Modular Cellular Fenders for Pier Collision Protection
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Solution Overview
Problem
Existing bridge pier protection systems, particularly those using timber piles, are inadequate for medium and high energy collisions, susceptible to marine borers, have short service lives, and pose environmental hazards due to chemically treated timber, while fiber-reinforced polymer piles do not provide sufficient protection against collisions.
Innovation Solution
A modular energy dissipation system comprising components with energy dissipation units featuring adjacent cells that absorb impact through progressive buckling and plastic deformation, allowing for controlled energy dissipation and easy replacement of damaged parts, suitable for low, medium, and high energy collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If timber piles are used for pier protection, then the system is simple and inexpensive to manufacture, but the protection is inadequate for medium and high energy collisions and the service life is short
Solution Approach 1:
The protection system is divided into multiple modular energy dissipation units, each containing cellular structures that can independently buckle and absorb energy. This segmentation allows the system to handle higher energy collisions while maintaining manufacturability through standardized modular components.
Solution Approach 2:
The invention uses composite material structures combining cellular configurations with energy dissipation mechanisms. The modular units incorporate cellular metal or polymer structures that provide enhanced energy absorption capacity compared to solid timber, while maintaining ease of manufacture through modular assembly.
2Ease of manufacture
If timber piles are used for pier protection, then the initial cost is low, but the service life is short due to susceptibility to marine borers and chemical treatment degradation
Solution Approach 1:
The invention changes the material parameters from traditional timber to alternative materials such as concrete, steel, or composite materials that are resistant to marine borers and chemical degradation. This extends the service life while maintaining cost-effectiveness through the modular design that simplifies installation and maintenance.
Solution Approach 2:
The modular energy dissipation units are designed as replaceable components with relatively simple construction. When damaged, individual modules can be replaced rather than replacing entire timber pile systems, reducing long-term costs despite the disposable nature of individual units after impact.
3Ease of operation
If timber piles are used for pier protection, then the system is easy to install, but environmental hazards arise from chemically treated timber leaching
Solution Approach 1:
The invention changes the material composition parameters to eliminate chemically treated timber, using instead untreated natural materials like concrete, steel, or naturally durable woods that do not require harmful chemical treatments. This eliminates chemical leaching while maintaining ease of installation through modular design.
4Object-generated harmful factors
If fiber-reinforced polymer piles are used for pier protection, then environmental hazards are reduced, but the protection against collisions is insufficient
Solution Approach 1:
The FRP piles are configured as modular energy dissipation units with cellular structures that can buckle and absorb energy progressively during collision. This segmentation enhances the collision protection capability of FRP material while maintaining its environmental benefits.
Solution Approach 2:
The invention introduces dynamic energy dissipation mechanisms into the FRP structure, allowing the material to deform and absorb energy during impact rather than behaving as a rigid structure. This enhances collision protection while maintaining the environmental safety of FRP material.
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
The system effectively manages collision forces, minimizing damage to both the bridge pier and vessels, provides durability with low life-cycle costs, and reduces environmental impact by using modular components that can be easily replaced and installed, ensuring continuous protection against vessel collisions.
Implementation Method 1
dissipate energy introduced from an external force through the progressive buckling of one or more of the modular components and the buckling of at least one cell wall
Implementation Method 2
dissipate energy introduced from an external force through the progressive buckling of one or more of the modular components and the buckling of at least one cell wall
Data Source
AI summary
A system is disclosed for protecting supporting structures, such as those of a bridge or other such marine supporting structure, from the force of an impact of a vehicle/vessel. Such a system includes a plurality of modular components arranged in series and configured to dissipate the energy of the force through the progressive buckling of one or more of the modular components. Each modular component contains an energy dissipation unit that includes a plurality of adjacent cells. The energy of the force is dissipated in the buckling of the walls of the cells of the energy dissipation units through the formation of one or more plastic hinges and/or volume reduction of the cells.