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Being a critical scenario in extreme events such as blast attacks, the progressive collapse of structures is often examined through alternate load path approach. This study, ignoring the blast magnitude, conducted push-down tests on five substructures: four post-tensioned precast concrete (PC) specimens and one reinforced concrete (RC) specimen. All substructures were designed with comparable seismic resistance. The tested PC specimens comprised unbonded and bonded substructures (UPC and BPC), a bonded substructure with low effective prestress (BPCL), and an unbonded substructure with steel angles (UPCA). The findings indicated that PC specimens displayed weaker beam action, resulting in an average 15.8% reduction in the first peak load compared to RC (48.7 kN). In contrast, the post-tensioned strands markedly improved structural integrity, yielding a remarkable 89.8% increase in ultimate load resistance. Compared with UPC, BPC showed a stronger beam action but notably inferior ductility, while BPCL balanced the resistance and deformation well, demonstrating the highest load capacity among them. Additionally, the steel angles proved effective in enhancing overall performance throughout the entire loading history. On this concept, an improved hybrid joint (i.e., BPC with external steel angles) was recommended to improve the robustness against progressive collapse.

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Experimental Investigation of Unbonded and Bonded Post-tensioned Precast Concrete Frames Subject to a Penultimate Column Loss

  • 会议论文

  • 发表日期：

    2025年

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  • Hai-Rong Shi,
  • Chun-Lin Wang,
  • Jun Yu,
  • Shaoping Meng

摘要

Being a critical scenario in extreme events such as blast attacks, the progressive collapse of structures is often examined through alternate load path approach. This study, ignoring the blast magnitude, conducted push-down tests on five substructures: four post-tensioned precast concrete (PC) specimens and one reinforced concrete (RC) specimen. All substructures were designed with comparable seismic resistance. The tested PC specimens comprised unbonded and bonded substructures (UPC and BPC), a bonded substructure with low effective prestress (BPCL), and an unbonded substructure with steel angles (UPCA). The findings indicated that PC specimens displayed weaker beam action, resulting in an average 15.8% reduction in the first peak load compared to RC (48.7 kN). In contrast, the post-tensioned strands markedly improved structural integrity, yielding a remarkable 89.8% increase in ultimate load resistance. Compared with UPC, BPC showed a stronger beam action but notably inferior ductility, while BPCL balanced the resistance and deformation well, demonstrating the highest load capacity among them. Additionally, the steel angles proved effective in enhancing overall performance throughout the entire loading history. On this concept, an improved hybrid joint (i.e., BPC with external steel angles) was recommended to improve the robustness against progressive collapse.