Abstract
Reduction of road traffic-induced vibrations has gained importance with rapid development of high-tech industry and nanotechnology. This study focuses on the in situ vibration measurement and transmissibility-based vibration prediction for the foundation slab design of a high-tech lab subjected to truck-induced vibrations. The truck-induced vibrations come from a proposed road 30 m away from the high-tech lab. The allowable vertical vibration velocity for the foundation slab of the high-tech lab was 60 μm/s in the frequency range of 5–50 Hz. The truck-induced ground vibrations in the proximity of an existing road with the same design as the proposed road were taken as the vibration source response used in the foundation design. The ground vibration transmissibility from the proposed road area to the high-tech lab area was determined by conducting frequency sweep tests in the free field. Based on the vibration source response and the ground vibration transmissibility, two antivibration foundation prototypes with different thicknesses were constructed at the site. The vibration transmissibility from the subgrade soil to the surfaces of the two foundation prototypes was obtained by measuring the ground vibrations at the high-tech lab area and the surface vibrations of the two foundation prototypes. The vertical vibration velocities of the two foundation prototypes were predicted based on the measured transmissibility and the vibration source response. The final thickness of the antivibration foundation was determined by comparing the predicted vibration velocities with the allowable vibration velocity. After construction of the high-tech lab and the road, vibration tests were conducted to assess the performance of the actual antivibration foundation. The results showed that the actual antivibration foundation was able to reduce the vibration levels at the high-tech lab to acceptable levels.
Highlights
Technological advances in nanotechnology and high-tech industry require an increase in the precision of high-tech equipment, i.e., scanning electron microscopes, lithography steppers, coordinate measuring machines
(5) To quantify the transmissibility of vibrations transmitted via the subgrade soil to the surfaces of the antivibration foundation prototypes, measurements were performed on the two foundation prototypes based on frequency sweep testing
Vibration Source Response. e 8-second velocity time histories of the ground vibrations before and after the truck passed the test location were taken to determine the vibration source response used in the antivibration foundation design
Summary
Technological advances in nanotechnology and high-tech industry require an increase in the precision of high-tech equipment, i.e., scanning electron microscopes, lithography steppers, coordinate measuring machines. Gao et al [18] performed field measurement and finite-element prediction on a high-tech electronics workshop to study the reduction effect of a pile-raft foundation on floor vibrations. Amick et al [20] studied the vibration reduction efficiency of different slab types via vibration measurements and found that the piled-slab foundation performed better than the slab-on-grade foundation in reducing the vertical vibrations generated by external excitation sources. E vibration criterion was that the vertical vibration velocity at the surface of the antivibration foundation must not exceed 60 μm/s in the frequency range of 5–50 Hz. e road that the truck-induced vibrations come from is to be constructed simultaneously with the high-tech lab. To obtain the vibration source response used in the antivibration foundation design, the truck-induced ground vibrations in the proximity of an existing road with the same design as the proposed road were measured at the construction site. After construction of the hightech lab and the road, the vibrations generated by the passage of a heavy truck on the road were measured to assess the performance of the actual antivibration foundation
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