巨-子结构减震体系基于能量的参数优化分析

PARAMETERS OPTIMIZATION ANALYSIS OF THE MEGA-SUB CONTROL SYSTEM BASED ON ENERGY

建立了巨-子减震结构体系简化模型的运动方程,推导了结构弹性变形能等效速率功率谱。结构在随机地震激励下,分别以巨-子结构底层主结构弹性变形能和等效两自由度体系下部结构弹性变形能最小为优化目标,对比分析其最优参数以及减震系数。结果表明,质量比较小时减震机理表现为TMD质量调谐,质量比较大时为基础隔震,而中间区域为层间隔震。最后,通过减震系数的对比,体现了巨-子减震结构具有更好的鲁棒性。

The motion equation of the simplified model of the mega-sub structure control system was established in this paper, and the equivalent velocity power spectrum of elastic deformation energy was deduced. Based on the minimum elastic deformation energy at the bottom of structures, the optimal pa- rameters of control devices and damping effectiveness were compared between the mega-sub structure and the equivalent two degree of freedom system under random seismic excitation. The results show that the working mechanism of the mega-sub control structure changes from tuned vibration absorber, mid-story i- solation into base isolation with the increase of the substructure mass. Finally, the comparison of the damping coefficients indicates that the mega-sub control structure has a better robustness than the mid- story isolation structure.