Releasable Vibration Isolation Support for Seismic Pipe Stress Control
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Solution Overview
Problem
Existing vibration isolation structures for nuclear reactor buildings struggle to effectively prevent both high-frequency and low-frequency vibrations generated by aircraft collisions and earthquakes, leading to increased costs and complexity due to the need for separate structures.
Innovation Solution
A vibration isolation supporting structure with supporting portions near the wall and a fixing device that releases the supporting structure from the floor during high-frequency vibrations, allowing it to move with the building during low-frequency vibrations, thereby reducing relative displacement and stress on equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a viscoelastic member is used to prevent rotational displacement of the floor beam end, then high-frequency vibration is attenuated quickly, but the floor becomes seismically isolated in the horizontal direction causing large stress in pipes during earthquakes
Solution Approach 1:
The invention uses a releasable fixing device that can dynamically change the connection state between the supporting structure and the floor. During normal conditions, the fixing device maintains a fixed state to prevent high-frequency vibration. During earthquakes, the fixing device releases to allow relative movement, preventing large stress in pipes while still providing seismic isolation benefits.
2Object-affected harmful factors
If a heavy impactor is used to absorb vibration energy during aircraft collision, then high-frequency vibration is prevented, but the structure becomes large and cost increases
Solution Approach 1:
The invention divides the vibration protection function into two separate systems: a fixed supporting structure with releasable fixing devices for high-frequency vibration from aircraft collision, and the building's existing seismic isolation system for low-frequency earthquake vibrations. This segmentation allows each system to be optimized independently, avoiding the need for a single large complex structure.
Solution Approach 2:
The releasable fixing device operates in a periodic manner, being fixed during normal conditions to prevent high-frequency vibration, and releasing during earthquakes to allow movement. This periodic action allows the same structure to address both high-frequency and low-frequency vibrations without requiring a heavy impactor.
3Object-affected harmful factors
If separate vibration isolation structures are used for high-frequency and low-frequency vibrations, then both vibrations can be prevented, but the device complexity and cost increase
Solution Approach 1:
The invention merges the high-frequency vibration protection function into the existing supporting structure by adding releasable fixing devices. This allows the same supporting structure to provide both high-frequency vibration prevention (when fixed) and low-frequency vibration protection (when released), eliminating the need for separate structures.
Solution Approach 2:
The supporting structure with releasable fixing devices serves multiple functions: it provides high-frequency vibration isolation when fixed, and low-frequency seismic isolation when released. This multi-functionality eliminates the need for separate specialized structures for each vibration type.
Data Source
AI summary
A vibration isolation supporting structure and a vibration isolation system that can prevent a high-frequency vibration and a low-frequency vibration generated on a floor of a building. The vibration isolation supporting structure includes a plurality of supporting portions erected facing each other in a predetermined area near a wall of a floor of a building, a supporting structure supported on the floor by the supporting portions, and a fixing device configured to fix the supporting structure to the floor, and when receiving a release command, the fixing device releases fixing of the supporting structure to the floor.