期刊
SMART MATERIALS AND STRUCTURES
卷 23, 期 12, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/0964-1726/23/12/125034
关键词
structural health monitoring (SHM); damage quantification; finite element model updating; crack damage; truss bridge structure; damage identification
资金
- New Faculty Startup Fund from the University of Akron
In this paper, a multistep damage quantification method has been experimentally validated by quantifying crack damage of load-carrying members of truss structures based on experimental vibration records. Damage quantifications are still challenging tasks for difficulties in interpreting response signals measured from engineering structures. Open crack depth is parameterized as a damage variable. The open crack in Euler-Bernoulli beam element is modeled by introducing local flexibility coefficients to the uncracked beam element with joint rotational flexibility. Mode shapes and natural frequencies measured from experimental modal testing of a damaged laboratory-size truss bridge are used in the finite element model updating for damage quantification. Predetermined curves derived for hollow circular sections with open crack are used to estimate crack depths from updated local flexibility coefficients. According to experimental validation test, the proposed approach is proven to be viable in quantifying crack damage.
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