Viscous Wall Damper for Outrigger Building Settlement
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Solution Overview
Problem
Existing outrigger building constructions face challenges with differential vertical movement between perimeter columns and the structural core due to long-term settling, leading to complex design requirements, fatigue issues in viscoelastic materials, and inadequate damping across a wide range of displacements for wind and earthquake loading.
Innovation Solution
A viscous wall damper system is introduced, featuring a high-viscosity fluid container and a vane portion that extends into and out of the container to accommodate permanent differential vertical deformations, providing instantaneous damping by shearing the fluid when the building core displaces relative to the perimeter columns, thus addressing compliance, fatigue, and stiffness issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If viscoelastic material is used in the damper to provide damping, then damping effect is achieved, but the material is subject to fatigue and tearing due to differential vertical movement between core and perimeter columns
Solution Approach 1:
The patent replaces the viscoelastic material-based mechanical damping system with a viscous fluid-based damping system. Instead of relying on the elastic deformation and hysteresis of viscoelastic materials that are prone to fatigue, the invention uses a viscous fluid contained within a chamber that is sheared by a moving vane. This substitution eliminates the material fatigue and tearing issues while maintaining the damping function through fluid viscosity.
Solution Approach 2:
The patent changes the fundamental parameter of the damping mechanism from viscoelastic deformation to viscous fluid shear. By transitioning from a solid material-based approach to a fluid-based approach, the system achieves damping through the viscosity of the fluid rather than through elastic hysteresis, thereby avoiding the fatigue problems associated with repeated loading of viscoelastic materials.
2Reliability
If the damper is designed for specific relative position between core and perimeter columns, then optimal damping performance is achieved, but the damper cannot accommodate long-term settling and differential movement
Solution Approach 1:
The patent introduces dynamic adaptability to the damper system through the movable vane mechanism. The vane can move freely within the viscous fluid chamber, allowing the damper to adapt to changes in the relative position between the core and perimeter columns. This dynamic configuration enables the damper to accommodate long-term settling while maintaining optimal damping performance, as the vane adjusts its position based on the current structural conditions.
Solution Approach 2:
The viscous fluid acts as an intermediary medium between the vane and the chamber walls. This fluid intermediary allows for smooth, frictionless movement of the vane while providing the necessary damping force. The fluid mediates between the structural movements and the damping mechanism, enabling the system to accommodate differential settlement without compromising the damping function.
3Reliability
If regular maintenance is required for the damper system, then reliability can be maintained, but productivity and operational continuity are reduced
Solution Approach 1:
The patent designs the damper system to be self-maintaining through its viscous fluid-based mechanism. The fluid automatically compensates for wear and structural movement without requiring external intervention. The movable vane and viscous fluid chamber configuration eliminates the need for regular maintenance activities, allowing the system to maintain its damping function continuously without productivity loss.
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 viscous wall damper system effectively accommodates long-term settling, eliminates maintenance needs, and provides consistent damping across all displacement amplitudes, enhancing the structural integrity and resilience of the building under lateral loads without compliance or fatigue issues.
Implementation Method 1
high-viscosity fluid within the high-viscosity fluid container is sheared by the vane to damp vibrations in the building structure
Data Source
Figure 1a~1b
Figure 2a~2c
Figure 3a~3b
AI summary
A building structure in an outrigger configuration having a building core, at least one perimeter column, and at least one outrigger beam having a main body portion connected to the building core, an end portion distal from the building core in a direction of the at least one perimeter column and a vane portion extending from the end portion. At least one damper having a high-viscosity fluid container connected is connected to the at least one perimeter column and the vane portion extends into the high-viscosity fluid container to couple the building core to the at least one perimeter column, such that when the building structure is subjected to lateral loads and the building core is displaced with respect to the at least perimeter column, high-viscosity fluid within the high-viscosity fluid container is sheared by the vane to damp vibrations and provide coupling in the building structure.