Zu Stahl-Verbundbrücken mit integralen Widerlagern

  • On composite bridges with integral abutments

Pak, Daniel; Feldmann, Markus (Thesis advisor)

Aachen : Shaker (2012, 2013)
Dissertation / PhD Thesis

In: Schriftenreihe des Lehrstuhls für Stahlbau und Leichtmetallbau der RWTH Aachen 74
Page(s)/Article-Nr.: IV, 152, XXX S. : Ill., graph. Darst.

Zugl.: Aachen, Techn. Hochsch., Diss., 2012

Abstract

In general, DIN Fachbericht 101 (Actions on bridges) and DIN Fachbericht 104 (Composite bridge structures) give design rules for the design of composite bridges. However, regarding the design procedure for composite bridges with integral abutments, a lack of rules and specifications especially regarding the soil-structure interaction is apparent. Although several state of the art approaches are known and available, a consistent procedure for the treatment of active and passive earth pressure is not given. Furthermore the sensitivity of design (based on different bridge configurations) to varying soil parameters has not been clarified in a comprehensive way. First of all this thesis summarizes present design standards and procedures as well as additional state of the art concepts regarding soil-structure interaction. On the one hand, a method for the determination and consideration of earth pressure loads caused by backfill is presented. Here temperature induced variations of the superstructure’s length as well as embankment surcharges caused by traffic loading are considered. This method is evaluatively integrated in the safety concept of DIN EN 1990. On the other hand, an approach for the consideration of horizontal as well as vertical foundation pile beddings is summarized. Based on this, a concept for the separation of superstructure and sub-structure is derived to allow for comprehensive parametric studies regarding the influence of different soil parameters on the design of the bridge structure. This concept is implemented into a stand-alone software tool and validated. For the consideration of non-symmetric loads on symmetric systems, a load correction factor is established. Parametric studies on single span bridges are performed and evaluated by means of the software tool. These studies allow for the identification of the influence of parameters such as different coefficients of subgrade reaction, superstructure stiffnesses and superstructure restraints on the design of the structure. Low cycle fatigue design of steel foundation piles is goverend as well, which might become decisive for the design of long bridges. A method is proposed allowing for the determination of strain reversals disregarding the actual load history. This concept is validated by means of low cycle fatigue tests. Furthermore an adequate temperature load spectrum for fatigue design is proposed.

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