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Expansive Behaviors of self-stressing Concrete under Different Restraining Conditions

Journal of Wuhan University of Technology(Materials Science) 2011年第4期26卷 780-785页

作者：常旭 College of Civil Engineering Henan Polytechnic University

The expansive behaviors of the expensive concrete under different restraining conditions were systemically studied. The experimental results indicate that expansive deformation obviously increases before 10 days and tends to be constant after 25 days regardless of the restraining conditions. The mixture ratio of expansive cement and restraining conditions are the main factors affecting expansive deformation. self-stress can be obtained when the expansive deformation is restrained. The higher self-stress could be obtained when the expensive concrete is restrained by steel tube. For specimens under steel tube restraining, the wall thickness and the length of the steel tube have important influence on self-stress. Both the radial self-stress and axial self-stress in concrete core increase when wall thickness or length of the steel tube increases.

关键词： self-stress expansive concrete restraining condition

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Expansion performance and self-stressing behavior of CFST columns considering concrete creep and shrinkage effect

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Journal of Southeast University(English Edition) 2021年第1期37卷 52-58页

作者： Xu Li Zeng Hao Pan Jinlong School of Civil Engineering Southeast UniversityNanjing 210096China

Expansive concrete is used in the steel tube of Concrete-filled steel tubular(CFST)columns to solve the problem of steel-to-concrete ***-stress is generated between concrete and steel plate due to concrete expansion,which can effectively improve the mechanical performance of CFST *** tests were conducted on concrete and CFST columns,*** free deformation of concrete and circumferential deformation of steel tubes were measured and analyzed.A calculation method was proposed to evaluate the hoop strain,self-stress and creep deformation of the CFST *** test and calculation results indicate that the proper addition of expansion agent in the internal concrete can keep concrete expansive and generate self-stresses for a long *** expansion and self-stresses prevent the debonding between the steel tube and the internal *** the dosage of expansive agents and reducing the curing age both increase the expansive deformation and self-stress of CFST *** the tube thickness reduces the expansive deformation and increases the initial self-stress of CFST columns.

关键词： concrete-filled steel tubular(CFST) expansive deformation self-stress creep

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Mechanical behavior of a shelter system based on cable-strut structures

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2012年第12期13卷 895-903页

作者： Jian-guo CAI1,2,Ya ZHOU1,Jian FENG1,2,Yi-xiang XU3 (1Key Laboratory of C&PC Structures of Ministry of Education,Southeast University,Nanjing 210096,China) (2National Prestress Engineering Research Center,Southeast University,Nanjing 210096,China) (3Department of Civil Engineering,Strathclyde University,Glasgow,UK) Key Laboratory of C&PC Structures of Ministry of Education Southeast University Nanjing China National Prestress Engineering Research Center Southeast University Nanjing China Department of Civil Engineering Strathclyde University Glasgow UK

A shelter system based on cable-strut structures,consisting of compressive struts and high-tensile elements,is described in this *** deployment of the shelter is achieved by tightening inclined *** cables are used to terminate the *** state of self-stress of the cable-strut structures in the fully deployed configuration is given,and the minimum strut length and the maximum load design of the shelter are *** mechanical behavior of the system was studied under symmetrical and asymmetrical load *** results show that the shelter in the deployed configuration satisfies the ultimate limit and the serviceability limit state ***,the stability of the cable-strut system is investigated,considering the effect of imperfections on the buckling of the *** conclude that the influence of imperfections based on the consistent imperfection mode method is not significant.

关键词： Foldable structures Cable-strut structures Mechanical behavior self-stress Stability

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