Guardrail Post Anchoring System With Plastic Deformation Coupling
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Solution Overview
Problem
Existing anchoring systems for guardrail posts in civil engineering structures, such as bridges or dikes, face challenges in limiting the forces transmitted to the rigid support during impacts, which can lead to damage and difficulty in preserving the structure, while also risking vehicle overturning and incomplete decoupling that allows vehicles to pass through the guardrail.
Innovation Solution
An anchoring system for guardrail posts that includes a mechanical coupling between the post base and anchor plates, which deforms plastically under impact forces and breaks at specific threshold values, allowing total decoupling of the post from the anchor plate, thereby limiting forces transmitted to the rigid support and preventing further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the anchoring system uses a rigid coupling between the post base and anchor plate, then the structural strength is improved, but the force transmitted to the rigid support during impact increases excessively
Solution Approach 1:
The mechanical coupling transitions from a rigid static connection to a dynamic system that can rotate and deform under impact loads. The coupling includes a rotation axis and is designed to enter plastic deformation when the horizontal component of impact force generates a moment exceeding a first threshold value, allowing controlled energy dissipation while limiting forces transmitted to the rigid support.
Solution Approach 2:
The mechanical coupling's mechanical properties are designed to change under load conditions. The coupling enters plastic deformation at a first moment threshold and breaks by torsion at a second moment threshold, transforming the rigid connection into a controlled failure system that protects the rigid support from excessive forces.
2Force
If the mechanical coupling breaks by torsion at high impact forces, then the rigid support is protected from excessive forces, but the post base becomes totally decoupled from the anchor plate allowing vehicle passage
Solution Approach 1:
The anchoring system is segmented into distinct functional zones: the mechanical coupling that breaks by torsion to limit forces, and the anchoring means (anchor bolts) that remain intact to maintain post stability. This segmentation allows the coupling to fail controllably while preserving the overall anchoring system's ability to retain the post.
Solution Approach 2:
The mechanical coupling acts as an intermediary element between the post base and anchor plate. It is designed with fragile zones that break by torsion at a controlled second moment threshold, serving as a protective mediator that limits forces to the rigid support while the anchoring means maintain the post's retained position.
3Ease of manufacture
If the anchor plate uses through holes for anchor bolts, then the anchoring installation is simplified, but the anchor bolts are stressed in tension during impact increasing the risk of support damage
Solution Approach 1:
The mechanical coupling introduces dynamic rotation capability about a horizontal axis, transforming the static tensile loading on anchor bolts into a system where the coupling absorbs rotational energy through plastic deformation and torsional breakage, significantly reducing tensile forces transmitted to the anchor bolts and rigid support.
Solution Approach 2:
The system converts the harmful tensile forces that would damage the rigid support into beneficial plastic deformation and controlled torsional breakage of the mechanical coupling. The coupling's designed failure mode transforms potential support damage into controlled energy dissipation that protects the rigid support while maintaining anchoring effectiveness.
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 dissipates kinetic energy, reduces the risk of vehicle overturning, and allows for the reuse of anchoring components after an impact by ensuring complete decoupling and minimizing damage to the rigid support, while maintaining the structural integrity of the anchoring means.
Implementation Method 1
said mechanical coupling being a rigid coupling deformable in rotation under the action of a force F applied to the post having a horizontal component oriented from the front to the rear of the post, said mechanical coupling entering into plastic deformation when said horizontal component generates a moment of force M greater than a first threshold value S1 on the anchoring system
Implementation Method 2
said mechanical coupling is configured to break by torsion in fragile zones of the mechanical coupling when said horizontal component of the applied force generates a moment of force greater than a second threshold value S2 on the anchoring system
Data Source
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AI summary
Anchoring system for a guardrail post (1) in a rigid support (2), said post comprising a front face (1a) and a rear face (1b), said system comprising: - a post base (3); - an anchoring plate (4, 4a, 4b) to the rigid support (2); - anchoring means (8, 9, 10) of the anchoring plate (4, 4a, 4b) to the rigid support (2); in which said post base (3) is mechanically coupled to said anchoring plate (4, 4a, 4b) by a mechanical coupling, said mechanical coupling being a rigid coupling deformable in rotation under the action of a force F applied on the post (1) having a horizontal component oriented from the front to the rear of the post, said mechanical coupling entering into plastic deformation when said horizontal component generates a moment of force M greater than a first threshold value SI on the anchoring system.