INDUSTRY COMPONENT

Prestressing Tendons

High-strength steel tendons used to apply compressive stress in concrete bridge beams for enhanced load capacity and durability.

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Component Specifications

Definition
Prestressing tendons are high-tensile steel strands, wires, or bars embedded in concrete bridge beams to introduce permanent compressive stresses, counteracting tensile forces from loads. They are tensioned before or after concrete casting, transferring stress through anchorage systems to improve structural performance, reduce deflection, and prevent cracking under service conditions.
Working Principle
Tendons are tensioned using hydraulic jacks, inducing elastic elongation. This tension creates compressive forces in the concrete upon anchoring, balancing tensile stresses from external loads (e.g., traffic, dead weight). The principle relies on pre-compression to keep concrete in compression, enhancing stiffness and fatigue resistance.
Materials
High-carbon steel (e.g., ASTM A416, EN 10138), typically 7-wire strands with ultimate tensile strength of 1, 860-2, 000 MPa. Epoxy coating or galvanization may be applied for corrosion protection in aggressive environments.
Technical Parameters
  • Diameter 12.7-15.2 mm
  • Anchorage Type Wedge or button-head
  • Relaxation Class Low relaxation (2.5% max)
  • Tensile Strength 1,860 MPa
  • Modulus of Elasticity 195 GPa
Standards
ISO 6934-4, ASTM A416, EN 10138, DIN 1045

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Prestressing Tendons.

prestressing tendons bridge beam reinforcement post-tensioning steel concrete prestressing structural tendons high-strength strands bridge construction materials Prestressing Tendons in Other Transport Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Bridge Beam

A primary horizontal structural member that carries vertical loads and transfers them to bridge supports.

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Engineering Analysis

Risks & Mitigation
  • Corrosion leading to tendon failure
  • Anchorage slippage under cyclic loads
  • Grout voids in ducts causing stress concentrations
  • Over-tensioning causing concrete spalling
FMEA Triads
Trigger: Inadequate grout coverage in ducts
Failure: Localized corrosion and tendon fracture
Mitigation: Use vacuum grouting, inspect with ultrasonic testing, and specify non-porous duct materials.
Trigger: Fatigue from traffic-induced cyclic loading
Failure: Progressive strand breakage and loss of prestress
Mitigation: Design with fatigue-resistant steel, apply protective coatings, and monitor stress levels via sensors.

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±6% on jacking force, ±10 mm on tendon placement
Test Method
Tensile testing per ASTM A416, relaxation tests per ASTM E328, corrosion resistance per ASTM A1057

Buyer Feedback

★★★★☆ 4.7 / 5.0 (18 reviews)

"Impressive build quality. Especially the technical reliability is very stable during long-term operation."

"As a professional in the Other Transport Equipment Manufacturing sector, I confirm this Prestressing Tendons meets all ISO standards."

"Standard OEM quality for Other Transport Equipment Manufacturing applications. The Prestressing Tendons arrived with full certification."

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Frequently Asked Questions

What is the difference between pre-tensioning and post-tensioning tendons?

Pre-tensioning tendons are tensioned before concrete is cast, with stress transferred after curing. Post-tensioning tendons are tensioned after concrete hardening, using ducts and anchorage systems, allowing more flexibility in complex bridge designs.

How are prestressing tendons protected from corrosion?

Corrosion protection includes galvanizing, epoxy coating, grease injection, or sheathing (e.g., HDPE ducts). In post-tensioning, grout is often pumped into ducts to encase tendons, providing a alkaline environment that passivates steel.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

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