Abstract
Concrete edge failure of a single anchor in concrete is strongly dependent on the tensile performance of the concrete, which can be greatly improved by the addition of steel fibers. This study investigated the effect of steel fibers on the shear failure mode and edge breakout resistance of anchors installed in steel fiber-reinforced concrete (SFRC) with fiber volume percentages of 0.33, 0.67, and 1.00%. The anchor used in the study was 30 mm in diameter, with an edge distance of 75 mm and embedment depth of 240 mm. In addition to the anchor specimens, beam specimens were prepared to assess the relationship between the tensile performance of SFRC beams and the shear resistance of SFRC anchors. The ultimate flexural strength of the beam and the breakout shear resistance of the anchor increased almost linearly with increasing volume fractions of fiber. Therefore, based on the ACI 318 design equation, a term was proposed using the ultimate flexural strength of concrete instead of the compressive strength to determine the concrete breakout shear resistance of an anchor in the SFRC. The calculated shear resistance of anchors in both the plain concrete and SFRC were in good agreement with the measurements. In addition to the load capacity of the SFRC anchors, the energy absorption capacity showed a linear increase with that of the SFRC beam.
Highlights
Concrete anchors are commonly used to support structural members and equipment in civil and industrial structures, including power plants
The current design specifications are based on the compressive strength of concrete to determine the current design specifications are based on the compressive strength of concrete to determine the concrete concretebreakout breakoutresistance resistanceofofan ananchor
This study investigated the effect of steel fibers the tensile resistance of the concrete
Summary
Concrete anchors are commonly used to support structural members and equipment in civil and industrial structures, including power plants. Anchor systems are used to connect new structural members for strengthening and retrofitting existing structures [1]. Large-scale structural members, facilities, and equipment are connected using pre-installed cast-in-place (CIP). The failure of anchors installed in concrete is mainly dependent on the strength of the steel anchor and concrete. Concrete failure causes sudden destruction of an anchor system, which can directly affect the proper performance of structures and human safety. The evaluation of concrete fracture strength in the anchor system is essential for the stability and durability of a structure
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