Querkraftversuche an Spannbetonträgern mit carbontextilbewehrter Spritzmörtelverstärkung unter zyklischer Beanspruchung

Shear tests on prestressed concrete beams strengthened with carbon textile reinforced spray mortar under cyclic loading

Many highway bridges in Germany exhibit shear capacity deficits under static and cyclic loading. A lot of structures are expected to demand refurbishment and strengthening within the next years, especially due to the current condition of many older road bridges in Europe. Different strengthening methods with specific advantages and disadvantages have proven to be suitable for the shear strengthening of bridges. In order to investigate the effect of an additional spray mortar layer with carbon textile reinforcement on the webs on the shear capacity, two tests on prestressed concrete beams were carried out at the Institute of Structural Concrete at RWTH Aachen University. The results of the tests were compared with previous tests on two identical beams which were not strengthened. The tests have shown that the strengthening measure leads to a considerably higher shear resistance concerning cyclic loading as well as the remaining static shear capacity.