SJB Institute of Technology, Bangalore, Karnataka, India.
Department of Civil and Environmental Engineering, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia.
Sci Rep. 2023 Mar 27;13(1):4980. doi: 10.1038/s41598-023-31482-2.
In order to increase the efficiency of the structures to resist seismic excitation, combinations of inerter, negative stiffness, and tuned mass damper are used. In the present work, the optimum tuning frequency ratio and damping of the tuned mass negative stiffness damper-inerter (TMNSDI) for the base-isolated structure were determined by employing the numerical searching technique under filtered white-noise earthquake excitation and stationary white noise. The energy dissipation index, the absolute acceleration, and the relative displacement of the isolated structure were considered as the optimum parameters, obtained by their maximization. Evaluations of base-isolated structures with and without TMNSDI under non-stationary seismic excitations were investigated. The efficiency of the optimally designed TMNSDI for isolated flexible structures in controlling seismic responses (pulse-type, and real earthquakes) were evaluated in terms of acceleration and displacement. A dynamic system was used for deriving the tuning frequency and tuned mass negative stiffness damper inerter (TMNSDI) for white noise excitation by using explicit formulae of the curve fitting method. The proposed empirical expressions, for design of base-isolated structures with supplementary TMNSDI, showed lesser error. Fragility curve results and story drift ratio indicate reduction in seismic response by 40% and 70% in base-isolated structure using TMNSDI.
为了提高结构抵抗地震激励的效率，使用了惯容器、负刚度和调谐质量阻尼器的组合。在本工作中，通过采用滤波白噪声地震激励和平稳白噪声下的数值搜索技术，确定了基础隔震结构中调谐质量负刚度惯容器（TMNSDI）的最佳调谐频率比和阻尼。将隔离结构的能量耗散指数、绝对加速度和相对位移作为最优参数，通过最大化来获得。研究了非平稳地震激励下带和不带 TMNSDI 的基础隔震结构。从加速度和位移两个方面评价了最优设计的 TMNSDI 对控制地震响应（脉冲型和真实地震）的有效性。通过使用曲线拟合方法的显式公式，为白噪声激励推导了调谐频率和调谐质量负刚度阻尼器惯容器（TMNSDI）的动力系统。提出的带有补充 TMNSDI 的基础隔震结构设计的经验表达式误差较小。易损性曲线结果和层间位移比表明，使用 TMNSDI 可使基础隔震结构的地震响应减少 40%和 70%。
