Abstract
Aging of buildings during their service life has attracted the attention of researchers on structural health monitoring (SHM). This paper is related with detecting damage in building structures at the earliest possible stage during seismic activity to facilitate decision-making on evacuation before physical inspection is possible. For this, a simple method for damage assessment is introduced to identify the damage story of multistory buildings from acceleration measurements under a wave propagation approach. In this work, damage is assumed as reduction in shear wave velocities and changes in damping ratios that are directly related with stiffness loss. Most damage detection methods are off-line processes; this is not the case with this method. First, a real-time identification system is introduced to estimate the current parameters to be compared with nominal values to detect any changes in the characteristics that may indicate damage in the building. In addition, this identification system is robust to constant disturbances and measurement noise. The time needed to complete parameter identification is shorter compared to the typically wave method, and the damage assessment can keep up with the data flow in real time. Finally, using a robust threshold, postprocess of the compared signal is performed to find the location of the possible damage. The performance of the proposed method is demonstrated through experiments on a reduced-scale five-story building, showing the ability of the proposed method to improve early stage structural health monitoring.
Highlights
Structures like buildings are frequently exposed to various kinds of damages during their service life mainly due to the continuous deterioration caused by material degradation, corrosion, fatigue, and unexpected heavy loads induced by earthquakes and strong winds
A five-story building prototype, as shown in Figure 4(a), isused to evaluate the performance of the proposed damage location algorithm. e building is made from aluminum, with the exception of three columns that are made from brass. e dimensions of the columns of the first and the remaining fourth floors are 0.635 × 0.635 × 31.5 cm and 0.635 × 0.635 × 36 cm, respectively
Considering that the first story has an attachment to the base with an height of 4.5 cm, the structure has dimensions of 60 × 50 × 180 cm, and it is mounted on a shaking table actuated by servomotors from Parker, model 406T03LXR, which can be moved in the xaxis and y-axis of the horizontal plane, respectively
Summary
Structures like buildings are frequently exposed to various kinds of damages during their service life mainly due to the continuous deterioration caused by material degradation, corrosion, fatigue, and unexpected heavy loads induced by earthquakes and strong winds. In [22], the application of Derringer’s function-based weighted model updating method for damage detection in a simulated cantilever beam structure is investigated. In this method, FEMU is treated as a multiobjective optimization problem, where the number of objectives needs to be defined in such a way as to reduce errors in responses predicted by the FE model. Two important features are included: (i) a new parameterization of the identification system problem to estimate velocities and damping coefficient and (ii) a methodology to locate possible damage, which is based on comparing changes in the wave parameters, processing these changes, and assessing damage using appropriate thresholds. Where 0p×p and Ip×p denote, respectively, the null and identity matrices of size (p × p)
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