Application of Non-Destructive Test, Stress Method, on Buckling Restrained Braces
Date Issued
2007
Date
2007
Author(s)
Tsai, Cheng-Lin
DOI
zh-TW
Abstract
The motive of this research is to use one of the nondestructive testing methods, stress wave method, to test the energy dissipation element, buckling restrained brace (BRB), which is used in high-rise structures.
In this project, we implement the numerical simulations first. We make use of the commercial software, LS-Dyna, to process the finite element analysis and calculate the wave propagation responses of the core element in the BRB. In numerical simulations, we consider different levels and positions of the defects, and analyze the response signals of different damage conditions. We use time domain analysis, Fourier analysis, Wavelet analysis, and Hilbert-Huang analysis as our signal process methods. We hope that we can get some damage index which can show the damage level efficiently. Second, we operate the NDT method in coordination with another experiment about the BRB executed by National Center of Research on Earthquake Engineering (NCREE). The BRB specimen will sustain several sets of ground acceleration. We process the NDT method and measure the signals after the BRB sustained each set of ground acceleration, and observe the change of the signal measured indifferent stage. Finally, we use simulated and experimental signals to confirm the feasibility of the signal process method.
Subjects
非破壞檢測
挫屈束制支撐
應力波
傅利葉分析
小波分析
希爾伯-黃分析
NDT
BRB
stress wave
Fourier analysis
Wavelet analysis
Hilbert-Huang analysis
Type
thesis