30 March 2009 Definition and study of life index for the needs of structural life-cycle design
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The civil infrastructures deteriorate over time and their reliability is time variant. To mitigate the deterioration of structures, the maintenance, monitoring, inspection, etc. are needed. To optimize the cost of structure, life-cycle design of structure is urgently needed. Different from current structure design theories, the design index of life-cycle design should be able to reflect the time variation of structure directly and provide reference for making maintenance decisions, but the performance indices of current design theories can't meet these requirements. For the deficiencies above, life-cycle design is introduced herein and life index of structure is defined. The properties, functions and determination principles of the structural life index are concluded as well. An example is also presented, in which the process of obtaining life index is demonstrated. The freeze-thaw action spectrum of Harbin is utilized and the life index of certain common concrete under freeze-thaw action in Harbin is obtained herein. The result shows that the life index of that concrete is only 6 years. The investigation will be helpful for controlling the structure life-cycle cost, and can promote the development of life-cycle design.
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Chi Lin, Chi Lin, Jinping Ou, Jinping Ou, } "Definition and study of life index for the needs of structural life-cycle design", Proc. SPIE 7292, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2009, 72922Z (30 March 2009); doi: 10.1117/12.817493; https://doi.org/10.1117/12.817493

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