混合梁斜拉桥开口格室结合部承载性能试验研究  

Experimental Study on Bearing Properties of the Composite Joint with Opened Cell Used in Hybrid Girder Cable-Stayed Bridges

作　　者：王太奇 王淑敏 马广 杨欣然 刘玉擎[1] WANG Taiqi;WANG Shumin;MA Guang;YANG Xinran;LIU Yuqing(College of Civil Engineering,Tongji University,Shanghai 200092,China;China Railway Design Corporation,Tianjin 300308,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]中国铁路设计集团有限公司,天津300308

出　　处：《建筑钢结构进展》2025年第3期32-37,45,共7页Progress in Steel Building Structures

摘　　要：为明确开口格室混合梁钢混结合部的承载性能,基于在建广湛高铁东平水道混合梁斜拉桥结合部构造,设计两个开口格室结合部局部缩尺试件,开展了轴压承载力试验。分析了开口格室结合部的破坏模态、钢底板与混凝土之间的相对滑移、应变分布,对比了钢底板分别采用焊钉和槽口型开孔板连接件对承载性能的影响。结果表明:两试件的承载力约为实桥设计荷载的6.8倍。钢底板上采用焊钉的试件的承载力比采用槽口型开孔板的高约6%,两试件的破坏模态均为混凝土受压破坏,剪力连接件均未被剪断,连接件类型对结合部的承载力和破坏模态影响不显著;两试件承压板附近混凝土在加载过程中未因局部承压而压碎,试件破坏时钢底板仍处于弹性受力状态。槽口型开口板连接件可增强钢底板与混凝土之间的结合性能。To investigate the load-bearing capability of an opened cell steel-concrete composite joint,two reduced-scaled composite joints were specially designed based on the steel-concrete composite joint of Dongping hybrid cable-stayed bridge in the Guangzhan high-speed railway and subjected to axial compression capacity tests.The failure mode,relative slip curve between steel bottom plate and concrete,and strain distribution were explored,and the influence of using stud and notched perfobond connector on the bearing capacity of steel bottom plate was compared.The results show that the bearing capacity of the specimen is about 6.8 times that of the actual bridge design.The specimen using stud on the steel bottom plate is about 6%higher than that of the specimen using notched perfobond connector.Notably,the failure mode of both specimens is predominantly characterized by compression failure of concrete,with the connectors not being sheared off,indicating that the influence of connector type on the bearing capacity and failure mode of the joint is not significant.The concrete near the bearing plate of the two specimens was not crushed due to local pressure during the loading process,and the steel bottom plate was still in an elastic stage when the specimens were damaged.The notched perfobond connector can enhance the bonding performance between the steel bottom plate and concrete.WANG Taiqi1,WANG Shumin2,MA Guang2,YANG Xinran2,LIU Yuqing1(1.College of Civil Engineering,Tongji University,Shanghai 200092,China;2.China Railway Design Corporation,Tianjin 300308,China)

关 键 词：混合梁斜拉桥 开口格室结合部 焊钉 槽口型开孔板 承载性能 

分 类 号：U446.1[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]