摘要
钢壳混凝土沉管隧道中抗剪连接件结构体系的设置是隧道建设施工的关键技术问题。依托深中通道项目,采用试验和数值分析相结合研究方法考虑抗剪连接件脱空、受力状态、开孔参数对钢-混凝土连接性能的影响,得到三因素影响下剪力-滑移曲线的差异以及连接件承载力、刚度以及腹板曲率的变化规律;通过有限元模型对脱空与非脱空连接件进行数值计算,分析混凝土压力、拉压应力变化和剪应力变化的规律,得到3种模型下脱空与非脱空承载力和刚度的衰减特征;基于脱空、受力状态和开孔的影响,建立了考虑三因素影响的抗剪连接件承载力计算方法,并由试验结果验证其可靠性。研究结果为深中通道钢壳混凝土沉管结构合理选择连接件奠定了基础。
The setting of shear connector structure system in immersed tunnel is a key technical problem in tunnel construction.Based on the Shenzhen-Zhongshan Link project,in this paper by combining experimental and numerical analysis,the effects of shear connector void,stress state,and opening parameters on the performance of steel-concrete connections are considered,and the differences of shear slip curves under the influence of three factors,as well as the changes in the bearing capacity and stiffness of connectors are obtained.Through the numerical calculation of void and non void connectors by finite element method,the laws of concrete pressure,tensile and compressive stress changes and shear stress changes are analyzed,and the attenuation characteristics of void and non void bearing capacity and stiffness under the three models are obtained.Based on the influence of void,stress state and opening,a calculation method of shear connector bearing capacity considering the influence of three factors is established,and its reliability is verified by the test results.The research results lay a foundation for the reasonable selection of immersed tube structural connectors for the Shenzhen-Zhongshan Link project.
作者
姬海
宋神友
徐国平
黄清飞
邓斌
JI Hai;SONG Shen-you;XU Guo-ping;HUANG Qing-fei;DENG Bin(CCCC Highway Consultants Co.,Ltd,Beijing 100010,China;Tsinghua University,Beijing 100084,China;Shenzhong Link Management Center,Zhongshan 528451,China)
出处
《公路》
北大核心
2023年第9期427-438,共12页
Highway
基金
广东省重点领域研发计划项目,项目编号2019B111105002。
关键词
沉管隧道
钢壳混凝土结构
抗剪连接
连接型式
破坏形式
抗剪承载力
immersed tunnel
steel shell concrete structure
shear connection
connection type
damage form
shear capacity
