Shear Friction Damper With Interchangeable Plates
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Solution Overview
Problem
Conventional shear friction dampers are costly to install and maintain, and their friction plates degrade quickly, making them ineffective for a wide range of external loads, as they are designed to operate with a constant friction force, which is not adaptable to varying magnitudes of external forces such as earthquakes or winds.
Innovation Solution
A high-performance shear friction damper with interchangeable friction plates of varying durability levels, allowing for easy maintenance and repair, and a design that enables sliding movement between support bodies and friction plates to convert vibration energy into frictional heat, effectively attenuating vibrations across different load magnitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If friction plates are designed with high friction durability, then the damper can withstand large external loads, but it cannot be driven by small external loads such as small scale earthquakes or wind vibrations
Solution Approach 1:
The damper employs multiple friction plates with different friction coefficients, allowing the system to dynamically adapt to varying external load magnitudes. Under small loads, plates with lower friction coefficients engage first, while under large loads, plates with higher friction coefficients become active, providing a progressive response to different earthquake intensities or wind forces
Solution Approach 2:
Each friction plate is designed with locally differentiated friction characteristics through varying material compositions or surface treatments. This allows different regions of the damper assembly to exhibit different friction behaviors, enabling the system to respond appropriately to a wide range of external forces from light vibrations to strong seismic events
2Adaptability or versatility
If friction plates are designed with low friction durability, then the damper can respond to small external loads, but it cannot properly attenuate vibration energy from large external loads such as large scale earthquakes
Solution Approach 1:
The progressive engagement of friction plates with increasing friction coefficients ensures that the damper remains responsive to small loads through low-friction plates while gaining the capability to handle large loads as higher-friction plates engage during stronger seismic events or wind forces
Solution Approach 2:
The friction plate assembly is segmented into multiple units with different friction characteristics, allowing the system to activate only the necessary portions based on the magnitude of external forces, thereby maintaining responsiveness to small loads while preserving the capacity to attenuate large load vibrations
3Device complexity
If conventional dampers are designed with fixed friction characteristics, then the structure is simple, but the maintenance and replacement costs increase when friction plates are abraded
Solution Approach 1:
The friction plates are designed as separable, modular components that can be independently removed and replaced without disassembling the entire damper structure. This segmentation allows maintenance personnel to access and replace worn friction plates easily, reducing maintenance costs while preserving the overall structural simplicity of the damper assembly
Solution Approach 2:
The friction plates are extracted as replaceable consumable components from the damper system, separating the wear-prone elements from the permanent structural components. This allows the friction plates to be replaced periodically while retaining the main damper structure, significantly reducing long-term maintenance and replacement costs
4Reliability
If conventional dampers require complete replacement when friction plates degrade, then the structural integrity is maintained, but the assembly costs and maintenance complexity increase
Solution Approach 1:
The damper is designed with modular friction plates that can be replaced individually while maintaining the integrity of the support bodies and connection structures. This segmentation allows partial replacement of degraded components without compromising overall structural reliability, while simplifying assembly and maintenance procedures
Solution Approach 2:
The friction plates are extracted as separate replaceable components, allowing them to be removed and replaced without disturbing the main structural elements. This ensures that structural integrity is maintained through proper reassembly of the permanent components, while reducing assembly complexity by allowing selective replacement of only the degraded friction plates
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 solution allows for efficient vibration attenuation across various external load magnitudes, reducing maintenance and repair costs by enabling easy replacement of friction plates and ensuring consistent performance through adaptable friction durability levels.
Implementation Method 1
The damper attenuates movement by a frictional force between two movable parts fixed between members of a construction structure
Data Source
AI summary
Disclosed is a high-performance shear friction damper provided in a building construction and attenuating a vibration which is applied to the building construction due to external loads such as an earthquake or strong wind. The high-performance shear friction damper includes first and second support bodies supported to a building construction or damping rods, two prop plates fixed to the second support body and extending to surround both side surfaces of the first support body, friction plates mounted between the first support body and the prop plates, and fastening units each including a tension bolt penetrating the first support body, the friction plates and the prop plates, and a nut fastened to an end of the tension bolt, wherein the first support body has slots extending in a horizontal direction, the tension bolts extend while penetrating the slots to allow the first support body to be slidably movable in the horizontal direction with respect to the friction plates.