| Summary: | 碩士 === 逢甲大學 === 土木及水利工程所 === 92 === The purpose of the traditional earthquake resistance design is able to only keep the strength and stiffness of the structure. Not only the effect of ductility design is limited and incapable of conforming the requirement of the ”functionality”, but the cost is increasing substantially following the traditional earthquake resistance design because of the degree of the standard is higher after revising the code. However, the structural passive control technology has been developed rapidly over the past ten years, and recognized as a feasible and promising way in mitigating the seismic response of a structure from theoretical studies, experimental results and experiences under actual earthquakes. In numerous passive control devices, the added damping and stiffness(ADAS) has been verified as an effective and economical energy-absorbing device to dissipate the seismic energy remarkably. It has the advantage of low manufacture costs and being easy to install. Successful applications have been achieved in Taiwan actually.
The longitudinal added damping and stiffness (LADAS), a new type device, has been developed in this study. Under cyclic loading tests, the proposed LADAS device can sustain an extremely large number of yielding reversals without any sign of stiffness or strength degradation and has stable energy-dissipating capability. By modifying the Wen’s model, an advanced analytical model in an incremental form for the LADAS is also proposed to predict the nonlinear hysteresis behavior. After comparing the analytical and experimental results, it is illustrated that the proposed Wen’s model in an incremental form could successfully predict the hysteretic behavior of the LADAS device. Moreover, the quake-proof efficiency of the LADAS was carried out on a scaled-down three-story steel frame on an electronic shaking table in Feng Chia University. The experiment results demonstrate that a structure with LADASs can significantly reduce the seismic response. Comparing the experiment results with analytical results obtained from the nonlinear analysis program, NAST, we can well predict the nonlinear behavior of the structure with LADASs during earthquakes.
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