| Summary: | 博士 === 逢甲大學 === 土木及水利工程所 === 93 === Abstract
It is very important to prevent the seismic catastrophe, especially for populated Taiwan located in Circum-Pacific Belt which is an earthquake active area. Recently, seismic mitigation and base isolation for structures are some of the major developments for the seismic resistant design. Many studies on structural control methods and devices have been unfolded. Different control methods and devices have their own merits and deficiencies.
Adding energy-absorbing devices to structures is often a cost-effective way to reduce the effects of external loads induced by the seismic and wind forces. Based on the energy-dissipating mechanism, they can be classified into the velocity-dependent and displacement-dependent devices. Velocity-dependent devices such as fluid viscous dampers can provide additional damping to reduce the structural responses of wind and a wide range of seismic loadings. But they can’t reduce structural responses in the vicinity of the peak responses due to zero or small velocities. Displacement-dependent devices such as RADAS devices (reinforced added-damping and stiffness) can effectively provide damping and stiffness to the structure in large earthquake ground motions. However, they don’t provide any damping effects to a structure while a small earthquake or wind is not strong enough to yield the devices.
In order to eliminate the deficiencies of individual devices and enhance their merits, the combination of displacement-dependent and velocity-dependent devices by properly combinative principle would be an alternative approach. The principle of the major combinative method in this study is that displacement-dependent devices (RADAS devices) are installed on the lower floors of the buildings, and velocity-dependent devices (fluid viscous damper) are equipped on the other upper floors. It has been proved from this study through the large-scale experiments on the shaking table in the National Center for Research on Earthquake Engineering in Taiwan. Results show that the combination method is a very promising tool to enhance the seismic resistibility of structures and worthy to furthermore popularize this idea to the engineering profession for practical use to ensure the safety of structures during earthquakes.
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