Glass fibre reinforced polymer (GFRP) beams and columns can be connected via bonding, bolting or hybrid (combination of bolting and bonding) methods, with the use of additional connecting elements like cleats, cuffs, plates, or sleeves. These additional connecting elements can be materialised with GFRP or steel. The use of GFRP connecting elements results in the premature failure of these elements, while using steel elements transfers failure to the beams and/or columns. In this study, GFRP box columns and double channel beams are connected directly using stainless steel threaded rods without any additional connecting elements. First, monotonic tests were performed for specimens with bolted, bonded, and hybrid connections. These results showed that hybrid connections have the best performance in terms of stiffness and strength, with the bonded specimens presenting comparable stiffness, while the bolted specimens presented comparable strength. Considering the monotonic performance together with ease of construction and demountability requirements, the bolted connections were selected for the hysteretic tests under reverse cyclic (beams are loaded in opposite directions) loading. Moment-rotation behaviour, failure pattern, and dissipated energy were assessed.

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Seismic Behaviour of GFRP Interior Beam-to-Column Direct Connections Under Monotonic and Reverse Cyclic Loading

  • Ajith Mathew,
  • Yashida Nadir,
  • Jose Gonilha,
  • Anuja Raj

摘要

Glass fibre reinforced polymer (GFRP) beams and columns can be connected via bonding, bolting or hybrid (combination of bolting and bonding) methods, with the use of additional connecting elements like cleats, cuffs, plates, or sleeves. These additional connecting elements can be materialised with GFRP or steel. The use of GFRP connecting elements results in the premature failure of these elements, while using steel elements transfers failure to the beams and/or columns. In this study, GFRP box columns and double channel beams are connected directly using stainless steel threaded rods without any additional connecting elements. First, monotonic tests were performed for specimens with bolted, bonded, and hybrid connections. These results showed that hybrid connections have the best performance in terms of stiffness and strength, with the bonded specimens presenting comparable stiffness, while the bolted specimens presented comparable strength. Considering the monotonic performance together with ease of construction and demountability requirements, the bolted connections were selected for the hysteretic tests under reverse cyclic (beams are loaded in opposite directions) loading. Moment-rotation behaviour, failure pattern, and dissipated energy were assessed.