Affiliation:
1. College of Civil Engineering, Southwest Forestry University, Kunming 650000, China
2. College of Civil Engineering, Southwest Jiaotong University, Chengdu 610000, China
Abstract
The double-story isolation structure is a novel development based on the mid-story isolation structure. To accurately reflect the seismic response of the double-story isolation structure, this study considers a dynamic elastoplastic analysis model that incorporates soil–structure interaction (SSI). Comparative models of a base-fixed structure and a mid-story isolation structure are also established. The results indicate that the double-story isolation structure has a longer structural period compared to the mid-story isolation structure. Furthermore, the structural period increases as the soil softens and the structure becomes more flexible. When considering SSI on hard soil versus not considering SSI, the double-story isolation structure exhibits smaller base shear, story force, inter-story displacement, maximum acceleration of the top floor, and displacement of the upper isolation layer, indicating the significant shock-absorbing effect of the double-story isolation structure. However, when SSI is considered on soft soil, the shock-absorbing effect of the isolation structure diminishes, and the effectiveness of the double-story isolation structure may not necessarily surpass that of the mid-story isolation structure. In all three soil conditions, the compressive stresses of the isolation bearings in the upper isolation layer of the double-story isolation structure were lower than those in the isolation bearings of the base isolation layer. Additionally, the double-story isolation structure demonstrates reduced compressive stress in the isolation bearings, fewer plastic hinges in the frame, and less stress damage compared to the mid-story isolation structure. Consequently, the risk of overturning damage in the double-story isolation structure is significantly reduced compared to the mid-story isolation structure. The effect of soft ground on structures can be highly detrimental, which should be paid more attention to during the design process. This study offers valuable insights for future research on double-story isolation systems and serves as a reference for the development of high-performance building structures in the future.
Funder
National Natural Science foundation of China
High-level Talent Support Project of Yunnan Province, China
Subject
Building and Construction,Civil and Structural Engineering,Architecture
Reference34 articles.
1. Chai, W.C. (1996). Mega-Sub Control of High-Rise Building, University of California.
2. Seismic resilient base isolated structure equipped with super-large displacement friction pendulum bearing and isolated structure equipped with multi-super-large displacement friction pendulum bearing;Ou;J. Disaster Prev. Mitig. Eng.,2021
3. System identification of mid-story isolation building using both ambient and earthquake response data;Loh;Struct. Control Health Monit.,2013
4. Model reduction and optimal parameters of mid-story isolation systems;Zhou;Eng. Struct.,2016
5. New experimental system for base-isolated structures with various dampers and limit aspect ratio;Takewaki;Earthq. Struct.,2013