在底层隔离结构中的隔离层的过特性和摇摆桌验证试验
Tianni Xu1,2, Yiming Wang3, Qin Meng1
1Chengdu Industrial Vocational Technical College, Chengdu, 610000, China.
Scientific reports
|July 2, 2025
概括
通过使用过响应频谱 (FRS) 来改进设计长期基层隔离结构. 这种方法,考虑到隔离轴承的阻尼,提供了一个比传统的设计响应光谱 (DRS) 更合理的方法.
科学领域:
- 地震学和地震工程学
- 结构动力学 结构动力学
- 土木工程 土木工程是指土木工程.
背景情况:
- 基地隔离结构对于关键基础设施至关重要,但当前的地震设计方法与长期结构相斗争.
- 现有的响应频谱方法在准确评估基础隔离系统的地震作用方面存在局限性.
研究的目的:
- 分析基础隔离结构中隔离层的地震过特性.
- 为更合理的结构设计提出和验证过响应频谱 (FRS) 的使用.
- 为了解决长期结构的传统设计响应光谱 (DRS) 的局限性.
主要方法:
- 开发了一种两度自由度 (2DOF) 模型,其中包含了绝缘轴承的不成比例阻尼.
- 对原始和减弱的地面运动进行了光谱分析,以了解隔离层过.
- 通过使用白噪声和地震激发进行了摇桌测试,以验证理论发现.
主要成果:
- 振动表测试证实了显著的过效应,将加速时间历史减少到原始峰值的1/3-1/2.
- 与DRS相比,过响应频谱 (FRS) 显示了较小的峰值,向右转移和缩短的平台段.
- 理论和实验结果验证了FRS作为比传统DRS更合理的设计基础.
结论:
- 隔离轴承的过原理是其有效性的关键,特别是在长周期结构中,超过了简单的周期延长.
- 当前的地震设计代码不充分地代表了基础隔离结构所经历的过的地震输入.
- 需要对设计规范进行修订,以包括隔离特定的过光谱,以实现合理和资源高效的地震设计.
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