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NONLINEAR ANALYSIS OF A SKEW CONCRETE SLAB BRIDGE IN EASTERN AUSTRIA M. Wirnsberger , N. Randl , H. Wimmer Abstract In 2009 the Stooberbach Bridge, erected in 1963 in Burgenland in Eastern  Austria, has been strengthened by means of CFRP strips. The solid concrete slab bridge is skewed at an angle of 60 degrees and was originally designed for traffic  loads according to former Austrian Standards. A nonlinear FE-analysis of the  original bridge was been performed in order to detect whether the strengthening  could have been avoided. A key question in that context is the definition of an appropriate safety concept.  The safety assessment according to EN 1992-2 [1] and MC 2010 draft version [2] is based on a global safety factor independent from the failure mode whereas  another applied concept proposes safety factors depending on the material  failure mode. The material laws were introduced on the basis of EN 1992-1-1 [3]  and the traffic load applied according to EN 1991-2 [4]. The study revealed that  considering the redistribution of internal forces leads to a significant increase of  the calculated ultimate load bearing capacity of the former bridge.