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<p>Embedded cast-in dowel connections are among the most typically employed for floor-to-beam and beam-to-column joints of precast concrete structures. They can be smartly detailed with local confinement and supplementary reinforcement, which can dramatically improve the performance of the dowel connection under imposed lateral loads, especially for low concrete cover over bar diameter ratio. The joint shear strength can be relevantly increased with respect to both old and modern design formulations available in the technical and scientific literature, typically referring to joints with poor detailing where the brittle loss of frontal concrete cover is associated with collapse. Original tests are presented concerning both floor-to-beam and beam-to-column dowel joints provided with couplers and threaded bars with different local detailing, showing peculiar beneficial effects induced by the supplementary reinforcement and by the stiffening of the dowel bar by couplers. Advanced 3D finite element simulations based upon static non-linear analysis are employed to properly interpret the dowel mechanism of such well-detailed joints when subject to combined axial-bending-shear actions under imposed lateral displacement.</p>

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Tests and simulations of dowel joints with threaded bars and couplers for precast structures

  • 期刊论文

  • 发表日期：

    2026年7月17日

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  • Bruno Dal Lago,
  • Milot Muhaxheri

摘要

Embedded cast-in dowel connections are among the most typically employed for floor-to-beam and beam-to-column joints of precast concrete structures. They can be smartly detailed with local confinement and supplementary reinforcement, which can dramatically improve the performance of the dowel connection under imposed lateral loads, especially for low concrete cover over bar diameter ratio. The joint shear strength can be relevantly increased with respect to both old and modern design formulations available in the technical and scientific literature, typically referring to joints with poor detailing where the brittle loss of frontal concrete cover is associated with collapse. Original tests are presented concerning both floor-to-beam and beam-to-column dowel joints provided with couplers and threaded bars with different local detailing, showing peculiar beneficial effects induced by the supplementary reinforcement and by the stiffening of the dowel bar by couplers. Advanced 3D finite element simulations based upon static non-linear analysis are employed to properly interpret the dowel mechanism of such well-detailed joints when subject to combined axial-bending-shear actions under imposed lateral displacement.