Using Pultruded Grating for Walkways and Fiberglass Sucker Rods

One of the most heavily used forests in the south is the Daniel Boone National Forest in Bath County in Kentucky, which receives more than 5 million visitors per year. A high-tech link to a key hiking trail in the county has been unknowingly used by visitors for more than 20 years.

Hybrid Fiber Reinforced Composite Pedestrian Bridge

Connecting the Clear Creek Furnace Picnic Area with the Sheltower Trace Trail is the 60’clear span bridge, which was the first hybrid fiber reinforced composite I-girder bridge. A Strongwell-pultruded FRP hybrid composite I-beam (24" x 7-½" x ¾") provides the main load carrying members.

Bending stiffness is substantially increased with the addition of carbon fibers to the I-beam flanges. With the addition of carbon fibers, the modulus of elasticity is increased to 6.0 x 106 psi, compared to 2.8 x 106 psi if the FRP beam is used without the fibers.

Hybrid Fiber Reinforced Composite Pedestrian Bridge

Technical Details

Strongwell-Chatfield supplied the pultruded grating, which was used for the walkway and fiberglass sucker rods. The sucker rods were produced at Strongwell-Bristol and they were anchored to the abutment for post tensioning. The design of the bridge is in conformance with AASHTO “Standard Specifications of Pedestrian Bridges,” with allowable deflection of L/180 (4 inches over 60 feet) at live loads of 85 psf.

Technical Data
Product Hybrid Fiber Reinforced Composite Pedestrian Bridge
Process Pultrusion, Fiberglass Fabrication
Materials Carbon and fiberglass reinforced vinyl ester (carbon fibers in top and bottom flanges of the beam)
Sizes Total Bridge: 6 ft. wide by 60 ft. long
Hybrid Support Beams: 24” x 7-½” x ¾”
For Cave Run Lake, Daniel Boone National Forest

pultruded grating


The work was sponsored by the Department of Defense, Advanced Research Projects Agency (ARPA) for the Technology Reinvestment Project to demonstrate the application of high volume/low cost production of high performance composite material structures in the infrastructure sector.

bridge component

Under the direction of Dr. Issam Harik, researchers at the University of Kentucky achieved the complete design, fabrication, and testing of the bridge and its components. The analysis, design, and construction techniques of the composite components were undertaken by the Great Lakes Composites Consortium, Wisconsin, and Basic Industry Research Laboratory (BIRL) at Northwestern University, Illinois.

This information has been sourced, reviewed and adapted from materials provided by Strongwell Corporation.

For more information on this source, please visit Strongwell Corporation.


Please use one of the following formats to cite this article in your essay, paper or report:

  • APA

    Strongwell Corporation. (2020, November 10). Using Pultruded Grating for Walkways and Fiberglass Sucker Rods. AZoM. Retrieved on July 14, 2024 from

  • MLA

    Strongwell Corporation. "Using Pultruded Grating for Walkways and Fiberglass Sucker Rods". AZoM. 14 July 2024. <>.

  • Chicago

    Strongwell Corporation. "Using Pultruded Grating for Walkways and Fiberglass Sucker Rods". AZoM. (accessed July 14, 2024).

  • Harvard

    Strongwell Corporation. 2020. Using Pultruded Grating for Walkways and Fiberglass Sucker Rods. AZoM, viewed 14 July 2024,

Ask A Question

Do you have a question you'd like to ask regarding this article?

Leave your feedback
Your comment type

While we only use edited and approved content for Azthena answers, it may on occasions provide incorrect responses. Please confirm any data provided with the related suppliers or authors. We do not provide medical advice, if you search for medical information you must always consult a medical professional before acting on any information provided.

Your questions, but not your email details will be shared with OpenAI and retained for 30 days in accordance with their privacy principles.

Please do not ask questions that use sensitive or confidential information.

Read the full Terms & Conditions.