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stress-strain relationship of recycled self-compacting concrete filled steel tubular column subjected to eccentric compression

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Frontiers of Structural and Civil Engineering 2020年第3期14卷 760-772页

作者： Feng YU Cheng QIN Shilong WANG Junjie JIANG Yuan FANG College of Civil Engineering Anhui University of TechnologyMa'anshan 243002China

As a typical compression member,the concrete-filled steel tube has been widely used in civil engineering ***,little research on recycled self-compacting concrete flled circular steel tubular(RSCCFCST)columns subjected to eccentric load was *** this study,21 specimens were designed and experimental studies on the stress-strain relationship of were carried out to study the mechanical *** coarse aggregate replacement ratio,concrete strength grade,length to diameter ratio and eccentric distance of specimens were considered as the main experimental parameters to carry out eccentric compression *** corresponding stress-strain relationship curves were used to analyze the influence of concerned parameters on ecentric load-bearing capacity of RSCCFCST *** experimental results show that the strain of the eccentric compression stress-strain curves increase with the increase of recycled coarse aggregate replacement ratio and concrete strength *** increase of eccentric distance,the ductility of specimens increases while the bearing capacity ***,a phenomenological model of RSCCFCST columns is proposed,which exhibits versatile ability to capture the process during *** present study is expected to further understanding the behaviors and to provide guidance of RSCCFCST columns in design and engineering applications.

关键词： concrete flleld circular steel tubular columns recycled self-compacting concrete eccentric compression recycled coarse aggregate replacement ratio stress-strain relationship

stress-strain relationship of unsaturated cohesive soil

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Journal of Central South University 2010年第3期17卷 653-657页

作者：梅国雄陈启明姜朋明 School of Civil Engineering and Architecture Jiangsu University of Science and Technology Louisiana Transportation Research Center Louisi ana State University

A moisture-content based constitutive model was proposed based on the hyperbolic model as an attempt to move towards the implementation of unsaturated soil mechanics into routine geotechnical engineering practice. The stress-strain behavior of in-situ soil at a depth of 5 m was investigated by conducting undrained triaxial compression tests using the remolded soil samples. The test results show that the stress-strain relationship of unsaturated cohesive soil is still hyperbolic. The values of parameters a and b given in the model decrease with increasing the confining pressure for soil samples with the same moisture content and increase with increasing the moisture content for soil samples under the same confining pressure. The relationships between parameters a, b and moisture content were studied for confining pressures of 100, 150, 200 and 250 kPa. The comparison between the measured and predicted stress-strain curves for an additional group of soil samples, having a moisture content of 25.4%, shows that the proposed moisture content-dependent hyperbolic model provides a good prediction of stress-strain behavior of unsaturated cohesive soil.

关键词： unsaturated cohesive soil moisture content triaxial compression test stress-strain relationship

Influence of freeze-thaw damage gradient on stress-strain relationship of stressed concrete

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Frontiers of Structural and Civil Engineering 2023年第9期17卷 1326-1340页

作者： Xiguang LIU Yongjie LEI Yihao SUN Jiali ZHOU Ditao NIU College of Civil Engineering Xi’an University of Architecture&TechnologyXi’an 710055China Institute for Interdisciplinary Innovation Research Xi’an 710055China Shaanxi Construction Engineering Group Co. Ltd.Xi’an 710055China XAUAT Engineering Technology Co.Ltd.Xi’an 710055China

Freeze-thaw damage gradients lead to non-uniform degradation of concrete mechanical properties at different depths.A study was conducted on the stress-strain relationship of stressed concrete with focus on the freeze-thaw damage *** effects of relative freeze-thaw depths,number of freeze-thaw cycles(FTCs)and stress ratios on the stress-strain curves of concrete were *** test results demonstrated that freeze-thaw damage was more severe in the surface layers of concrete than in the deeper *** relative peak stress and strain of concrete degraded bilinearly with increasing *** stress-strain relationship of stressed concrete under FTC was established,and it was found to agree with the experimental results.

关键词： freeze-thaw damage stress ratios stress-strain relationship damage variable

Nonlinear model characterizing stress-strain relationship and permeability change of contact compression fracture at closing stage

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Journal of Rock Mechanics and Geotechnical Engineering 2016年第6期8卷 896-903页

作者： Jianping Zuo Guanghui Jiang Haicheng Su Yan Chen School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing100083China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyBeijing100083China

Understanding the stress-strain relationship and permeability change for contact compression fracture at closing stage has been a hot issue for a long *** investigations of this topic were mainly focused on experimental tests;however,theoretical approaches were rarely *** on this,this paper focuses on the contact fracture at closing stage when rock is uniaxially loaded,and then a theoretical model is *** on the change of fracture elasticity modulus,it shows that as crack apertures are gradually reduced in the loading process,the permeability of rock sample will decrease *** scenario shows that theoretical computation matches well with the experimental ***,the effects of ratio of sample size to fracture aperture(n).pore pressure(P),and initial aperture(b) on stress-strain relationship and permeability change for contact compression fracture at closing stage are analyzed.

关键词： Uniaxial loading Closing stage Permeability change stress-strain relationship

stress-strain relationship and Failure Criterion for Concrete after Freezing and Thawing Cycles

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Journal of Southwest Jiaotong University(English Edition) 2006年第3期14卷 265-271页

作者：罗昕卫军 School of Civil Engineering and Mechanics Huazhong University of Science and Technology Wuhan 430074 China

The research of the failure criterion and one-dimensional stress-strain relationship of deteriorated concrete were carried out. Based on the damage mechanics theory, the dsmage which reflects the alternation of internal state of material were introduced into the formula presented by Desayi and Krishman and the weighted twin-shear strength theory. As a nondestructive examination method in common use, the ultrasonic technique was adopted in the study, and the ultrasonic velocity was used to establish the damage variable. After that, the failure criterion and one-dimensional stress-strain relationship for deteriorated concrete were obtained. Eventually, tests were carried out to study the evolution laws on the damage. The results show that the more freezing and thawing cycles are, the more apparently the failure surface shrinks. Meanwhile, the comparison between theoretical data and experimental data verifies tile rationality of tile damage-based one-dimensional stress-strain relationship proposed.

关键词： Concrete Damage stress-strain relationship Strength theory Freezing and thawing cycles Supersonic velocity

Effect of Engineering Character on stress-strain relationship in Post-Peak Area

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Journal of China University of Mining and Technology 2003年第2期13卷 170-173页

作者：汤雷柯敏勇鄢建华 Nanjing Hydraulic Research Institute NanjingJiangsu 210O24China Nanjing Hydraulic Research Institute Nanjingjiangsu 210024China

Constitutive experiments are the base of all rock mechanics works. The effect of engineering character on constitutive law is a new problem of rock mechanics. The results of series specimens based on the uniaxial and plane strain compression experiments were presented and discussed. It is found that engineering or experiment character has obvious effects on stress-strain relationship and especially on mechanic parameters in post-peak area. And the law of size effect of softening materials was also discussed.

关键词： engineering style experiment style stress-strain relationship mechanic parameters

A novel binary effective medium model to describe the prepeak stressstrain relationship of combined bodies of rock-like material and rock

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International Journal of Mining Science and Technology 2023年第5期33卷 601-616页

作者： Tienan Wang Yue Zhai Huan Gao Yubai Li Ruifeng Zhao School of Geological Engineering and Geomatics Chang’an UniversityXi’an 710064China Key Laboratory of Mine Geological Disaster Hazard Mechanism and Control Ministry of Natural ResourcesXi’an 710064China

Combined bodies of rock-like material and rock are widely encountered in geotechnical engineering,such as tunnels and *** existing theoretical models describing the stress-strain relationship of a combined body lack a binary *** on effective medium theory,this paper presents the governing equation of the“elastic modulus”for combined and single bodies under triaxial compressive tests.A binary effective medium model is then *** on the compressive experiment of concretegranite combined bodies,the feasibility of determining the stress threshold based on crack axial strain is discussed,and the model is *** model is further extended to coal-rock combined bodies of more diverse types,and the variation laws of the compressive mechanical parameters are then *** results show that the fitting accuracy of the model with the experimental curves of the concretegranite combined bodies and various types of coal-rock combined bodies are over 95%.The crack axial strain method can replace the crack volumetric strain method,which clarifies the physical meanings of the model *** variation laws of matrix parameters and crack parameters are discussed in depth and are expected to be more widely used in geotechnical engineering.

关键词： Combined body stress-strain relationship Hooke’s law Effective medium theory stress threshold determination

An experimental study on stress-strain behavior and constitutive model of hardfill material

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Science China(Physics,Mechanics & Astronomy) 2011年第11期54卷 2015-2024页

作者： WU MengXi DU Bin YAO YuanCheng HE XianFeng Key Laboratory of Environmental Mechanics Institute of Mechanics Chinese Academy of Sciences Beijing 100190 China Guiyang Hydropower Investigation Design ＆ Research Institute CHECC Guiyang 550081 China Yellow River Institute of Hydraulic Research Zhengzhou 450003 China

Hardfill is a new type of artificially cemented material for dam construction works,with a wide application *** mechanical behavior lies between concrete and rockfill materials.A series of large-scale triaxial tests are performed on hardfill specimens at different ages,and the stress-strain behavior of hardfill is further *** strength and stress-strain relationship of hardfill materials show both frictional mechanism and cohesive *** age-related constitutive model of hardfill is developed,which is a parallel model consisting of two components,rockfill component and cementation ***,a comparison is made between the simulated and the experimental results,which shows that the parallel model can reflect the mechanical characteristics of both rockfill-like nonlinearity and concrete-like age *** addition,a simplified method for the determination of parameters is proposed.

关键词： hardfill stress-strain relationship large-scale triaxial tests constitutive model

THE NONLINEAR MAGNETOELASTIC PROPERTIES OF <110> ORIENTED TB_(0.27)DY_(0.73)FE_(1.95) POLYCRYSTALLINE ALLOYS UNDER COUPLED MAGNETOMECHANICAL LOADING

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Acta Mechanica Solida Sinica 2013年第5期26卷 441-447页

作者： Pei Zhao Youhe Zhou Yirui Liang Key Laboratory of Mechanics on Environment and Disaster in Western China The Ministry of Education of China and Department of Mechanics and Engineering Sciences School of Civil Engineering and MechanicsLanzhou University

In the paper, the nonlinear magnetoelastic properties of composition Tb0.27Dy0.73 Fel.95 〈 110 〉 oriented polycrystalline alloys are investigated under coupled loads of high mag- netic field and compressive stress. The magnetization and magnetostriction are measured simul- taneously under applied magnetic field from -800 to 800 kA/m and compressive stress from 0 to 25 MPa at room temperature. The strain coefficient and relative permeability are obtained by differential calculation from the experimental curves. The results show that the values of satura- tion magnetization （M~） under different compressive stresses remain invariably constant in the region of the high magnetic field. The saturation magnetostriction （As） increases with increasing compressive stress and reaches 1680 ~ 10-6 under 25 MPa. According to the increase of the com- pressive stress, the hysteretic loop area of magnetization and magnetostriction increases, while the maximum relative permeability and strain coefficient decrease. Additionally, the influence of the bias magnetic field on the mechanical property is taken into account. The stress-strain relation- ship is nonlinear and sensitive to the applied external magnetic fields along the axis of rod. The results obtained are a useful complement to the existing experiments for theoretical approaches and engineering applications.

关键词： TbDyFe alloys magnetomechanical loading magnetization magnetostriction stress-strain relationship