Self-Centering and Energy Dissipation at the Column Base (II)
|關鍵字:||自復位;預力;消能裝置;摩擦;形狀記憶合金;self-centering;post-tension;energy dissipation;friction;shape memory alloy|
Self-centering structures are designed with the capability of restoring to the original shape in order to reduce the residual deformation after subjected to earthquake. A post-tensioned beam and column member is an adequate way to achieve the self-centering of the structures, with the advantages of construction, self-centering and economic. Many research projects on the self-centering have been conducted. Although the post-tension can achieve the self-centering of the structures, there is merely no energy dissipation in the structures because the beam and column members are designed to remain elastic during the earthquake. To enhance the energy dissipation for the structures, an energy dissipative device can be supplemented to reduce the damage of the structures subjected to earthquake. The research in the first year aims to study the self-centering and energy dissipation for connection between the column and foundation through the use of high-strength strands, post-tensioned the column and foundation. The magnitude of the post-tension will affect the behavior of self-centering of the column. Friction type energy dissipative devices will be designed and used to enhance the structural behavior. The friction type energy dissipative devices can be installed on the column flange or column web. Theoretic derivation will be conducted to investigate the behavior of the column base with post-tension and energy dissipative device. Specimens will be further designed and tested to validate the behavior. The behavior of the column base with post-tension and energy dissipative device can be further established to benefit the construction industry. The research in this second year will utilize the shape memory alloy (SMA) between the column and foundation because the SMA possesses high axial deformation, self-centering and high damping. Instead of the use of post-tension and energy dissipative device, the SMA can provide the self-centering and dissipating energy exerted from the earthquake.