Cross-Plate Steel Seismic Damper for Large Displacement Isolation
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Solution Overview
Problem
Existing steel dampers for seismic isolation face challenges in manufacturing seismic isolation plates with the necessary deformability to absorb large relative displacements between structures and foundations during seismic events, due to limitations in steel sheet bending machines.
Innovation Solution
The steel damper for seismic isolation features four seismic isolation plates bent from long steel sheets, with upper and lower fixing parts, inclined parts, and connecting parts, arranged in a cross configuration without overlapping, allowing for enhanced deformability and energy absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the dimension of the inclined part is increased to approximately 400 mm to 600 mm to ensure deformability for large relative displacement, then the deformability is improved, but the bending depth exceeds the 700 mm limit of general steel sheet bending machines
Solution Approach 1:
The seismic isolation plate is divided into multiple parts: upper fixing part, lower fixing part, and inclined part. By segmenting the structure, the patent enables the inclined part to have sufficient length (400-600 mm) for deformability while the fixing parts provide stable attachment points, making the overall design manufacturable with standard equipment
Solution Approach 2:
The patent transitions from overlapping arrangement in a single plane to a spatial configuration where upper and lower fixing parts are positioned at different heights and locations. This dimensional change allows the inclined part to achieve the required 400-600 mm length for deformability without exceeding the 700 mm bending depth limit of standard machines
2Adaptability or versatility
If the dimension of the upper fixing part and lower fixing part is set to at least approximately 300 mm to follow large relative displacement, then the deformability is improved, but the bending depth requirement increases beyond the 700 mm limit of general steel sheet bending machines
Solution Approach 1:
The seismic isolation plate is divided into multiple parts: upper fixing part, lower fixing part, and inclined part. By segmenting the structure, the patent enables the inclined part to have sufficient length (400-600 mm) for deformability while the fixing parts provide stable attachment points, making the overall design manufacturable with standard equipment
Solution Approach 2:
The patent transitions from overlapping arrangement in a single plane to a spatial configuration where upper and lower fixing parts are positioned at different heights and locations. This dimensional change allows the inclined part to achieve the required 400-600 mm length for deformability without exceeding the 700 mm bending depth limit of standard machines
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 design enables the steel damper to effectively absorb the energy of seismic motion by providing the necessary deformability for large relative displacements, while preventing direct energy transmission to the structure, thus enhancing seismic safety.
Implementation Method 1
the seismic isolation damper absorbs the energy of seismic motion to prevent the energy of seismic motion from being directly transmitted to the structure
Data Source
AI summary
An upper board fixed to a lower part of a structure; a lower board fixed to a foundation at the same position in a plan view with respect to the upper board; and four seismic isolation plates fixed to the upper and lower boards and extending in a cross direction in a plan view. The seismic isolation plates are U-shaped members obtained by bending a long steel sheet, and include an upper fixing part parallel to a lower fixing part, an upper inclined part and a lower inclined part that are closer to each other while separated from the upper and lower fixing parts, and a connecting part that connects the upper and lower inclined parts. The four seismic isolation plates are fixed to upper board at position where upper fixing parts do not overlap and are fixed to lower board at position where lower fixing parts do not overlap.