Dimensjonering av gangbru

Abstract

NORSK: Oppgaven går ut på å dimensjonere en gangbru over riksvei 7 på Hardangervidda. Og se spesielt på dimensjonering av fagverk, avstivning, tverrspent dekke, tekniske løsninger, miljø og økonomi. Resultatene bygger på metoder beskrevet i Håndbok 185, Eurokode 1(laster), Eurokode 3(stål) og Eurokode 5(tre). Det har blitt benyttet Focus Konstruksjon 2010 til å beregne krefter som virker på fagverket og Autodesk Robot Structural Analysis Professional 2013 til å analysere det tverrspente dekket. Dimensjoneringen er basert på manuelle beregninger og excel regneark.

ENGELSK: The objective of this report is to compare the difference between steel versus wood as the construction material in a footbridge. The calculations are based on Eurocode 1(loads), Eurocode 3 (steel), Eurocode 5 (wood). The rules laid in Håndbok 185 by the Bureau of Norwegian Highway construction. (Statens vegvesen). The report is limited to trusses, stress laminated deck, and stiffening of the top chord of the bridge. Topics that are weighted in this report are economy, environment, technical solutions and the difference between trusses in steel and wood. Total length of the bridge is 50,172 m. The bridge consist of two spans, the longest being 28,5 m. The longest span hangs over the road RV7, in Hardangervidda. Deck width is 2,0 m and the stress laminated deck is design for the horizontal forces and stiffening of the bridge. This report shows that wood is more friendly to the environmental, this is mainly because wood is a renewable source. However, steel is proved as the best choice when economy is taken to account. Special technical solutions in the steel or wood trusses are not taken to account.