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There is approximately 1.5 times the difference between each earthquake level. Different earthquake levels are defined to be used in the 'Performance Assessment and Design ' section, which was not available in DBYBHY 2007 and was added as a new assessment and design approach with TBDY 2018 for the first time . In accordance with the philosophy of 'Performance-Based Evaluation and Design' , design is not made with a single earthquake level, it is necessary to make calculations and designs for different earthquake levels.
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