Test analysis of detection of damage to a complicated spatial model structure |
| |
Authors: | Long-He Xu Zhong-Xian Li Jia-Ru Qian |
| |
Affiliation: | Long-He Xu · Zhong-Xian Li · Jia-Ru Qian School of Civil Engineering,Beijing Jiaotong University,100044 Beijing,China School of Civil Engineering,Tianjin University,300072 Tianjin,China Department of Civil Engineering,Tsinghua University,100084 Beijing,China |
| |
Abstract: | A two-stage damage detection approach is proposed and experimentally demonstrated on a complicated spatial model structure
with a limited number of measurements. In the experiment, five known damage patterns, including 3 brace damage cases and 2
joint damage cases, were simulated by removing braces and weakening beam-column connections in the structure. The limited
acceleration response data generated by hammer impact were used for system identification, and modal parameters were extracted
by using the eigensystem realization algorithm. In the first stage, the possible damaged locations are determined by using
the damage index and the characteristics of the analytical model itself, and the extent of damage for those substructures
identified at stage I is estimated in the second stage by using a second-order eigen-sensitivity approximation method. The
main contribution of this paper is to test the two-stage method by using the real dynamic data of a complicated spatial model
structure with limited sensors. The analysis results indicate that the two-stage approach is able to detect the location of
both damage cases, only the severity of brace damage cases can be assessed, and the reasonable analytical model is critical
for successful damage detection. |
| |
Keywords: | Damage detection · Complicated structure · Two-stage approach · Eigen-sensitivity analysis · Joint damage |
本文献已被 CNKI 维普 SpringerLink 等数据库收录! |
|