Cable Array Bridge Redistributes Loads via Tension
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Solution Overview
Problem
Conventional bridge structural systems require large, heavy components to support loads, leading to inefficiencies in material consumption and environmental impact, as they primarily focus on transferring loads directly to the ground without optimizing force distribution.
Innovation Solution
A bridge system utilizing a network of cables to redistribute forces through eccentric loads reintroduced at the bridge deck, creating a negative bending moment and allowing for a more efficient distribution of loads, which reduces the size and weight of structural components while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If large structural components are used to support dead loads and live loads, then the bridge can safely carry heavy vertical loads and mitigate wind, seismic, and other forces, but the bridge requires substantial material consumption and has heavy weight
Solution Approach 1:
The patent replaces conventional mechanical load-bearing systems (large beams and columns) with a cable-based tension system. Cables are tensioned to create upward forces that counteract gravitational loads on the bridge deck, substituting compression-based structural support with tension-based cable support. This allows the bridge to carry heavy loads while using significantly less material.
Solution Approach 2:
The patent changes the structural system from a rigid, compression-based framework to a flexible, tension-based cable network. By altering the fundamental mechanical parameters (from compression to tension, from rigid to flexible), the bridge achieves equivalent or superior load-bearing capacity with reduced material consumption. The cable tensions and geometric configurations are optimized to provide necessary structural performance.
2Strength
If large structural components are used to support the bridge weight, then the bridge can safely carry vehicles and people, but more than 75% of the bridge's mass is used to support the bridge's own weight rather than loads
Solution Approach 1:
The patent replaces the conventional mechanical system of large load-bearing components with a cable tension system. The cables are anchored and tensioned to create upward forces that directly support the bridge deck and its loads, eliminating the need for heavy beams and columns. This substitution dramatically reduces the bridge's self-weight while maintaining adequate strength to carry vehicles and pedestrians.
3Reliability
If conventional bridge systems are used, then structural integrity is maintained, but the construction process is time-consuming and requires extensive material resources
Solution Approach 1:
The patent divides the bridge structure into modular components: cable arrays, anchorages, tensioning mechanisms, and deck sections. These modular elements can be manufactured independently and assembled systematically, streamlining the construction process. The segmented cable arrays can be tensioned and secured in stages, allowing for efficient construction while maintaining structural integrity throughout the building process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach results in a more efficient and flexible structural system that reduces material usage and environmental impact, enabling the construction of lighter and more stable bridges with improved load balancing and reduced material costs.
Implementation Method 1
an array of upper, lower, and vertical cables... tensioned via a network of cables... Structural components of the bridge system transfer the forces through a fulcrum
Implementation Method 2
Reintroduction of such eccentric loads creates a negative bending moment across the deck span, thereby supporting loads on the bridge
Data Source
AI summary
A structural spanning system that may be embodied by a cable array bridge system, which typically includes a pair of inclined towers separated by a horizontal distance spanned by a bridge deck and oriented at an outward angle. On opposing ends of the central bridge deck, the towers, and/or columns are secured at a common fulcrum. The columns are similarly oriented at an angle relative to a horizontal plane between fulcrums. Upper cables between towers extend to the deck and create a perpendicular force vector where they connect and are tensioned across the shallow arch bridge deck. Lower cables extend between opposing inclined columns, with one or more stringer cables extending between the lower cables and the bridge deck. Securing the lower cables to the deck via the stringer cables stabilizes the deck in tension by a counterforce to the upper cables. As a result, the bridge deck experiences a balanced pre-stress of upper cable forces in tension through the network of cables.