Development of component stiffness equations for thread-fixed one-side bolt connections to an enclosed rectangular hollow section column under tension  

作　　者：Fu-Wei WU Yuan-Qi LI 

机构地区：[1]Department of Structural Engineering,Tongji University,Shanghai 200092,China [2]State Key Laboratory of Disaster Reduction in Civil Engineering,Tongji University,Shanghai 200092,China

出　　处：《Frontiers of Structural and Civil Engineering》2024年第4期568-586,共19页结构与土木工程前沿（英文版）

基　　金：This study was supported by the National Natural Science Foundation of China(Grant Nos.51978500 and 51538002).

摘　　要：The derivation and validation of analytical equations for predicting the tensile initial stiffness of threadfixed one-side bolts(TOBs),connected to enclosed rectangular hollow section(RHS)columns,is presented in this paper.Two unknown stiffness components are considered:the TOBs connection and the enclosed RHS face.First,the trapezoidal thread of TOB,as an equivalent cantilevered beam subjected to uniformly distributed loads,is analyzed to determine the associated deformations.Based on the findings,the thread-shank serial-parallel stiffness model of TOB connection is proposed.For analysis of the tensile stiffness of the enclosed RHS face due to two bolt forces,the four sidewalls are treated as rotation constraints,thus reducing the problem to a two-dimensional plate analysis.According to the load superposition method,the deflection of the face plate is resolved into three components under various boundary and load conditions.Referring to the plate deflection theory of Timoshenko,the analytical solutions for the three deflections are derived in terms of the variables of bolt spacing,RHS thickness,height to width ratio,etc.Finally,the validity of the above stiffness equations is verified by a series of finite element(FE)models of T-stub substructures.The proposed component stiffness equations are an effective supplement to the component-based method.

关 键 词：initial stiffness component based method thread-fixed one-side bolt rectangular hollow sections analytical equation 

分 类 号：TU37[建筑科学—结构工程]