钢-钢抱箍的界面力学行为及承载力研究  

Study on Interface Mechanical Behavior and Bearing Capacity of Steel-Steel Hoop

作　　者：李钢 范世磊 张杰 董星 王德双 LI Gang;FAN Shilei;ZHANG Jie;DONG Xing;WANG Deshuang(China Railway 12th Bureau Group Co,LTD,Taiyuan 030024,China;Anhui Xiandai Transport&Design Institute Co,LTD,Hefei 230041,China)

机构地区：[1]中铁十二局集团有限公司,山西太原030024 [2]安徽省现代交通设计研究院有限责任公司,安徽合肥230041

出　　处：《土木工程与管理学报》2024年第2期31-40,54,共11页Journal of Civil Engineering and Management

基　　金：中铁十二局集团有限公司课题(QT054)。

摘　　要：钢抱箍常被用于施工支架和顶升工程中,为了解钢抱箍与被箍构件界面之间的摩擦和滑移性能,分析钢抱箍的承载力及其主要影响因素,开展了3组10个钢抱箍试件试验研究。基于验证的数值模型,深入研究了螺栓预紧力、抱箍与被箍钢管界面设置橡胶垫层与否、抱箍尺寸3个主要因素影响下的被箍钢管表面剪应力分布、界面相对滑移与摩擦应力关系、抱箍承载力-预紧力变化规律及抱箍破坏模态。提出了钢抱箍承载力理论计算公式,分析了界面摩擦应力与滑移之间的规律。结果表明:螺栓预紧力是左右抱箍承载力的重要因素,抱箍承载力随螺栓预紧力增大呈线性提高;界面橡胶垫层降低了抱箍与被箍构件界面剪切刚度和抱箍承载力,提高了极限破坏时的界面滑移值;在同等条件下,钢抱箍的尺寸变化主要是改变了界面剪应力,对钢抱箍整体承载力影响甚微。Steel hoops are often used in construction supports and jacking works.In order to understand the friction and slip properties of the interface between the steel hoop and the hooped component,analyze the bearing capacity of the steel hoop and its main influencing factors,the experimental study of 3 groups including 10 steel hoop specimens was conducted.Combining with the verified numerical model,the distribution of shear stress on the surface of hooped steel pipe,the relationship between relative interface slip and friction stress,the law of bearing capacity of steel hoops changing with pretightening force of bolts,and the hoop failure mode were deeply studied by the 3 main influence factors,including different pretightening forces of bolts,whether rubber cushion is set at the interface between the hoop and the hooped steel pipe,and changing hoop size.The theoretical formula of bearing capacity of the steel hoop and the law between interface friction stress and slip are put forward.The results indicate that pretightening force of bolt is an important factor to control the bearing capacity of the hoop.The hoop bearing capacity increases linearly with the increase of pretightening force of bolt.The shear rigidity of interface and the bearing capacity of the hoops are reduced by the interfacial rubber cushion,but the value of interface slip increases during the limit failure is improved.Under the same conditions,shear stress of interface is mainly changed owing to the size change of the steel hoop,which not nearly influenced the overall bearing capacity of steel hoop.

关 键 词：钢抱箍 承载力 界面剪切刚度 界面滑移 螺栓预紧力 摩擦应力 

分 类 号：U445.46[建筑科学—桥梁与隧道工程]