Seismic performance of base-isolated structure based on negative stiffness device with elliptical curved track

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Aug. 2026, Vol. 49 No. 8: 1113-1121

DOI: 10.3969/j.issn.1003-5060.2026.08.016

Authors

HUANG Xiao $ ^{1} $, CAO Wei $ ^{1} $, HU Zhixiang $ ^{2} $

(1. School of Civil Engineering, Anhui Jianzhu University, Hefei 230601, China; 2. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China)

Abstract and Keywords

Abstract: A novel elliptical negative stiffness device (ENSD) has been developed, comprising an elliptical curved track, preloaded springs and pulleys. Firstly, the force-displacement relationship of the ENSD was derived. Parametric studies were conducted to analyze the effects of preloaded spring stiffness, initial compression, and the aspect ratio of the elliptical track on the force-displacement characteristics of the ENSD. Then, the ENSD was applied to the base-isolated structure, and the frequency-domain response characteristics of the base-isolated structure with and without the ENSD were analyzed and compared, respectively. Finally, the seismic responses of a five-story base-isolated structure under actual earthquakes were analyzed. It was found that, by using the new negative stiffness device with elliptical curved track, the inter-story displacement and absolute acceleration of the structure at all stories were reduced to a certain extent, which further verified the effectiveness of the device.

Keywords: base-isolated structure; elliptical curved track; negative stiffness device; frequency-domain response characteristic; seismic response

作者信息

黄潇 $ ^{1} $，曹伟 $ ^{1} $，胡志祥 $ ^{2} $

(1. 安徽建筑大学土木水利学院, 安徽合肥 230601; 2. 合肥工业大学土木与水利工程学院, 安徽合肥 230009)

摘要和关键词

摘要: 文章设计了一种新型椭圆形轨道负刚度装置, 该装置由椭圆形曲面轨道、预压弹簧和滑轮组成。首先, 推导了该装置的力-位移关系表达式, 分析了预压弹簧刚度、初始预压缩量、椭圆形轨道长短半轴比值等参数对椭圆形轨道负刚度装置力-位移关系的影响; 然后, 将该负刚度装置应用到基础隔震结构中, 对分别设置椭圆形轨道负刚度装置和不设负刚度装置的基础隔震结构的频域响应特性进行分析和对比; 最后, 对实际地震动作用下5层隔震结构的地震响应进行分析。结果表明, 采用新型椭圆形曲面轨道负刚度装置, 结构各层层间位移和绝对加速度响应均有一定程度的降低, 进一步验证了该装置的有效性。

关键词: 隔震结构；椭圆形轨道；负刚度装置；频域响应特性；地震响应

Funding

国家自然科学基金资助项目（52178283）；安徽省高校省级自然科学研究资助项目（2024AH050262）

合肥工业大学学报(自然科学版)

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