深圳岗厦北综合交通枢纽大尺寸钢管混凝土半埋 入式柱脚性能试验研究  

Experimental study on mechanical properties of large-scale and semi-embedded concrete-filled steel tubular column base in Shenzhen Gangxia North comprehensive transportation hub

作　　者：张素梅 罗贤志 李爱东 张晨明 王玉银[3] 郭兰慧[3] 宋帛洋 张磊 ZHANG Sumei;LUO Xianzhi;LI Aidong;ZHANG Chenming;WANG Yuyin;GUO Lanhui;SONG Boyang;ZHANG Lei(School of Civil and Environmental Engineering,Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;China Railway Design Corporation,Tianjin 300308,China;School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China)

机构地区：[1]哈尔滨工业大学(深圳)土木与环境工程学院,深圳518055 [2]中国铁路设计集团有限公司,天津300308 [3]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《建筑结构》2024年第8期1-10,90,共11页Building Structure

基　　金：中国铁路设计集团有限公司科技开发课题(2018⁃029);国家自然科学基金(51778185)。

摘　　要：深圳岗厦北综合交通枢纽位于地下空间资源紧张的城市核心区,规模巨大且荷载工况复杂,核心换乘区设有51.2m×48.0m的无柱超大跨中庭。为解决由场地条件限制导致的柱脚埋深不足问题,结合已有研究成果和工程实践经验,依托深圳岗厦北综合交通枢纽,提出并设计了半埋入式钢管混凝土柱脚节点。为检验节点可靠性,通过1/5大比例缩尺模型试验结合数值分析研究了轴力、剪力和弯矩共同作用下的半埋入式柱脚节点的力学响应,分析了柱脚内部的应力分布规律,揭示了同时设置环板和栓钉作为抗剪连接件时的工作机理。分析结果表明:设计荷载工况下,钢管混凝土柱轴力主要通过环板和柱脚底板传递,弯矩主要通过钢管侧壁承压传递;环板埋深较浅时可以获得较高的传力效率,但其下部混凝土易出现应力集中;钢管侧壁栓钉在埋置深度范围内均能够较好地发挥抗剪作用。承台下部桩基布置合理,设计荷载工况下未见承台冲切破坏特征、节点整体处于弹性工作状态;1.2倍设计荷载工况下节点刚度仍未见明显退化,节点混凝土未出现压溃或剥落,表面无可见裂缝发展,各关键位置钢材应力低于材料强度。设置环板和栓钉作为剪力连接件的半埋入式柱脚可以实现对钢管混凝土柱的可靠嵌固,提出的采用抗剪环板加强的钢管混凝土半埋入式柱脚节点设计与构造方案合理可行,满足结构安全要求。Shenzhen Gangxia North comprehensive transportation hub is in the downtown where available underground space is insufficient.The hub has a huge scale and complex loading conditions,and its core interchange area has a column-free super-large-span atrium of 51.2m×48.0m.To solve the problem of insufficient column base depth caused by the site conditions,based on the existing research results and engineering practice experience,a semi-embedded concrete-filled steel tubular column base joint was proposed and designed based on Shenzhen Gangxia North comprehensive transportation hub.To verify the reliability of the joint,the mechanical behavior of the semi-embedded column base under the combined action of axial force,shear force and bending moment was investigated through a 1/5 scale model test coupled with numerical analysis.The stress distribution law inside the column base was analyzed,and the working mechanism was revealed when the annular plates and studs were installed as shear connectors simultaneously.The analysis results show that under the design loads,the axial force of CFST column is mainly transferred through the annular plates and the bottom plate of CFST column,and the bending moment is mainly transferred through the steel tube sidewall pressure;the annular plates can obtain higher force transfer efficiency when embedded shallower,but the concrete underneath is prone to stress concentration;the studs on the steel tube sidewall can provide good shear resistance within the embedded depth.The piles below the pile cap are arranged reasonably.Under the design loads,the pile cap does not tend to occur punching shear damage,and the whole joint is in elastic working state.Under 1.2 times design loads,there is no evident degradation of the joint stiffness,no crushing or spalling of the joint concrete,no visible crack development on the surface,and the steel stress at each key position is lower than the material strength.The semi-embedded column base with annular plates and studs as shear connectors can achieve re

关 键 词：钢管混凝土 半埋入式柱脚 柱脚埋深 环板 模型试验 数值分析 受力性能 

分 类 号：TU398[建筑科学—结构工程]