Theoretical study on the confine-stiffening effect and fractal cracking of square concrete filled steel tubes in tension loads

作     者：Meng ZHOU Jiaji WANG Jianguo NIE Qingrui YUE Meng ZHOU;Jiaji WANG;Jianguo NIE;Qingrui YUE

作者机构：Central Research Institute of Building and Construction Co.Ltd.MCCBeijing 100088China Department of Civil EngineeringTsinghua UniversityBeijing 100086China Zhuhai Institute of Civil Construction-Safety Research Co.Ltd.Zhuhai 519000China Department of Civil and Environmental EngineeringUniversity of HoustonHoustonTX 77054US 

出 版 物：《Frontiers of Structural and Civil Engineering》 (结构与土木工程前沿（英文版）)

年 卷 期：2021年第15卷第6期

页      面：1317-1336页

核心收录：

学科分类：08[工学] 081304[工学-建筑技术科学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0813[工学-建筑学] 

基　　金：The writers gratefully acknowledge the financial support provided by the National Natural Science Foundation of China(Grant No.51878018).The first author(Meng Zhou)gratefully acknowledges the support provided by Tsinghua Innovation Center in Zhuhai and Zhuhai Institute of Civil Construction-Safety Research Co. Ltd 

主　　题：square concrete filled tubes confine-stiffening confine-strengthening fractal cracking fracture 

摘      要：Tension stress in steel-concrete composite is widely observed in engineering *** on an experimental program on tension performance of three square concrete-filled tubes(SCFT),the tension theory of SCFT is proposed using a mechanics-based *** tension stiffening effect,the confining strengthening effect and the confining stiffening effect,observed in tests of SCFTs are included in the developed tension theory ***,simplified constitutive models of steel and concrete are proposed for the axial tension performance of *** on the *** software,a special fiber beam-column element is proposed to include the confining effect of SCFTs under tension and *** proposed analytical theory,effective formulas,and equivalent constitutive laws are extensively verified against three available tests reported in the literature on both global level(e.g.,load-displacement curves)and strain *** experimental verification proves the accuracy of the proposed theory and formulations in simulating the performance of SCFT members under tension with the capability to accurately predict the tensile strength and stiffness enhancements and realistically simulate the fractal cracking phenomenon.