Testing of Fibre Reinforced Concrete Structures: Shear Capacity of Beams with Openings
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This master thesis deals with the use of fibre reinforced concrete in load-carrying structures, with an emphasis on shear capacity of beams with openings. The main focus has been the design and testing of four full-scale beams. Two beams with plain concrete and conventional reinforcement and two beams with steel fibre reinforced concrete (SFRC), both with and without conventional reinforcement. The beams were tested until failure and then compared to each other in order to establish the effect of fibres. Theoretically calculated capacities have also been carried out according to current guidelines and compared to the test results. The properties of both the fresh and the hardened concrete were studied and tested in accordance with current standards and regulations. Self compacting SFRC with 1 vol-% steel fibres were used, which corresponds to about 80kg/m3. The idea was to simplify the reinforcement work, where the use of SFRC could serve as an adequate and cheaper alternative to the conventional shear reinforcement. A combination of both SFRC and conventional reinforcement would increase the total load-carrying capacity and at the same time lead to toughening and stiffening of the structure. The full-scale tests showed that by using 1 vol-% steel fibres the beam achieved the same capacity as the beams with conventional shear reinforcement. This suggests that SFRC is a promising alternative to conventional reinforcement. SFRC would simplify the reinforcement work, and ultimately lead to a reduction of man-hours involved in steel fixing.