地震激励下主次结构的非线性隔振与动力吸振分析

On Exploring a New Passive Strategy for Vibration Control of a High-Rise Primary-Secondary Structure under Earthquake Excitations

对一个主次结构简化模型在 Niigata地震激励下的演变随机响应进行了分析。计算结果表明 :融动力吸振与非线性隔振为一体的抗振设计可取得良好的减振效果 ,使主结构响应大幅降低。这一被动抗振方案以及分析中所采用的、与统计线性化法相结合的演变随机响应问题的统一解法 。

A new passive strategy is explored to dissipate the vibration energy due to earthquake by mixing two traditional strategies: (1) the flank-structure as a dynamic absorber; (2) the nonlinear isolation of primary high-rise structure and a separate nonlinear isolation of the secondary flank structure. We model the ground motion as an evolutionary random process characteristic of the 1964 earthquake of Niigata, Japan and use the Bouc-Wen hysteresis model to describe the elastoplastic behavior of the isolating material. Thus, the vibration response of such a primary-secondary system should be a nonlinear evolutionary one. A unified approach and the statistical linearization technique are used to solve the vibration response problem of the simplified model for a high-rise primary-secondary structure. A numerical example is given. The results indicate that the new passive strategy can dissipate the vibration energy better than either of the two traditional strategies.