ACHIEVEMENTS Reduces unwanted swaying! Cantilevered Floor Walking Vibration Countermeasures
vibration suppression equipment
Cantilevered floor overhangs are prone to swaying, which can cause discomfort and loss of usability. The TMD vibration control device installed in the bosom of the ceiling can provide countermeasures without major design changes.
issue
Cantilevered floor overhangs are often problematic in terms of deflection and vibration, which can affect occupant performance.
In a certain S-structure office building, a cantilevered terrace with a 7-meter overhang was planned, and floor swaying during walking was a concern (Figure 1).
Figure 1.
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counter-measure
Vibration countermeasures include ensuring sufficient beam rigidity or installing inter-columns at the ends. In this case, however, a vibration control device was used to suppress swaying without structural design changes, and a TMD with a mass of 500 kg was installed in the bosom of the ceiling (Figure 2) (Table 1).
Heel excitation was performed at the center of the span to check the natural frequencies. The floor was at 11.2 Hz, and the TMD frequency was adjusted accordingly (Figure 3).
Figure 2: TMD exterior (left) and installation (right)
Table 1: TMD basic specifications
Figure 3: Measurement results of response vibration acceleration when heel excitation is applied.
The world of fashion is constantly changing, and it can be difficult to keep up. But there are a few key trends that have emerged in recent years. One of these trends is the increasing popularity of sustainable fashion. This means that more and more people are choosing to buy clothes that are made from eco-friendly materials and produced in an ethical way. Another trend is the rise of "athleisure." This is a style of clothing that blends athletic wear with everyday fashion, allowing people to be comfortable and stylish at the same time. Finally, we're seeing a growing interest in vintage and secondhand clothing. This trend is driven by a desire for unique pieces and a rejection of fast fashion. These are just a few of the many trends that are shaping the fashion industry today.
result
After installation of the TMD, two people walked in sync to confirm the vibration control effect. Vibration was reduced from 3.4 [cm/s2] when the TMD was not damped to 1.0 [cm/s2] after damping, a reduction of approximately 1/3 or less. In addition, the occupant environment has been greatly improved, with a rating of "not so bothersome" instead of "somewhat bothersome" according to the occupant performance evaluation criteria of the Architectural Institute of Japan (Figure 4).
Figure 4: Effects of TMD Measurement results during two-person resonant walking
The world of fashion is constantly changing, and it can be difficult to keep up. But there are a few key trends that have emerged in recent years. One of these trends is the increasing popularity of sustainable fashion. This means that more and more people are choosing to buy clothes that are made from eco-friendly materials and produced in an ethical way. Another trend is the rise of "athleisure." This is a style of clothing that blends athletic wear with everyday fashion, allowing people to be comfortable and stylish at the same time. Finally, we're seeing a growing interest in vintage and secondhand clothing. This trend is driven by a desire for unique pieces and a rejection of fast fashion. These are just a few of the many trends that are shaping the fashion industry today.
Related Pages
- added. This report compares AMD (Active Mass Damper) and TMD (Tuned Mass Damper), which are commonly used as vibration countermeasures for building floors, in terms of features, cost, and ease of maintenance. Please use this report when considering vibration countermeasures.
- Product Information TMD (Tuned Mass Damper)
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