Abstract：Abstract：Research purposes： With the development of railway passenger station in our country, the long-span canopy without platform column was used in many railway platforms in order to increase the space of platform. The beam string structure (BSS) possesses excellent structural performance and has broad application prospects in canopy without platform column. Therefore, it is very important to identify the damage of BSS on railway platform, and to predict the ultimate carrying capacity of BSS after the damage. Research conclusions： (1) Frequency rate-of-change (FRC) and normalized frequency rate-of-change (NFRC) were suggested as the parameters of damage identification for BSS on railway platform. (2) It is suggested that NFRC1 as parameter for truss damage location, NFRC2 as parameter for strut and string damage location, and FRC3 as parameter for prestressing loss identification. (3) The relationships between modal parameter FRCi and relative ultimate carrying capacity k were suggested. (4) The study in this paper can provide a reference for the damage identification and assessment of ultimate carrying capacity for BSS on railway platform.
2017, Vol. 34 
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