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  Precast tunnel segment: experimental tests of longitudinal joints

  A recently completed research project at the Chair of Concrete Structures of the Technical University of Munich focused on the design of longitudinal joints of reinforced segmental linings, aiming to improve current design regulations. The results of the experimental program showed that the formulation of partial loading in Eurocode 2 for the ultimate limit state (ULS) is conservative for moderate and large eccentricities (e > d/6) in the joint and the limit state is initiated by spalling of the concrete cover. The observed crack width of the splitting cracks was not of primary importance in the service limit state (SLS). Additionally, the tests showed that the joint rotation (rotations of up to 30 mrad were measured) at the ULS significantly exceed Janßen’s formulation in many cases. The tests were conducted in a unique and innovative test setup consisting of a 1000to compression testing machine and two additional, custom-made horizontal bearings with hydraulic jacks. The jacks and the machine are real-time controlled and permit fine adjustment of the stress state. State of the art measurement equipment such as Digital Image Correlation was used.

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