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  Development of Performance-Based Tunnel Evaluation Methodology and Performance Evaluation of Existing Road Tunnels

  The concept of performance-based design, which mainly focuses on mechanical performance, has become the international standard, as in the case for International Standards organisation (ISO). The standardization of tunnel design has not been achieved because it requires the integration of separate specialized fields, such as geotechnical engineering, structural engineering and concrete engineering. It is also required to clarify performance-based criteria for tunnel structures to suit specific use purposes, establish the concept of survey, planning, design, construction and maintenance based on such criteria, and develop proper management systems for operation and maintenance to suit specific tunnel use purposes. To this end, it is vital to develop a methodology for evaluating and verifying the performance of existing tunnels. This paper presents a new concept of performance requirements for tunnel structures.

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