SAFETYINSIDE earthquake and vibration dual control technology makes our home both safe and comfortable
2023-11-11
Transit oriented development (TOD) has become a major trend in the development of large cities for the efficient use of land. However, the vibrations generated by the operation of transportation infrastructure such as subways can lead to significant vertical vibrations in their surrounding structures, seriously affecting the comfort and physical health of the people inside the building. Especially some lightweight steel screen windows, metal cup covers, decorative repairs, and other objects inside the building may resonate and produce secondary noise, making it difficult for people to prevent. At the same time, some large cities still have a high risk of earthquakes, and structural seismic safety must be taken seriously during development. The dual control technology of building vibration can perfectly cope with the severe challenges brought by the above situation, which will be of great significance in supporting the development of urban TOD.
On November 5, 2023, a technical exchange meeting on dual control of building vibration for TOD development and an observation meeting on in-situ dynamic testing of vehicle depot cover engineering were held in Beijing. On the morning of the 5th, experts shared exciting content, and in the afternoon, everyone came to the project site to observe in-situ dynamic testing. The relevant experimental process is as follows
Part 1 Vibration Comparison Test:
Engineers install vertical excitation devices on the bottom plate of the isolation (vibration) layer and use recorded subway vibration measurement signals to simulate the vibration inside the building at night and simulate the entry of vehicles in the throat section. The specific method is to set up jacks around the vibration double control support, and compare the differences between conventional buildings and vibration double control buildings by lifting or removing the jacks in two states. In the state of lifting the building with a jack, the aluminum foil paper showed obvious vibration, and the resonant iron plate made obvious noise. The maximum recorded value at the indoor measuring point was 77.6dB. After the jack was removed, the vibration dual control support entered the working state, and the aluminum foil paper had almost no vibration. The noise generated by the resonant iron plate almost disappeared, and the maximum recorded value at the indoor measuring point was 65.5db. After vibration isolation, it decreased by 12.1db, far below the national limit of 72db, proving the superiority of the vibration isolation performance of the seismic double control support.
Part 2 Earthquake Simulation Test:
The greatest damage caused by earthquakes to buildings is the horizontal shear force. Engineers arranged two sets of actuators along the north-south direction of the staircase. One end of the actuator is installed on the support pier of the seismic double control support, and the other end is installed on the beam of the first floor. By using actuators to push the building, simulate the earthquake state, and test the effectiveness of the earthquake vibration dual control support. The actual loading earthquake action is equivalent to the local seismic fortification force, which is the force at 8 degrees and 0.2g, and the loading frequency matches the period after structural isolation. We can clearly see the upper structure swinging along the sliding surface of the support in the video, thus achieving the seismic effect of "using softness to overcome rigidity" in isolated buildings.
In summary, SAFETYINSIDE earthquake and vibration dual control technology for building vibration utilizes three-dimensional isolation (vibration) bearings that include vertical and horizontal isolation modules to achieve dual control of structural vertical vibration and horizontal vibration caused by earthquakes, making our homes both safe and comfortable, and achieving a "static" distance for subways.
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