FRP-Concrete Pole Assembly for Bending and Shear Loads
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Solution Overview
Problem
Current composite utility poles face challenges with increased bending moments and shear forces at extended heights, leading to lateral deflections and high costs or excessive weight, limiting their ability to support weight and withstand lateral forces effectively.
Innovation Solution
A pole assembly comprising an inner and outer shell made of fiberglass reinforced polymer (FRP) with a center fill layer of high-strength concrete or grout, optionally reinforced with steel wires, providing enhanced stiffness and load-carrying capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the length of composite poles is increased to extend utility lines, then the coverage area is improved, but the bending moments and shear forces increase greatly
Solution Approach 1:
The patent applies composite materials by combining FRP (fiberglass reinforced polymer) for the outer shell with concrete for the inner core, creating a hybrid structure that leverages the tensile strength of FRP and compressive strength of concrete to handle increased bending moments and shear forces at extended pole lengths
Solution Approach 2:
The patent uses a nested structure where the FRP shell encloses the concrete core, with the concrete fill material positioned inside the hollow cavity of the FRP pole section, creating a concentric composite structure that optimizes strength-to-weight ratio
2Strength
If the cross-section of composite poles is increased for strength and stiffness, then the load-bearing capacity is improved, but the cost increases significantly
Solution Approach 1:
The patent uses composite construction with FRP and concrete to achieve high strength and stiffness without proportionally increasing cost, as the combination provides superior mechanical properties compared to traditional single-material poles of equivalent or greater size
Solution Approach 2:
The patent changes the material parameters by using high-strength concrete (SSC concrete) and FRP composites, which have higher strength-to-weight and strength-to-cost ratios than traditional materials, allowing for more efficient cross-sectional designs
3Stability of the object's composition
If the cross-section of composite poles is increased for stiffness, then the lateral deflections are reduced, but the weight increases
Solution Approach 1:
The patent combines FRP and concrete in a nested configuration that optimizes stiffness-to-weight ratio, where the FRP shell provides tensile stiffness and the concrete core provides compressive stiffness, achieving high lateral rigidity without excessive weight gain
Solution Approach 2:
The nested FRP shell-concrete core structure creates an efficient distribution of material that maximizes moment of inertia and stiffness while minimizing weight, as the concrete core is enclosed within the FRP shell rather than adding external mass
Data Source
AI summary
The present invention provides an improved pole assembly. According to a first preferred embodiment, the present invention includes a first pole section which is formed by an inner shell wall surrounding a hollow inner cavity. According to a further preferred embodiment, the inner shell wall is formed as a first column of a given shape, which is formed of galvanized steel or fiberglass reinforced polymer, and which is surrounded by a center fill layer. The center fill layer is preferably formed of SSC concrete which surrounds the inner shell wall. According to a further preferred embodiment, the present invention preferably further includes an outer shell wall which is formed as a second column of a given shape, which surrounds the center fill layer.