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strength and deformation of Axially Loaded Fiber-Reinforced Polymer Sheet Confined Concrete Columns

Tsinghua Science and Technology 2004年第2期9卷 130-137页

作者：李静钱稼茹蒋剑彪 Department of Civil Engineering Tsinghua University Beijing 100084 China Beijing Texida Technical Limited Company Beijing 100011 China

Experimental results of 29 axially loaded fiber-reinforced polymer sheet (FS) confined concrete columns and two reference plain concrete columns are introduced. Twenty four column specimens were confined with carbon fiber sheet (CFS) and five column specimens were hybrid confined with both CFS and glass fiber sheet (GFS). The influence of aspect ratio, FS material, initial axial force ratio, and FS confine-ment degree on the strength and deformation of columns were studied. Based on the experimental results, the equations of complete stress-strain curve of CFS confined concrete are proposed. These equations are suitable for the nonlinear analysis of square and rectangular section columns. Suggestions of applying FS to confine concrete columns are presented.

关键词： fiber-reinforced polymer sheet (FS) confined concrete column axial compressive force strength and deformation equation of complete stress-strain curve

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Experimental and numerical study of coal-rock bimaterial composite bodies under triaxial compression

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International Journal of Coal Science & Technology 2021年第5期8卷 908-924页

作者： Yulong Chen Jianping Zuo Dejun Liu Yingjie Li Zhenbo Wang State Key Laboratory of Coal Resources and Safe Mining China University of Mining and TechnologyBeijing 100083China School of Energy and Mining Engineering China University of Mining and TechnologyBeijing 100083China School of Mechanics and Civil Engineering China University of Mining and TechnologyBeijing 100083China

To accurately predict coal burst hazards and estimate the failure of coal pillars in underground coal mining systems,it is of great significance to understand the mechanical behavior of coal-rock bimaterial composite *** paper presents experimental and numerical investigations on the response of rock-coal,coal-rock,and rock-coal-rock bimaterial composite structures under triaxial *** triaxial compression experiments are conducted under confining pressures in the range of 0-20 *** resulting inside fracture networks are detected using X-ray-based computed tomography(CT).The experimentally observed data indicate that the mechanical parameters of the rock-coalrock composites are superior to those of the rock-coal and coal-rock *** compression failure,the coal-rock combination specimens are analyzed via X-ray *** results display that the failure of the coal-rock composite bodies primarily takes place within the ***,the bursting proneness is reduced by increasing confining ***,the corresponding numerical simulations of the experiments are carried out by using the particle flow *** numerical results reveal that coal is vulnerable with regard to energy storage and accumulation.

关键词： Coal-rock bimaterial composite body Triaxial compression strength and deformation X-ray CT Numerical simulation Energy

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Structural Research on Embedment of a Bare Deflated Spiral Case

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Wuhan University Journal of Natural Sciences 2007年第2期12卷 311-316页

作者： WU Hegao SHEN Yan JIANG Kuichao State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan 430072 Hubei China

Complete bearing spiral case has not been applied to large power stations in China so far. The proposal of applying complete bearing spiral case necessitates an analysis of the reliability of the spiral case structure and the security of units under various working conditions. In combination with practice of a project, this paper presents a three-dimensional nonlinear finite element static analysis of the concrete using a concrete smeared crack model by means of the well-known finite element method （FEM） software ABAQUS. The stress distribution of the spiral case and reinforcing bars, the range of damages in surrounding concrete, and the displacement of structure are quantified. The computational results indicate that the embedment method ensures the structure＇s safety in strength. At the same time, the result shows that this embedment is a kind of preponderant method for embedment in aspects of economy and technique of construction, and the application of this embedment method to the hydropower station is feasible provided that some proper engineering measures are taken to constrain the width of the concrete in accord with the code＇s requirements. The paper proves the security and reliability of the structural design of spiral case in hydropower station accordingly.

关键词： hydraulic strength and deformation nonlinear FEM embedment of a bare deflated spiral cases ABAQUS

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