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The I-beam shape is widely used in structural engineering due to its efficient load distribution. The geometry consists of:
A vertical web that resists shear forces
Horizontal flanges that carry bending stresses
In FRP I-beams, this geometry is optimized to maximize strength while minimizing material usage and overall weight. The result is a structural profile well suited for beams, joists, and primary load-bearing members in industrial structures.
FRP I-beams are manufactured using the pultrusion process, which produces continuous profiles with consistent cross-section and material properties.
Key structural features include:
Continuous longitudinal fiberglass for bending strength
Transverse mats for shear and impact resistance
Thermoset resin matrix for environmental durability
This engineered fiber architecture ensures predictable performance along the entire beam length and supports use in permanent structural installations.
FRP I-beams provide a balanced combination of strength, stiffness, and durability.
Typical performance characteristics include:
High strength-to-weight ratio
Excellent corrosion resistance
Electrical and thermal insulation
Stable mechanical behavior over time
While the elastic modulus of FRP is lower than steel, FRP I-beams are engineered to meet structural requirements when designed using appropriate deflection limits and safety factors.
Deflection control is a critical design consideration for FRP I-beams.
Unlike steel beams, FRP beams are usually governed by serviceability criteria rather than ultimate strength. Proper span selection and section sizing are essential to ensure acceptable deflection under design loads.
Common applications include:
Floor and platform beams
Pipe and equipment supports
Structural frames and bridges
When correctly sized, FRP I-beams provide stable and reliable performance across long spans with reduced dead load.
FRP I-beams are available in a range of standard depths, flange widths, and thicknesses to support common structural requirements.
Typical size ranges include:
Beam depth: 100 mm – 400+ mm
Flange width: 75 mm – 200 mm
Length: supplied in standard stock lengths or cut to size
For projects with specific load or space constraints, custom FRP I-beam profiles can be produced, including:
Increased flange thickness
Modified web dimensions
Special resin systems or surface finishes
Customization allows designers to achieve structural efficiency without over-specifying material.
For technical specifications and available profiles, visit our FRP I-Beam Product Page.
FRP I-beams are increasingly specified due to:
No corrosion or rust
Reduced maintenance requirements
Lightweight handling and faster installation
Long service life in harsh environments
These advantages make fiberglass beams suitable for chemical plants, wastewater facilities, marine structures, and outdoor industrial projects.
To see how FRP I-beams integrate into complete structural systems, visit our Official FRP Structural Solutions Page.
Yes. They are designed for primary and secondary structural applications.
They are lighter and corrosion resistant, with design governed by deflection criteria.
Yes. UV-resistant surface veils support long-term outdoor exposure.
No. Corrosion resistance is inherent to the material.
Yes. Custom profiles can be produced for specific projects.
Service life commonly exceeds 30–50 years depending on environment and design.
FRP I-beams combine efficient I-beam geometry with advanced composite materials to deliver reliable structural performance in demanding environments. With corrosion resistance, lightweight handling, and predictable long-term behavior, fiberglass beams provide strong value for industrial and infrastructure projects where steel faces durability limitations.
