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12 R E L A S T ® D E S I G N M A N U A L RELAST ® 16 RELAST ® 22 Figure 8 Geometrical arrangement of the RELAST ® screws in the test beams [1] 3 1 RELAST ® as shear reinforcement To determine whether concrete screws can be used for the shear reinforcement of concrete elements three series of tests involving 32 test specimens were performed at the University of Innsbruck RELAST ® screws in different configurations were installed to these specimens with and without adhesive mortar from the top side of the beams or from below [1] The aim of these series was to 1 Prove the suitability of concrete screws as shear reinforcement elements 2 Determine the influence of screw size on strengthening performance 3 Determine the influence of installation depth on strengthening performance 4 Investigate the behavior of the concrete screws as shear reinforcement elements under dynamic loading The following image shows the different specimens under different geometrical arrangements The following image illustrates the test beam specimens which have a total length of 350 cm with a beam cross section of 22x32 cm The spacing between the supports is 250 cm The beams were all reinforced with 20 mm diameter bars four bars as bottom reinforcement and two bars as top Additionally 10 mm diameter stirrups were installed at the supports and between the load bearing points Accordingly 80 cm on both sides of the beam were available to investigate the behavior of concrete screws in various installation configurations [1] Figure 9 Test specimen for shear reinforcement [1] 3 VALIDATION BY TESTING