STRUCTURAL DAMPERS

Assumptions of the example:​

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• Applied harmonic wind force:

1. Amplitude corresponds to 15m/s wind speed. (based on real recorded data of similar buildings)

2. Frequency matches the natural frequency of the building.​​

• StruFlex adjustable pot bearings function as spring & damper semi-active devices (controlled by AI learning based algorithms).

• Assumption: the chosen stiffness coefficient reduces the lateral stiffness of the building by 17,5%.

• Inherent damping ratio: 1%

• Adjacent graph:  wind-induced steady state lateral displacements with & without Struflex dampers (roof) 

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Enable rocking isolation during seismic motion (the only device that can achieve this):    ​

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StruFlex adjustable pot bearings can momentarily function as rocking isolators during a strong seismic motion, while once the strong seismic motion is over they continue to function as spring & damper systems against wind-imposed vibrations. 

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StruFlex (base) dampers - VS -  mass damper on the roof:​​​

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• ​For 17,5% lateral stiffness reduction (spring setting) -> StruFlex dampers are as effective a mass damper on the roof with mass ratio 1%

• For 35% lateral stiffness reduction (spring setting) -> StruFlex dampers are as effective as a mass damper on the roof with mass ratio 2%

• For 50% lateral stiffness reduction (spring setting) -> StruFlex dampers are as effective as a mass damper on the roof with mass ratio 3%

• For 100% lateral stiffness reduction (spring setting) -> StruFlex dampers are as effective as a mass damper on the roof with mass ratio 5%

• For 150% lateral stiffness reduction (spring setting) -> StruFlex dampers are 20% more effective than a mass damper on the roof with mass ratio 5%