Atir Strap And Beamd With Fix Crack _hot_ May 2026

Mastering Structural Repair: How to Use Atir Strap and Beam with Fix Crack Solutions

The Atir Strap and Beam system has been successfully applied in various construction projects, including:

Problem:

A 450 mm × 300 mm RCC beam showed a 2.5 mm wide vertical flexural crack at mid-span, extending 80% of beam depth. Atir Strap And Beamd With Fix Crack

[ A_s = \frac15 \times 10^60.87 \times 250 \times 300 = 230 \text mm^2 ] Mastering Structural Repair: How to Use Atir Strap

| Feature | Epoxy Injection | Carbon Fiber Wrap | ATIR Strap/Beam | |--------|----------------|-------------------|------------------| | Tensile strength recovery | Moderate | High | Very high | | Crack reopening prevention | Low | Moderate | High (rigid restraint) | | Ductility after repair | Low | Low to moderate | Moderate (steel yielding) | | Structural capacity increase | No | Yes (limited) | Yes (significant) | | Fire resistance | Poor | Poor | Good (steel protected by concrete cover) | | Ease of surface finishing | Good | Moderate | Good (flush mount) | Crack injected with epoxy resin

  1. Crack injected with epoxy resin.
  2. Two 60 mm × 6 mm hot-rolled Atir straps installed on beam bottom face, each spanning 1.2 m (600 mm beyond crack each side).
  3. M12 chemical anchors epoxy-grouted at 200 mm from crack ends.
  4. Straps pre-tensioned to 30 Nm torque.
  5. Painted with anti-corrosion coating.

Atir strap

For the purpose of this guide, we define the as a pre-galvanized or stainless steel flat bar with pre-punched holes, designed to resist tension forces. When a beam cracks, it loses its ability to handle tension on one side. The strap acts as an external tendon, carrying the tension load across the crack.

Using a high-pressure pneumatic pump, they injected a specialized structural polymer into the heart of the beam. The liquid surged into the void, filling every microscopic capillary of the break. Under the immense pressure of the Atir Straps, the polymer didn't just fill the gap—it fused with the old concrete, creating a bond stronger than the original pour.

Required strap area:

[ A_s = \fracM0.87 \times f_y \times d ] Where:

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