Parametric study on the Multangular-Pyramid Concave Friction System (MPCFS) for seismic isolation
- PDF / 2,097,592 Bytes
- 14 Pages / 595.276 x 785.197 pts Page_size
- 55 Downloads / 176 Views
RESEARCH ARTICLE
Parametric study on the Multangular-Pyramid Concave Friction System (MPCFS) for seismic isolation Wei XIONG* , Shan-Jun ZHANG, Li-Zhong JIANG, Yao-Zhuang LI School of Civil Engineering, Central South University, Changsha 410075, China Corresponding author. E-mail: [email protected]
*
© Higher Education Press 2020
ABSTRACT A series of comprehensive parametric studies are conducted on a steel-frame structure Finite-Element (FE) model with the Multangular-Pyramid Concave Friction System (MPCFS) installed as isolators. This new introduced MPCFS system has some distinctive features when compared with conventional isolation techniques, such as increased uplift stability, improved self-centering capacity, non-resonance when subjected to near-fault earthquakes, and so on. The FE model of the MPCFS is first established and evaluated by comparison between numerical and theoretical results. The MPCFS FE model is then incorporated in a steel-frame structural model, which is subjected to three chosen earthquakes, to verify its seismic isolation. Further, parametric study with varying controlling parameters, such as isolation foundation, inclination angle, friction coefficient, and earthquake input, is carried out to extract more detailed dynamic response of the MPCFS structure. Finally, limitations of this study are discussed, and conclusions are made. The simulations testify the significant seismic isolation of the MPCFS. This indicates the MPCFS, viewed as the beneficial complementary of the existing well-established and matured isolation techniques, may be a promising tool for seismic isolation of near-fault earthquake prone zones. This verified MPCFS FE model can be incorporated in future FE analysis. The results in this research can also guide future optimal parameter design of the MPCFS. KEYWORDS seismic isolation, variable frequency, near-fault earthquake, numerical study, Multangular-Pyramid Concave Friction System
1
Introduction
Seismic isolation generally means to put a laterally soft but vertically rigid layer between the superstructure and the foundation, thus isolate the energy transmitted from the soil to the structure [1]. Further, since the fundamental period of the superstructure is dominated by the isolation layer, it can shift the structural fundamental frequency to a much smaller value and enable it to shun energy-rich range of the earthquake spectrum, which often has an energyconcentration frequency band well above 1 Hz for far-field seismic inputs. The existing seismic isolation tools can be divided down into three main types: rubber bearing (RB), sliding or rolling friction bearing, and their hybrid. The wellestablished and matured isolation techniques have successfully helped numerous buildings to suffer devastating Article history: Received Nov 26, 2019; Accepted Jan 15, 2020
earthquakes, saved thousands of precious lives and millions of dollars. Such miracles achieved by the great professionals that introduced these amazing techniques should be sincerely respected and born in mind
Data Loading...
