具有复位功能的阻尼耗能支撑滞回模型与抗震性能研究

在传统磁流体阻尼器基础上提出了一种具有复位功能的阻尼耗能支撑，对传统Bouc-Wen模型进行了改进，建立了适用于阻尼耗能支撑的恢复力计算模型，并在Simulink环境下对改进的双Bouc-Wen模型进行仿真分析，将仿真结果与支撑有限元模拟分析结果进行了对比；基于OpenSees平台，对改进的双Bouc-Wen模型进行二次开发，并对采用具有复位功能的阻尼耗能支撑和普通防屈曲支撑的9层Benchmark钢框架结构模型进行了抗震性能对比分析。结果表明，双Bouc-Wen模型仿真得到的滞回曲线与有限元模拟得出的滞回曲线吻合较好，可以很好地描述阻尼支撑旗形滞回特性，具有复位功能的阻尼支撑可有效减小钢结构的最大层间位移及震后残余变形，阻尼耗能支撑结构具备良好的可恢复性。

STUDY ON HYSTERETIC MODEL AND SEISMIC PERFORMANCE OF DAMPING ENERGY DISSPATION BRACE WITH SELF-CENTERING CAPABILITY

On the basis of a traditional magnetorheological (MR) damper, a novel damping energy dissipation brace with self-centering capability is developed. A restoring force calculation model, the improved double Bouc-Wen model, is established to portray the hysteretic behaviors of the damping energy dissipation brace by improving the traditional Bouc-Wen model, which is simulated in Simulink environment, and the simulation results are compared with the finite element analysis results. The secondary development program of the improved double Bouc-Wen model is carried out based on OpenSees platform, and using a 9-story benchmark steel frame structure as a numerical example, the comparisons of the seismic performances between a structure with the damping energy dissipation braces and a structure with buckling restrained braces (BRBs) are conducted. The hysteretic curves obtained from the double Bouc-Wen model agree well with those obtained from the finite element simulation, and the flag-shaped hysteretic behaviors of the brace can be accurately portrayed by the proposed improved double Bouc-Wen model. The maximum interstory drift and residual deformation of a steel frame structure after earthquakes are effectively reduced, so that the structure with damping energy dissipation brace exhibits a good recovery performance.