Seismic Behavior of a Post-tensioned Steel Column Base with Friction Devices
|關鍵字:||預力;自復位;消能裝置;摩擦;基礎;post-tensioned;self-centering;energy dissipation device;friction;foundation|
This research aims to investigate the seismic behavior of a post-tensioned steel column base with friction devices, and study the effects of initial post-tensioned force of strands and energy dissipation devices. The column and foundation is joined by using high-strength strands to provide self-centering behavior, and the friction type energy dissipation devices are used to provide hysteretic behavior. Therefore, the column possesses characteristics of self-centering and no residual deformation. The parameters include the initial post-tensioned force, the area of the energy dissipation, and location of friction energy dissipation devices. The behavior of the joint was established analytically and experimentally. The results demonstrated that increasing post-tensioned force of the bolts used for friction energy dissipation devices could effectively increase the area of the energy dissipation. Increasing the initial post-tensioned force of the strands moved up the hysteretic loop and ensured self-centering of the column. The energy dissipation devices installed at the column flange rather than column web led to better energy dissipation behavior and more economic. The joint between the column and foundation, with friction energy dissipation devices, possesses self-centering, gap opening and closing at the column-to-foundation interface, energy dissipation characteristics, and no residual deformation of the column. Moreover, analytical prediction correlated well with experimental results.