High winds threaten to deteriorate hotel occupancy! TMD for horizontal vibration can solve the problem!
In a luxury urban hotel characterized by its elongated flat shape, there was concern that wind-induced vibration would worsen occupant comfort. By installing TMDs for horizontal vibration, occupant comfort was ensured without reducing the exclusive area.
issue
Recently, small luxury hotels, small-scale luxury hotels that are full of character and attention to detail, have been attracting attention.With an emphasis on luxury, they offer a high level of comfort, design, and personalized service.
A certain hotel was also planned as a small-scale luxury urban hotel with a stylish design featuring long corridors that took advantage of the long, narrow urban lot (Table 1). However, due to its long and narrow plan shape, the hotel was prone to swaying in the shortitudinal direction (X direction) due to strong winds, and there were concerns that this would worsen the occupant comfort of the guest rooms.
As a countermeasure, we decided to use horizontal TMDs, which can be installed several units on the roof to prevent wind sway, as we did not want to waste as much of our exclusive area as possible due to the narrow site.
Table 1: Building Summary
counter-measure
First, wind velocities were set based on the Building Load Guidelines for a reproduction period of one year, simulations were performed, and a preliminary evaluation was conducted using the Building Society of Japan's "Occupant Performance Evaluation Criteria". In the case of no countermeasures, the result was H-VI "rather uneasy and rather uncomfortable," and it was determined that this could be improved by installing vibration control measures.
Next, we evaluated the results of the simulation with the TMD in place and found that the level dropped one rank, to “not very anxious/not very uncomfortable”.
Figure 1: Preliminary simulation results
A pendulum-type horizontal TMD with a mass of 5 tons, which can achieve high performance even with minute movements caused by wind, was adopted, and three units were installed on the rooftop floor (Figure 2) (Table 2).
Figure 3: TMD installation status
Table 2. equipment summary
result
As a result of the countermeasures, the damping ratio was reduced by TMD from about 1.5% to 4%, allowing the shaking to subside quickly (Figure 3).
We were able to ensure a level of livability that does not cause anxiety or discomfort without decreasing the area of the building.
Figure 3. free vibration measurement results (left: X-direction, right: Y-direction)
Related Pages
- Wind shakes the building? How to achieve comfortable occupancy?
- 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)