Michael Do¨hler, Falk Hille, Xuan-Binh Lam, Laurent Mevel and Werner Ru¨cker • The sensitivity computation of Jf j , Jdj and Jϕj depends on the sensitivities of the singular vectors of H. In [5], an efficient computation was derived, which is applied here. • Also in [5], the computation of ΣH was extended to the data driven UPC subspace matrix. 4 Modal Analysis of S101 Bridge during Progressive Damage Test Within the European research project “Integrated European Industrial Risk Reduction System (IRIS)” the prestressed concrete bridge S01 was artificially damaged [10]. The damaging processes were accompanied with a permanent measurement of the static and dynamic behavior of the structure. With that action a complete record of monitoring data during a defined loss of structural integrity on a typical bridge structure could be provided to test and evaluate SHM methods and applications. 4.1 The S101 Bridge The S101 was a prestressed concrete bridge from the early 1960th spanning over the 4-lane highway A1 in Austria. The structural system was a three-field frame with a 32 m wide mean field and two 12 m wide side fields. The superstructures cross section was designed as a 7.2 m wide post-tensioned double T-beam with varying heights (Figure 1). During recurring technical inspections of the bridge several deficiencies as cracks and spellings have been found. Since the crack pattern correlated with the geometric properties of the prestressing a significant deficit of structural reliability was assumed. Because of the subsequent determined limited load bearing capacity it was decided to replace the structure. Fig. 1 System drawing of bridge S101 [10]. 242
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