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<p>This work aims to investigate the performance of single-headed and double-headed connectors installed in Ultra-High Performance Concrete (UHPC) under both monotonic and cyclic loading conditions. Both types of stud connectors are examined with and without rubber sleeves, considering various sleeve heights and thicknesses. A total of 20 finite element simulations are conducted with different configurations, including the thickness and height of the rubber sleeves, the type of load, and the stud head configuration. The cyclic analyses consist of 27 incremental load cycles followed by a monotonic push to failure, to evaluate damage and energy dissipation. Results show that rubber sleeves significantly reduce stress concentration at the stud root and improve ductility, with energy absorption increasing by up to 115% compared to bare studs. Double-headed studs further enhance stress distribution and anchorage at the highest absorbed energy (130,438&#xa0;N·mm) and stiffness (K₁ = 1483.63 × 10³ N/mm) observed in the test case with full-sleeve, double-headed configuration (Case-20). For monotonic load cases, the finite element analysis (FEA) results accurately predicted shear resistance within a 2% error for single-headed studs compared to available codes and case studies. However, for double-headed studs, the FEA results showed a difference of 8–12%, due to the existing codes are formulated for single-headed studs only. To address this, a modified shear resistance formula is proposed, incorporating a head correction factor (K<sub>i</sub>).</p>

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Performance of double-headed studs with rubber-sleeve arrangement under monotonic and cyclic loading

  • 期刊论文

  • 发表日期：

    2025年11月12日

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  • Md Saddam Hussain,
  • Shambhu Sharan Mishra

摘要

This work aims to investigate the performance of single-headed and double-headed connectors installed in Ultra-High Performance Concrete (UHPC) under both monotonic and cyclic loading conditions. Both types of stud connectors are examined with and without rubber sleeves, considering various sleeve heights and thicknesses. A total of 20 finite element simulations are conducted with different configurations, including the thickness and height of the rubber sleeves, the type of load, and the stud head configuration. The cyclic analyses consist of 27 incremental load cycles followed by a monotonic push to failure, to evaluate damage and energy dissipation. Results show that rubber sleeves significantly reduce stress concentration at the stud root and improve ductility, with energy absorption increasing by up to 115% compared to bare studs. Double-headed studs further enhance stress distribution and anchorage at the highest absorbed energy (130,438 N·mm) and stiffness (K₁ = 1483.63 × 10³ N/mm) observed in the test case with full-sleeve, double-headed configuration (Case-20). For monotonic load cases, the finite element analysis (FEA) results accurately predicted shear resistance within a 2% error for single-headed studs compared to available codes and case studies. However, for double-headed studs, the FEA results showed a difference of 8–12%, due to the existing codes are formulated for single-headed studs only. To address this, a modified shear resistance formula is proposed, incorporating a head correction factor (Ki).