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为研究跨度较大的预应力钢框架结构的可恢复功能,提出了具有可恢复功能的中间柱设有摩擦阻尼器的预应力钢框架体系,给出了中间柱摩擦阻尼器的典型构造。设计了一个8层原型结构,对底部两层平面框架子结构进行了静力推覆试验,同时采用ABAQUS有限元软件对试验进行了数值模拟。结果表明:中间柱的摩擦阻尼器在提高框架结构刚度的同时,还提高了结构的耗能能力;结构除梁翼缘加强板和柱脚翼缘出现塑性变形以外,其他主体结构始终保持弹性工作状态;第1、2层框架的层间剪力-位移滞回模型分别呈梭形和弓形。卸载后的检测结果显示,钢绞线的预应力损失很小,为结构提供了良好的自动复位和恢复结构功能的能力。
In order to study the recoverable function of the prestressed steel frame structure with large span, a prestressed steel frame system with friction damper on the middle column with recoverable function was proposed, and the typical structure of the friction damper was presented. An 8-layer prototyping structure was designed. Static subsidence test was carried out on the substructure of the two-story planar frame substructure, and the experiment was simulated by ABAQUS finite element software. The results show that the friction damper of the middle column can improve the structural energy dissipation while increasing the stiffness of the frame structure. The main structure of the structure remains flexible except for the plastic deformation of the stiffener plate and the column flange of the beam. The first-level and second-level shear-displacement hysteresis models are fusiform and arched respectively. The test results after unloading showed that the prestressing loss of the strand was very small, providing the structure with a good capability of automatically resetting and recovering the structure function.