中间柱型阻尼器装配式自复位钢框架数值模拟

装配式自复位钢框架具有震后结构自动复位、结构残余变形及损伤较小、可以恢复结构正常使用功能等优势。但是当装配式自复位钢框架跨度较大时，常因刚度不足导致其层间位移角不能满足抗震设计规范限值要求。为此，提出了中间柱型阻尼器装配式自复位钢框架，在拟动力试验研究基础上，通过有限元软件ABAQUS进行数值模拟，并与试验结果进行对比分析；在数值模拟校验的基础上，通过有限元分析研究了施加竖向活荷载对中间柱型阻尼器工作机制的影响。研究结果表明：数值模拟与子结构拟动力试验结果在结构位移峰值、滞回性能、索力变化等方面吻合较好，数值模拟方法可靠；中间柱型阻尼器可提高框架结构的抗侧刚度，有效控制结构层间位移角，同时提高结构耗能能力，延缓主体结构塑性发展进而保护主体结构，减小结构残余变形并控制损伤；中间柱型阻尼器装配式自复位钢框架具有良好的自复位能力，竖向活荷载对中间柱型阻尼器滞回性能及耗能能力影响不大。

Numerical simulation toward prefabricated self-centering steel frame with intermediate column containing friction dampers

Prefabricated self-centering steel frames (PSCF) have advantages of self-centering after earthquakes, possessing relatively small residual deformation and structural damage and restoring the structural function after earthquakes. While for PSCF with relatively large span, it usually has the problem of excessive inter-story drifts exceeding the recommended in code for seismic design of buildings due to inadequate lateral stiffness. To resolve this issue, the PSCF with intermediate column containing friction dampers (ICFD) was proposed. The numerical simulation by the software ABAQUS were carried out based on the pseudo-dynamic test. The comparison analysis between the results of numerical simulation and test was accomplished. On the basis of the well verification of numerical simulation, the effect that would be exerted on the working mechanism of ICFD by the vertical live load was researched. The results indicate that numerical simulation results such as peak structure displacement, hysteretic behavior, and cable force variation etc., are in good coincidence with pseudo-dynamic testing results. Therefore, the reliability of numerical simulation method is verified. The ICFD can improve the lateral stiffness, control the inter-story drift of the frame effectively and simultaneously increase the structural energy dissipation capacity as well as postpone the plasticity development of the main structure to protect it. PSCF with ICFD possess favorable self-centering function. The vertical live load exerts little effect on the hysteretic behavior and energy dissipation capacity of the dampers.