A large-scale dynamic test facility like a shaking table naturally has the potential to disturb its surroundings with unwanted vibration. To prevent this, the authors developed a vibration isolation system with air springs, applied it to the basement of the shaking table installed at Kajima Technical Research Institute, and obtained the anticipated results. After that, Japan Highway renewed its traffic simulator machine and, taking this opportunity, decided to install the vibration isolation system. This report presents a series of results from the design stage to performance verification testing. At the first stage, the response of the surrounding soil surface and the basement of the test facility building were measured before the renewal and the design target level of response reduction was determined. Secondly, a loading test of the air spring itself was conducted and the design specification was revised. Finally, a performance verification test was conducted on the test facility after the renewal. The test results indicate that the response of the soil surface at the site border to test machine operation was reduced to the micro tremor level.
