| Autor: |
Derek L. Watry, James T. Nelson, Sarah E. Kaddatz, Patrick G. Faner, Thomas F. Bergen, Michael A. Amato |
| Rok vydání: |
2018 |
| Předmět: |
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| Zdroj: |
Notes on Numerical Fluid Mechanics and Multidisciplinary Design ISBN: 9783319734101 |
| DOI: |
10.1007/978-3-319-73411-8_48 |
| Popis: |
Sound Transit is constructing twin-bored tunnels under the University of Washington campus in Seattle, Washington, USA. The tunnels will include high-performance floating slab track isolation to control ground vibration in research laboratories and satisfy the terms of an agreement between Sound Transit and the university. The agreement includes provisions for liquidated damages in the event that vibration exceeds specified limits for third octave band vibration between 2 and 100 Hz in the laboratories. The floating slab design consists of discontinuous concrete double-ties with high compliance direct fixation fasteners supporting RE115 rail. Four natural rubber main support pads and two bonded natural rubber side pads isolate each slab from the tunnel invert. The nominal design resonance of the floating slab track is 5.5 Hz. The unique floating slab track design incorporates a magnetic field cancellation cable suspended beneath the slab track in an inverted trough. The magnetic field cancellation cable presents unique design challenges for operation, maintenance, and construction. A prototype of the floating slab of length 131 m has been installed in a tunnel that is not on the campus to verify performance. This paper presents and discusses the results of measurements of the dynamic response and vibration isolation effectiveness of the track isolation, and comparisons with theoretical calculations. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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