Richard Greiner

Fatigue Tests for a Riveted Steel Railway Bridge in Salzburg

Evaluation and assessment of the fatigue resistance of riveted bridges are important, because a lot of these bridges, which were built in the beginning of the 20th century, are still in service. These bridges are subjected now to much higher loads than those originally designed for. In order to establish fatigue categories for different riveted connections there is a need towards building a complete data base of experimental results for riveted built up sections. This research discusses the experimental results of testing six stringers demolished from bridges dated 1903 and 1914. The program is composed of testing four built up stringers of two different cross sections in fatigue. Moreover, two stringers were tested in cyclic static tests to evaluate the rivet clamping force and slip initiation respectively.

Ein “Overall‐Konzept” für die Querschnittstragfähigkeit im elasto‐plastischen Bereich

Es wird die bereits fur andere Tragfahigkeitsprobleme von Bauteilen (Knicken, Beulen) entwickelte “Overall-Methode” auf die Berechnung der Querschnittstragfahigkeit von Stahlprofilen angewendet. Dies fuhrt zu einer neuen Berechnungsmethode, die den gesamten elasto-plastischen Bereich ohne die Notwendigkeit einer Klasseneinteilung umfasst. Basierend auf zahlreichen Versuchen und Querschnittsberechnungen mittels geometrisch, materiell nichtlinearer Analysen mit Imperfektionen werden (analog den Knicklinien) Bemessungskurven fur die Abminderungsfaktoren vorgeschlagen, die fur bestimmte Querschnittstypen wie I-beziehungsweise H-Profile oder Rechteck-Hohlprofile, einen einheitlichen Verlauf im elasto-plastischen Bereich aufweisen. An overall concept for the cross-section resistance in the elasto-plastic range. The “overall method” which has been developed for other load carrying problems of steel members (e.g. lateral member buckling or buckling of shells) is applied to the calculation of the cross-section resistance of steel members. This leads to a new procedure that covers the whole elasto-plastic range without the need of cross-section classification. Based on numerous experimental tests and numerical calculations (GMNIA) design curves for the reduction factors of I- and H-shaped sections and RHS-sections are proposed that show a consistent transition in the elasto-plastic range.