin-schafer\/\">Benjamin Schafer<\/a>, Perspectives on the Evolution of Structures, which delves into, among other things, the important role that covered wooden truss<br \/>\nbridges played in the development of American engineering.<\/p>\n<p>\u201cThese models are important because you can touch, feel, sketch, and experience all that these small bridges have to offer. This interaction builds a foundation for intuition that expands one\u2019s thinking when working with the huge abstractions that long-span bridges and tall buildings require of civil engineers,\u201d says Schafer.<\/p>\n<p>Sangree explains that until the early 19th century, most long-span bridges necessitated the use of piers in the waterway to support the horizontal wood beams, which were simply laid parallel to each other to create a bridge structure. Those piers were vulnerable to ice and waterway debris, resulting in frequent damage and necessary replacement.<\/p>\n<p>To increase the resiliency of bridges and improve their economy, early architects, builders, and engineers sought ways to span long distances without the use of piers. One of the earliest truss bridge patents (1806) was for the Burr Truss, which, like earlier European forms, relied on traditional wooden joinery (requiring highly skilled labor) and arches\u2014which, like piers, were perilously close to the waterway, making them vulnerable to damage and decay.<\/p>\n<p>Ithiel Town cited these drawbacks when he patented his Town Lattice in 1820, which did away with arches and traditional joinery, but it used other inefficiencies in its design and was less aesthetically pleasing than traditional panelized trusses.<\/p>\n<p>Stephen Harriman Long followed the Town Lattice with his Long Truss in 1830 that used pre-stressing technology, allowing for long spans without the use of arches or traditional joinery. His model was improved upon by William Howe, who introduced iron as an integral part of his design in 1840, ushering in a new era\u2014that of the iron truss.<\/p>\n<p>\u201cIt is not an exaggeration to say that these covered wooden truss bridges signify the birth of structural engineering in America,\u201d says Sangree, who has studied them since 2002. \u201cThey represent the first period in American history when the architect\/builder\/engineer sought to innovate efficient, economic, and\u2014in the best cases\u2014elegant design solutions to a common problem: spanning a wide body of water.\u201d<\/p>\n<p>Christopher Marston, architect and project leader for the Historic American Engineering Record\u2019s National Covered Bridge Recording Project, agrees.<\/p>\n<p>\u201cIt is, of course, unrealistic for most engineering students to go out and work on an actual covered bridge project. So working with the models\u2014being able to see them and touch them\u2014shows them how connections worked on the four major truss types,\u201d he says.\u201cThe models will help them learn and appreciate the challenges and principles that engineers and builders in the early 19th century faced, and how they solved problems.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Claudio Malicdem was born more than a century too late to work on constructing any of the approximately 10,000 covered wooden truss bridges that spanned waterways in America from the mid-1800s to the early 21st century. Yet over the last year, he has spent close to 500 hours working to replicate four of the most famous wooden truss bridge styles in miniature.<\/p>\n","protected":false},"author":4,"featured_media":8879,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[25],"tags":[307,306,305,304,303,302,301],"class_list":["post-4492","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-students","tag-history-of-civil-engineering","tag-long-span-bridges","tag-covered-bridges","tag-wooden-truss-bridges","tag-national-park-service","tag-haer","tag-historic-american-engineering-records-national-covered-bridge-recording-project","issue-summer-2016"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Modeling Truss Designs of Yesteryear - JHU Engineering Magazine<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/engineering.jhu.edu\/magazine-archive\/2016\/07\/modeling-truss-designs-yesteryear\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Modeling Truss Designs of Yesteryear - JHU Engineering Magazine\" \/>\n<meta property=\"og:description\" content=\"Claudio Malicdem was born more than a century too late to work on constructing any of the approximately 10,000 covered wooden truss bridges that spanned waterways in America from the mid-1800s to the early 21st century. 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