Abstract
In view of the seismic weak component of the single-frame-type subway station structure, the three-dimensional (3D) time-domain nonlinear finite element static-dynamic coupling analysis model of interaction between soil and subway station structure is established by, respectively, using rectangular reinforced concrete (RRC) columns, circular reinforced concrete (CRC) columns, and prefabricated concrete-filled steel tube (CFST) columns with a quick-connection device proposed in this article. This analysis model is further used to investigate the influence of different types of middle columns on the seismic response characteristics of the underground structure, such as the interstory displacement angle, seismic damage, and dynamic response. The results show that, compared with the rectangular columns, the circular columns with the equal moment of inertia suffer less damage in the earthquake and have better seismic performance. The prefabricated CFST columns can effectively ensure that the middle columns of the station structure are not severely damaged and can be replaced quickly after the earthquake, which improves the overall seismic performance of the subway station structure and the rapid recovery ability of the structural function after the earthquake.
Highlights
With the continuous progress of urbanization in China, more and more cities begin to build urban rail transit and gradually adopt prefabricated structures for infrastructure construction to alleviate the increasingly serious traffic congestion [1, 2]
We were delighted to find that the prefabricated concrete-filled steel tube (CFST) columns with the quick-connection device proposed by this article can effectively improve the seismic performance of the underground structures and have the ability to quickly repair after an earthquake. e results can provide reasonable reference and guidance for the engineering practice of seismic isolation technology for the subway station structure
According to the characteristics of station structure with CFST columns proposed in this paper, a 3D integral finite element model for the soil-underground structure nonlinear dynamic interaction is established
Summary
With the continuous progress of urbanization in China, more and more cities begin to build urban rail transit and gradually adopt prefabricated structures for infrastructure construction to alleviate the increasingly serious traffic congestion [1, 2]. E existing researches on the earthquake damage mechanism of the large and complex subway station structure and the protection methods of the middle columns are still in the development stage, especially the research on postearthquake repair technology of underground structures [15, 16]. Based on the seismic damage characteristics of the DAIKAI metro station in Japan, the prefabricated concretefilled steel tube (CFST) column and its quick-connection device were proposed to improve the repairable performance of the middle columns in the most severely damaged subway station structure. We were delighted to find that the prefabricated concrete-filled steel tube (CFST) columns with the quick-connection device proposed by this article can effectively improve the seismic performance of the underground structures and have the ability to quickly repair after an earthquake. We were delighted to find that the prefabricated concrete-filled steel tube (CFST) columns with the quick-connection device proposed by this article can effectively improve the seismic performance of the underground structures and have the ability to quickly repair after an earthquake. e results can provide reasonable reference and guidance for the engineering practice of seismic isolation technology for the subway station structure
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