Developments of performance based assessment technique for existing tunnels
The purpose of current tunnel maintenance system in South Korea is safety based maintenance system for accident prevention, So it is difficult to conduct a strategic maintenance. The development of a new maintenance system can lead to effective investment of limited financial and it's effort is still in progress. In this study, to develop a performance based assessment method, indexes for assessment are derived taking into account the safety, durability and serviceability. The indexes for performance based assessment were selected by a literature analysis and a delphi survey. Then the importance among indexes were calculated by the AHP analysis.