调谐惯容系统的混合隔震体系一致性优化设计

Uniform optimization design of tuned inerter dampers in hybrid base isolation systems

基础隔震技术广泛应用于建筑结构以减轻结构的地震响应。值得注意的是,在隔震体系中减小主结构的加速度响应是以牺牲隔震器变形为代价的。调谐惯容系统(TID)和隔震器组成的混合隔震体系可减小隔震层的位移响应。与传统调谐质量阻尼器(TMD)结构类似,TID由惯容、调谐弹簧和阻尼元件组成。因此,可直接利用TMD减震系统的设计公式来确定TID的最优参数。首先基于单自由度体系(SDOF)附加TID的运动方程,推导分析两种TID和TMD设计公式,对两者设计公式的前提条件和适用性进行深入的探讨。其后,借助基础隔震体系的benchmark模型来检验设计TID的可行性和有效性。数值模拟结果表明,在不增加主结构绝对加速度响应的情况下,TID能够显著减小基础隔震结构的位移响应和基底剪力。

The base isolation technique is widely applied in building structures to mitigate structural seismic responses,while the acceleration response of the main structure is reduced at the cost of isolator deformation in the isolation system.A hybrid isolation system comprising a tuned inerter damper(TID)and an isolator can remarkably reduce the displacement response of the isolation layer.Similar to a traditional tuned mass damper(TMD),a TID comprises an inerter,tuning springs,and damping elements.Therefore,the design formula of the TMD system can be directly used to determine the optimal parameters of TID.First,two design formulas of TID and TMD were derived and analyzed on the basis of motion equations of the single-degree-of-freedom system with additional TID.Then,the precondition and applicability of the two formulas were comprehensively discussed.Finally,the feasibility and effectiveness of the designed TID were validated by the benchmark model of the base isolation system.Numerical simulation results illustrate that the designed TID can significantly reduce the displacement and base shear responses of the base isolation structure without increasing the absolute acceleration response of the main structure.