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A new technique using steel wire ropes and Carbon Fiber Reinforced Polymer (CFRP) strips enhances masonry wall strength and ductility. This improved method increases out-of-plane load capacity and seismic performance, safeguarding structures.

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Engineering

Background:

  • Masonry walls often require strengthening to improve their load-bearing capacity and seismic resistance.
  • Existing techniques, like using stainless steel ribbons with CFRP strips, have shown promise but can be further optimized.

Purpose of the Study:

  • To introduce and evaluate an improved strengthening technique for masonry walls using steel wire ropes and CFRP strips.
  • To assess the impact of this new technique on the out-of-plane ultimate load, stiffness, and ductility of masonry walls.

Main Methods:

  • A novel strengthening technique was developed, replacing stainless steel ribbons with pre-tensioned steel wire ropes in conjunction with CFRP strips.
  • The technique creates a three-dimensional net of straps and utilizes an I-beam mechanism for load distribution.
  • Experimental testing was conducted to compare the performance of the new technique against existing methods.

Main Results:

  • The new technique significantly increases the out-of-plane ultimate load capacity compared to using CFRP strips alone.
  • Enhanced stiffness and delamination load were observed due to the greater stiffness of steel wire ropes.
  • Both the strength and ductility of the masonry walls were improved, with increased ultimate displacement.

Conclusions:

  • The improved technique effectively enhances masonry wall performance, offering greater strength and ductility.
  • The I-beam mechanism is particularly beneficial for resisting seismic forces like hammering action from floors.
  • The three-dimensional strap net provides a box-type behavior, crucial for preventing collapse and ensuring life safety during earthquakes.