{"id":3900,"date":"2021-02-14T07:27:14","date_gmt":"2021-02-14T07:27:14","guid":{"rendered":"http:\/\/141.23.68.248\/wp\/?page_id=3900"},"modified":"2021-02-21T14:14:05","modified_gmt":"2021-02-21T14:14:05","slug":"steel-railway-truss-bridge","status":"publish","type":"page","link":"http:\/\/141.23.68.248\/wp\/?page_id=3900","title":{"rendered":"Steel railway truss bridge"},"content":{"rendered":"<p>This railway bridge is located over the Kaiser Wilhelm channel, in the railway branch that connects St. Michaelisdonn and Wilster. It has a length of 240 meters, and its superstructure, the truss, is made of steel while the piers are made of precast concrete. The bridge is shown in the picture below:<\/p>\n<p><a href=\"http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/bridge2.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5085\" src=\"http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/bridge2.jpg\" alt=\"bridge2\" width=\"491\" height=\"384\" srcset=\"http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/bridge2.jpg 491w, http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/bridge2-300x235.jpg 300w\" sizes=\"auto, (max-width: 491px) 100vw, 491px\" \/><\/a><\/p>\n<p><span style=\"text-decoration: underline;\">Geometry<\/span><br \/>\nThe subsystem of the piers and piles cap of the bridge was chosen as a subsystem to study their life cycle analysis. They consisted of a precast concrete frame; cylindrical piers and rectangular piers cap. The pile&#8217;s cap, rectangular-shape, is made of cast-in-place concrete. The piles are not included in the scope.<\/p>\n<p>A rough sketch of the subsystem is presented below:<\/p>\n<p><a href=\"http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/subsystem-sketch.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5091\" src=\"http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/subsystem-sketch.png\" alt=\"subsystem-sketch\" width=\"498\" height=\"533\" srcset=\"http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/subsystem-sketch.png 498w, http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/subsystem-sketch-280x300.png 280w\" sizes=\"auto, (max-width: 498px) 100vw, 498px\" \/><\/a><\/p>\n<p><span style=\"text-decoration: underline;\">Material characteristics<\/span><\/p>\n<p>Reinforced, cast-in-place concrete:<\/p>\n<ul>\n<li>Compression strength: 25 Mpa<\/li>\n<li>Raw materials components: cement, fly ash, coarse aggregates, fine aggregates, reinforcement<\/li>\n<\/ul>\n<p>Precast concrete:<\/p>\n<ul>\n<li>Compression strength: 50 Mpa<\/li>\n<li>Raw materials components: cement, coarse aggregates, fine aggregates, reinforcement<\/li>\n<\/ul>\n<p><span style=\"text-decoration: underline;\">Maintenance interventions<\/span><\/p>\n<p>The expected lifetime of the bridge is 100 years. During that period, regular maintenance actions must be carried out over the subsystem. These actions are:<\/p>\n<ol>\n<li>Maintenance in piers and piles cap<br \/>\nDescription: repair of cracks and carbonation and chloride process deterioration effect, in the concrete interface and in the appearance of the steel rebars corrosion.<br \/>\nIntervals: every 10 years<br \/>\nDuration: 10 days<\/li>\n<li>Repairs in piles cap due to scour<br \/>\nDescription: repair or eventually partial replacement of piles cap due to the soil erosion around the foundation, which can lead to piers collapse.<br \/>\nIntervals: every 50 years<br \/>\nDuration: 20 days<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<p>The timeline below shows the interventions along the system lifetime:<br \/>\n<a href=\"http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/interventions-timeline.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5104\" src=\"http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/interventions-timeline.png\" alt=\"interventions-timeline\" width=\"569\" height=\"177\" srcset=\"http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/interventions-timeline.png 569w, http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/interventions-timeline-300x93.png 300w, http:\/\/141.23.68.248\/wp\/wp-content\/uploads\/2021\/02\/interventions-timeline-520x162.png 520w\" sizes=\"auto, (max-width: 569px) 100vw, 569px\" \/><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This railway bridge is located over the Kaiser Wilhelm channel, in the railway branch that connects St. Michaelisdonn and Wilster. It has a length of 240 meters, and its superstructure, the truss, is made of<a class=\"read-more\" href=\"http:\/\/141.23.68.248\/wp\/?page_id=3900\">Continue reading<\/a><\/p>\n","protected":false},"author":82,"featured_media":0,"parent":3891,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"class_list":["post-3900","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"http:\/\/141.23.68.248\/wp\/index.php?rest_route=\/wp\/v2\/pages\/3900","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/141.23.68.248\/wp\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/141.23.68.248\/wp\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/141.23.68.248\/wp\/index.php?rest_route=\/wp\/v2\/users\/82"}],"replies":[{"embeddable":true,"href":"http:\/\/141.23.68.248\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3900"}],"version-history":[{"count":4,"href":"http:\/\/141.23.68.248\/wp\/index.php?rest_route=\/wp\/v2\/pages\/3900\/revisions"}],"predecessor-version":[{"id":5267,"href":"http:\/\/141.23.68.248\/wp\/index.php?rest_route=\/wp\/v2\/pages\/3900\/revisions\/5267"}],"up":[{"embeddable":true,"href":"http:\/\/141.23.68.248\/wp\/index.php?rest_route=\/wp\/v2\/pages\/3891"}],"wp:attachment":[{"href":"http:\/\/141.23.68.248\/wp\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3900"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}