地铁车站顶层高强钢筋节点抗震性能试验研究  

Experimental Research on Seismic Performance of High-strength Steel Bar Joints on the Top Floor of Subway Stations

作　　者：李辉[1] LI Hui(China Railway First Survey and Design Institute Group Co.Ltd,Xi’an,Shaanxi 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司,西安710043

出　　处：《铁道工程学报》2024年第10期76-82,116,共8页Journal of Railway Engineering Society

摘　　要：研究目的:地铁车站顶板上方由于铺设管线需要,要求覆土较厚,造成顶板荷载较大,导致顶梁截面增大;由于城市路面宽度限制,需减小柱截面,以节约地下使用空间,形成“强梁弱柱”的结构形式,对结构抗震带来不利影响。为提高地铁车站顶节点抗震性能,本文以某地铁车站梁柱节点为研究对象,制作缩小尺寸(缩尺)模型试件,开展低周往复试验,研究柱中配置高强钢筋对顶节点破坏形态、承载能力、耗能能力等抗震性能指标的影响。研究结论:(1)柱中配置高强钢筋和普通钢筋的节点,均为强梁弱柱式的破坏形态,但配置高强纵筋能够减轻顶层梁节点处柱的破坏程度;(2)在柱中配置高强纵筋能够明显提升顶层梁柱节点的承载和变形能力,延缓刚度退化速率,提高耗能能力,从而改善节点抗震性能;(3)本研究成果可为以地铁为代表的复杂地下结构梁柱节点的设计优化提供一定的理论参考。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.

关 键 词：地铁车站 顶层梁柱节点 高强钢筋 低周往复荷载 抗震性能 

分 类 号：TU375[建筑科学—结构工程]