{"id":230,"date":"2018-09-17T14:18:31","date_gmt":"2018-09-17T14:18:31","guid":{"rendered":"https:\/\/website.prod.unilu.spikeseed.cloud\/fr\/news\/bridge-test-in-luxembourg-identify-potential-damage-at-early-stage\/"},"modified":"2018-09-17T14:18:31","modified_gmt":"2018-09-17T14:18:31","slug":"bridge-test-in-luxembourg-identify-potential-damage-at-early-stage","status":"publish","type":"news","link":"https:\/\/www.uni.lu\/fr\/news\/bridge-test-in-luxembourg-identify-potential-damage-at-early-stage\/","title":{"rendered":"Bridge test in Luxembourg: identify potential damage at early stage"},"content":{"rendered":"<section class=\"wp-block-unilux-blocks-free-section section\"><div class=\"container xl:max-w-screen-xl\"><p>The University of Luxembourg, in collaboration with the Administration des Ponts et Chauss\u00e9es, carried out a large test bridge on 13 September 2018 in Altrier, Luxembourg. By taking pictures along the bridge with drones and by applying the principles of photogrammetry, the researchers measured the deflection line of the bridge with high precision in order to allow in the future early damage detection by applying a new developed algorithm.<\/p><figure class=\"wp-block-dev4-reusable-blocks-image  object-fit--contain\">\n    \n<img decoding=\"async\" class=\"wp-block-image unilux-custom-image-block\"\n                alt=\"\"\n            src=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/11\/2023\/07\/dji_0981_2.jpg\"\n                    style=\"object-position: 50.00% 50.00%; font-family: &quot;object-fit: contain; object-position: 50.00% 50.00%;&quot;; aspect-ratio: 4\/3; object-fit: contain; width: 100%;\"\n        loading=\"lazy\"\n\/>    <\/figure><p>In the frame of a research project entitled \u201c<strong>Condition assessment of bridge structures by analytical and numerical methods<\/strong>\u201d, engineers of the Laboratory of Solid Structures from the Research Unit in Engineering Sciences (<a href=\"https:\/\/wwwen.uni.lu\/research\/fstc\/research_unit_in_engineering_sciences_rues\" target=\"_self\" title=\"\" rel=\"noopener\">RUES<\/a>) at the University of Luxembourg have developed an algorithm to better analyse the condition of bridge structures.<\/p><p>\u201cThe algorithm, which is able to identify damage based on the measurement of the <strong>deflection line under static load<\/strong>, showed very promising results, not only in theoretical examples but also in laboratory experiments. Thus, we decided to go further with an in situ load deflection experiment on a real bridge structure by using the<strong>\u00a0latest measurement techniques<\/strong> such as laser scanner and photogrammetry\u201d, explain Professor\u00a0Dani\u00e8le Waldmann and PhD student Dolgion Erdenebat who have been working on this project since Mai 2015.<\/p><figure class=\"wp-block-dev4-reusable-blocks-image  object-fit--contain\">\n    \n<img decoding=\"async\" class=\"wp-block-image unilux-custom-image-block\"\n                alt=\"\"\n            src=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/11\/2023\/07\/20180913_04938.jpg\"\n                    style=\"object-position: 50.00% 50.00%; font-family: &quot;object-fit: contain; object-position: 50.00% 50.00%;&quot;; aspect-ratio: 3\/2; object-fit: contain; width: 100%;\"\n        loading=\"lazy\"\n\/>    <\/figure><p>With the help of the <a href=\"http:\/\/pch.public.lu\/\" target=\"_blank\" title=\"\" rel=\"noopener\">Administration des Ponts et Chauss\u00e9es<\/a>, the research team selected the bridge in Altrier due to its configuration, access and space. PhD Erdenebat was really involved in this choice: \u201cFirst of all, we selected <strong>beam bridges<\/strong> instead of arch, truss, suspension or cable-stayed bridges because they have usually a continuous cross-section. Then, we took into account environmental conditions to facilitate the access of trucks, the flight of drones, the traffic flow and the workspace\u201d.<\/p><figure class=\"wp-block-dev4-reusable-blocks-image  object-fit--contain\">\n    \n<img decoding=\"async\" class=\"wp-block-image unilux-custom-image-block\"\n                alt=\"\"\n            src=\"https:\/\/www.uni.lu\/wp-content\/uploads\/sites\/11\/2023\/07\/img_8316.jpg\"\n                    style=\"object-position: 50.00% 50.00%; font-family: &quot;object-fit: contain; object-position: 50.00% 50.00%;&quot;; aspect-ratio: 21\/9; object-fit: contain; width: 100%;\"\n        loading=\"lazy\"\n\/>    <\/figure><p>After 8 hours of measurements divided in three steps: before loading, during loading and after loading, the experiment was a real success. The researchers were very satisfied with the results obtained: \u201cThese measurements enable us to include to our algorithm the impact of large-scale dimensions and environmental conditions\u201d, comments Prof. Waldmann.<\/p><p>Researchers will now continue to develop the method, based on the collected valuable information, and optimize the researched algorithm and measurement techniques as a contribution to the safe and economic preservation of our infrastructure.<\/p><p>The experiment was carried out by a team composed of technicians and researchers from the\u00a0<a href=\"https:\/\/wwwfr.uni.lu\/recherche\/fstc\/research_unit_in_engineering_sciences_rues\/research_areas\/institute_of_civil_and_environmental_engineering_inceen\" target=\"_self\" title=\"\" rel=\"noopener\">Institute of Civil and Environmental Engineering (INCEEN)<\/a>\u00a0and the\u00a0<a href=\"https:\/\/wwwen.uni.lu\/snt\" target=\"_self\" title=\"\" rel=\"noopener\">Interdisciplinary Centre for Security, Reliability and Trust (SnT)<\/a>.<\/p><p><\/p><\/div><\/section>","protected":false},"excerpt":{"rendered":"<p>The University of Luxembourg, in collaboration with the Administration des Ponts et Chauss\u00e9es, carried out a large test bridge on 13 September 2018 in Altrier, Luxembourg. By taking pictures along the bridge with drones and by applying the principles of photogrammetry, the researchers measured the deflection line of the bridge with high precision in order to allow in the future early damage detection by applying a new developed algorithm.<\/p>\n","protected":false},"author":0,"featured_media":0,"template":"","format":"standard","meta":{"featured_image_focal_point":[],"show_featured_caption":false,"ulux_newsletter_groups":"","uluxPostTitle":"","uluxPrePostTitle":"","_trash_the_other_posts":false,"_price":"","_stock":"","_tribe_ticket_header":"","_tribe_default_ticket_provider":"","_tribe_ticket_capacity":"0","_ticket_start_date":"","_ticket_end_date":"","_tribe_ticket_show_description":"","_tribe_ticket_show_not_going":false,"_tribe_ticket_use_global_stock":"","_tribe_ticket_global_stock_level":"","_global_stock_mode":"","_global_stock_cap":"","_tribe_rsvp_for_event":"","_tribe_ticket_going_count":"","_tribe_ticket_not_going_count":"","_tribe_tickets_list":"[]","_tribe_ticket_has_attendee_info_fields":false},"news-category":[4,3],"news-topic":[13],"organisation":[43,25,226],"authorship":[],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v22.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Bridge test in Luxembourg: identify potential damage at early stage - Universit\u00e9 du Luxembourg<\/title>\n<meta name=\"description\" content=\"The University of Luxembourg, in collaboration with the Administration des Ponts et Chauss\u00e9es, carried out a large test bridge on 13 September 2018 in Altrier, Luxembourg. 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