Shear Experiments of Prestressed Concrete Bridge Girders

Delft University of Technology. is a member of ACI 445-0D Shear Databases, ACI-ASCE 421 Design of Reinforced Concrete Slabs, ACI 342 Evaluation of Concrete 10 Bridges and Bridge Elements, vice chair of ACI 445-0E Torsion, and an associate member of ACI 11 437 Strength Evaluation of Existing Concrete Structures, and ACI-ASCE 445 Shear and Torsion. ABSTRACT 11 For the assessment of existing slab-between-girder bridges, the shear capacity and failure mode are 12 under discussion. Previous research showed that the static and fatigue punching capacity of the 13 slabs is sufficient as a result of compressive membrane action. The girders then become the critical 14 elements. This research studies the shear capacity of prestressed concrete bridge girders. For this 15 purpose, four (half) girders were taken from an existing bridge that was scheduled for demolition 16 and replacement and tested to failure in the laboratory. Two loading positions were studied. The 17 results show that there should be a distinction between the mode of inclined cracking and the actual 18 failure mode. In addition, the results show that for prestressed concrete girders the influence of the 19 shear span to depth ratio should be considered for shear span to depth ratios larger than 2.5. These 20 insights can be used for the assessment of existing slab-between-girder bridges in the Netherlands.

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