Concave Sliding Seismic Isolator for Earthquake Vibration Absorption
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Solution Overview
Problem
Existing seismic isolation devices are inadequate in effectively absorbing vibrations during earthquakes, leading to potential structural damage and instability.
Innovation Solution
A seismic isolation device featuring a sliding platform with a downwardly concave sliding surface and a sliding body that uses a sliding means to absorb vibrations, including a sliding surface with a motion-limiting mechanism and auxiliary sliding bodies to prevent slipping and enhance vibration absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional seismic isolation device is used, then the structure is supported stably under normal conditions, but it cannot effectively absorb vibrations during earthquakes
Solution Approach 1:
The sliding surface is designed with a downwardly concave curved shape instead of a flat surface. This curvature enables the sliding body to move along an arc trajectory during earthquakes, enhancing vibration absorption through rotational motion while maintaining structural simplicity. The curved geometry transforms linear sliding into rotational sliding, improving seismic isolation performance without adding complex mechanical components.
Solution Approach 2:
The device transitions from a static support structure to a dynamic system where the sliding body can freely move along the curved sliding surface during earthquakes. This dynamic capability allows the structure to adapt to seismic vibrations in real-time, absorbing energy through controlled motion while maintaining stability during normal conditions when the sliding body remains stationary.
2Reliability
If the sliding body is allowed to slide freely on the sliding surface, then vibration absorption is improved, but the sliding body may slip off the sliding surface
Solution Approach 1:
The sliding surface includes retention edges that extend outward from the curved surface to prevent the sliding body from slipping off during seismic motion. These edges create a potential well effect, confining the sliding body within the curved surface boundaries while still allowing free movement along the curve for vibration absorption. The retention structure is designed in advance to counteract the centrifugal and gravitational forces that could cause slippage.
3Stability of the object's composition
If friction between the sliding body and sliding surface is increased to prevent slippage, then stability is improved, but vibration absorption capability is reduced
Solution Approach 1:
The sliding surface features localized high-friction regions at the retention edges where the sliding body makes contact during extreme motion, while the central curved sliding path maintains low friction for smooth vibration absorption. This spatial variation in friction characteristics allows the system to prevent slippage at boundaries while enabling free sliding in the operational zone, resolving the contradiction between retention and vibration absorption.
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 device effectively absorbs vibrations, reducing the transmission of seismic forces to structures and enhancing their stability and protection during earthquakes.
Implementation Method 1
a sliding body movably placed on the sliding surface, capable of sliding on the sliding surface by means of a sliding means, wherein the sliding body slides on the sliding surface and absorbs vibrations due to an earthquake
Implementation Method 2
a sliding platform having a sliding surface of a downwardly concave shape provided on an upper surface thereof
Data Source
AI summary
The present invention relates to a seismic isolation device, including: a sliding platform (100) having a sliding surface (120) of a downwardly concave spherical shape formed on an upper surface thereof; and a sliding body (200) placed on the sliding surface (120) being capable of sliding on the sliding surface (120) by means of a sliding means, wherein the sliding body (200) slides on the sliding surface (120) in a situation where an earthquake occurs to effectively absorb vibrations applied to a structure, such that the structure can be safely protected.