Abstract
Relative wavelet energy entropy (RWEE) is proposed to detect and quantify damage to hysteretic dampers used for the passive seismic control of building structures. Hysteretic dampers have the role of dissipating most of the energy input of an earthquake. Minor or moderate earthquakes do not exhaust the energy dissipation capacity of the dampers, yet they damage them. For this reason, continuous or periodic damper-health evaluation is required to decide if they need to be replaced. Such evaluation calls for the application of efficient structural health monitoring techniques (SHM). This paper focuses on the well-known vibration technique, which is applied to a particular type of hysteretic damper called Web Plastifying Damper (WPD), patented by the University of Granada. Vibration signals, properly recorded by piezoelectric sensors attached around the damaged area of the dampers, are decomposed by means of wavelet packet analysis. Then, the relative wavelet energy entropy of these decompositions is used to calculate the proposed index. Validation of RWEE for this particular application involved dampers installed in two different specimens of reinforced concrete structures subjected to earthquake sequences of increasing intensity. When compared with a well-established mechanical energy-based damage index, results demonstrate that RWEE is a successful and low-cost technique for reliable in-situ monitoring of dampers.
Highlights
The passive control of structures subjected to seismic actions through the use of energy dissipating devices (EDD) is a common solution in earthquake-prone areas
The anan index to to quantify thethe damage of of hysteretic dampers subjected to random seismic‐type dynamic loadings using the correlation of hysteretic dampers subjected to random seismic‐type dynamic loadings using the correlation hysteretic dampers subjected to random seismic-type dynamic loadings using the correlation between between relative wavelet energy entropy (RWEE) and ID indices. It is based on the wavelet package decomposition of output signals between RWEE and ID indices
It is based on the wavelet package decomposition of output signals obtained from simple vibration tests conducted with low‐cost piezoelectric transducers placed on the obtained from simple vibration tests conducted with low‐cost piezoelectric transducers placed on the
Summary
The passive control of structures subjected to seismic actions through the use of energy dissipating devices (EDD) is a common solution in earthquake-prone areas. Past research has shown that the level of damage and the proximity to failure of hysteretic dampers subjected to arbitrarily cyclic loading can be reliably estimated by decomposing the force-displacement curves endured by the damper into the so-called skeleton and Bauschinger parts [1] This decomposition is the basis of a mechanical damage index called ID that has been extensively validated with static and dynamic tests. This paper proposes the use of Relative Wavelet Energy Entropy (RWEE) to evaluate damage to hysteretic dampers subjected to seismic events. This index combines wavelet transform with information entropy, taking the advantages of both techniques to obtain a reliable quantification of the damage level of the dampers.
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