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| 设置负刚度装置的基础隔震结构地震易损性分析 |
| Seismic Fragility Analysis of Base-isolated Structures with Negative Stiffness Devices |
| 投稿时间：2025-03-26 修订日期：2025-05-12 |
| DOI： |
| 中文关键词: 基础隔震结构 负刚度 频响特性 地震响应 易损性分析 |
| 英文关键词: base-isolated structure negative stiffness frequency response earthquake response fragility analysis |
| 基金项目:安徽省高校省级自然科学研究项目(2024AH050262) |
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| 中文摘要: |
| 在基础隔震结构的隔震层并联设置负刚度装置，可以调节隔震结构的动力特性。考虑3种不同的基础隔震结构，分别为无负刚度装置、隔震层并联预压弹簧纯负刚度元件、隔震层并联阻尼负刚度装置。首先对这3种隔震结构进行频域响应特性对比分析，结合频域分析结果挑选近断层长周期地震作用，然后进行易损性分析和性能评估。结果表明，设置纯负刚度元件对高频激励下基础隔震结构的地震响应有一定的抑制作用，设置阻尼负刚度装置可以在更宽的频率区间内减小隔震结构的地震响应，并且幅值也有很大程度降低；在近断层长周期地震动作用下，设置纯负刚度元件能够减轻上部结构的失效概率但是可能会增大隔震层的失效概率，设置阻尼负刚度装置对上部结构和隔震层的失效概率都能有一定程度的降低。 |
| 英文摘要: |
| The dynamic characteristics of base-isolated structures can be adjusted by setting negative stiffness devices in parallel with the isolation layers. Three different types of base-isolated structures are considered, namely the structure without negative stiffness devices, the structure with pure negative stiffness elements and the structure with damping negative stiffness devices .The frequency domain response characteristics were analyzed and compared. Based on the results of the frequency domain analysis, the near-fault long-period seismic actions were selected, and the seismic fragility of these three types of isolated structures was analyzed. The results show that setting pure negative stiffness elements has a certain inhibitory effect on the seismic responses of base-isolated structures under high-frequency excitation. Installing damping negative stiffness devices can suppress the seismic responses of the isolated structures within a wider frequency range, and the amplitude is also significantly reduced. Under the action of near-fault long-period ground motions, setting pure negative stiffness elements can reduce the failure probability of the superstructure, but it may increase the failure probability of the isolation layer. Installing damping negative stiffness devices can reduce the failure probabilities of both the superstructure and the isolation layer to a certain extent. |
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