| Title |
An Experimental Test for Air-tightness Performance Evaluation of Cracked Concrete Vacuum Tube Structures |
| Authors |
박주남(Park, Joonam) ; 박형준(Park, Hyeong-Jun) |
| DOI |
https://doi.org/10.12652/Ksce.2018.38.3.0377 |
| Keywords |
초고속 진공튜브;콘크리트 튜브;균열;기밀성 실험 Super-Speed vacuum tube;Concrete tube;Crack;Air-tightness test |
| Abstract |
Super-speed vacuum tube system, where the air resistance is minimized to obtain high speed of the vehicle, is considered to be a viable alternative transportation system. Air-tightness is one of the most important design requirements of the system, because the internal pressure of the system needs to be maintained significantly lower than the atmospheric pressure. This study performed an experimental test, where a series of concrete tube specimens were applied by external loads to induce cracks and the effective air-permeability of the cracked tube structures were measured. The test results indicates that the information on the length and the width of the load-induced cracks are not enough to anticipate the system air-tightness, whereas the load-induced displacement has higher correlation with the systems air-tightness. Based on these results, a direction of future research for effect of the load-induced cracks on the system air-tightness is suggested. |