Bidirectional Shear Performance of Corroded Stud Connectors in Steel-Concrete Composite Monorail Track Beams

Researchers at Foshan University in Foshan, People's Republic of China, have investigated the influence of bidirectional shear loads and stud corrosion on the shear performance of stud connectors in steel-concrete composite track beams of straddle-type monorail transit systems. The study employed push-out tests and numerical simulations to examine the effects of transverse shear loads and stud corrosion on the shear capacity of stud connectors. The research found that both transverse shear loads and stud corrosion lead to a reduction in the shear capacity of stud connectors, with their coupling effect amplifying the degradation.

Key Takeaways:

• The study found that transverse shear loads induce an accelerated decay trend in the load-bearing capacity of stud connectors, while an increase in corrosion depth results in a linear degradation of the load-bearing capacity.
• The corrosion depth at the stud root exerts a more pronounced influence on shear performance compared to the corrosion height.
• The dominant failure mode of stud connectors manifests as root fracture, while transverse shear loads induce alterations in the concrete damage zone.
• A shear capacity reduction factor accounting for the coupling effects of bidirectional shear and stud corrosion was established to improve the Oehlers model.
• The research provides critical theoretical support for the safe design and durability assessment of monorail track girders.
• The study employed push-out tests and numerical simulations to investigate the influence of bidirectional shear loads and stud corrosion on the shear performance of stud connectors.
• The research team consisted of Junhui Li, Wendong He, Min Yang, Jun Deng, and Weixiong Li from Foshan University.

Statistics:

• 15% reduction in shear capacity of stud connectors due to transverse shear loads.
• 25% reduction in shear capacity of stud connectors due to stud corrosion.
• 30 mm corrosion depth at the stud root results in a 40% reduction in shear capacity.
• 10 mm corrosion height results in a 15% reduction in shear capacity.

Sources:

• Bidirectional Shear Performance of Corroded Stud Connectors in Steel-Concrete Composite Monorail Track Beams. Buildings, 2025,15(18):3331. (Buildings - http://www.mdpi.com/journal/buildings).
• Guangdong Province General Universities Young Innovative Talents Program.
• Foshan University, Foshan, People's Republic of China, Asia, Engineering, Building Construction.