Residual Capacity of Friction⁃Type High⁃Strength Bolted T⁃stub Connection with Nut Corrosion Damage  

作　　者：Gangnian Xu Baoyao Lin Yefeng Du 

机构地区：[1]School of Civil Engineering,Shandong Jiaotong University,Jinan 250357,China [2]China Academy of Transportation Sciences,Beijing 100081,China [3]School of Civil Engineering,Shandong University,Jinan 250061,China

出　　处：《Journal of Harbin Institute of Technology(New Series)》2023年第3期68-84,共17页哈尔滨工业大学学报（英文版）

摘　　要：Corrosion is a primary cause of the slippage of friction⁃type high⁃strength bolted(FHSB)T⁃stub connections.This paper attempts to quantify the residual capacity of FHSB T⁃stub connections with corroded nuts.Firstly,corrosion simulation tests were conducted on 48 manually cut nuts to find out the relationship between the damage degree of nut section and the residual clamping force(RCF)of bolt.Then,static load tests were carried out on 24 FHSB T⁃stub connections with nuts of different degrees of damage to obtain the failure modes.By finite⁃element(FE)models,a comparative analysis was performed on the initial friction load(IFL)and ultimate strength(US)of each connection with corroded nuts.Finally,the parameters of 96 FE models for FHSB T⁃stub connections were analyzed and used to derive the calculation formulas for the degree of damage for each nut and the IFL and US of each connection.The results show that the RCF decay of a bolt is a quadratic function of the equivalent radius loss ratio and the shear failure after nut corrosion;the IFL of each connection had a clear linear correlation with the RCF of the corresponding bolts,and the correlation depends on the applied load and static friction on connecting plate interface induced by the clamping force;the static friction had little impact on the US of the connection;the proposed IFL and US formulas can effectively derive the residual anti⁃slip capacity of FHSB T⁃stub connections from the degree of damage of the corroded nut section.The research results provide a scientific basis for the replacement and maintenance of corroded bolts of FHSB T⁃stub connections.

关 键 词：nut corrosion T⁃stub connection high⁃strength bolt sectional damage residual clamping force(RCF) anti⁃slip capacity 

分 类 号：U443.35[建筑科学—桥梁与隧道工程] U445.72[交通运输工程—道路与铁道工程]