地铁车站顶层高强钢筋节点抗震性能试验研究

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Abstract Research purposes: Due to the need to lay pipelines, thick soil cover is required above the top plate of subway stations, resulting in a large load on the top plate and causing a large cross-section of the top beam. Because of the width limitation of urban road surfaces, it is necessary to reduce the column section to save underground space, resulting in a structural form of "strong beams and weak columns", which has an unfavorable effect on the seismic resistance of the structure. To improve the seismic performance of the top node of a subway station, this paper takes the beam-column node of a certain subway station as the research object, produces scaled model specimens, and conducts low-cycle reciprocating tests to study the influence of high-strength steel bars on the seismic performance indicators such as the failure mode, bearing capacity, and energy dissipation capacity of the top node.
Research conclusions: (1) The nodes with high-strength steel bars and ordinary steel bars in the column are both failure modes of strong beams and weak columns, but the configuration of high-strength longitudinal bars can reduce the degree of column failure at the top beam nodes. (2) Configuring high-strength longitudinal bars in columns can significantly improve the bearing capacity and deformation capacity of top-level beam column nodes, delay stiffness degradation rate, enhance energy dissipation capacity, and thus improve the seismic performance of nodes. (3) The research results can provide a theoretical reference for the design optimization of beam-column joints in complex underground structures represented by subways.

Key words： subway station top-level beam column nodes high strength steel bars low cycle reciprocating load seismic performance

Received: 25 July 2024

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TU375

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	LI Hui

Cite this article:

LI Hui. Experimental Research on Seismic Performance of High-strength Steel Bar Joints on the Top Floor of Subway Stations[J]. Journal of Railway Engineering Society, 2024, 41(10): 76-82.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2024/V41/I10/76

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