Papers by Author: Le Zhou

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Authors: Le Zhou, Hong Tao Liu
Abstract: To study further mechanical behavior of flexural members of carbon fiber reinforced concrete, this text uses the methods of fiber materials composite principles and balance equations, and derives the elastic modulus of the carbon fiber concrete. The acting principle of carbon fiber in the concrete is analyzed. Based on three bearing stages of carbon fiber reinforced concrete beam, the calculation formulas to flexural bearing capacity of carbon fiber reinforced concrete are given. It is theoretical basis of implication of carbon fibers in civil engineering.
5080
Authors: Xiao Chu Wang, Xiao Xing Liu, Le Zhou, Hong Tao Liu, Min Yang
Abstract: A design idea has been brought forward about SRC beams strengthened with CFRP, in order to solve flexural capacity shortage and need strengthening engineering problems. By analyzing loading process, failure mode and loading mechanism, flexural capacity was calculated by superposition method. According to different failure modes and neutral axis’ location in the steel, the computed formula of flexural capacity about SRC beams strengthened with CFRP was proposed, and it provided references for design of SRC beams strengthened with CFRP.
1154
Authors: Sui Li, Tie Mao Shi, Kai Li, Le Zhou
Abstract: Using GIS technology from ecological security angle it make a quantitative analysis for expansion land ecological factor of study area urban and determine the ecological security rank distribution of urban space. It divides the urban expansion area into four types: core reserve area, buffer reserve area, limiting construct area and appropriate construct area. Respectively formulate different types of development mode and regional ecological restoration strategy.The study results showed that, ecological elements were the most important constraints for future expansion of urban space, Appropriate for the main urban expansion in the region to concentrate in the eastern and the northern part of Nanchong City, delimit a suitable construction area in the expanding area can satisfy the downtown of urban master planning development demand.This method is guaranteed to natural environment based on ecological security,Urban spatial extension to carry on the reasonable planning of the effective measures.
4282
Authors: Xiao Chu Wang, Hong Tao Liu, Le Zhou
Abstract: This text introduced the research results of carbon fiber reinforced concrete beams and columns, and a brief description was presented about the influence of freeze-thaw cycles of carbon fiber reinforced concrete. Based on the experiment and related documents, studies the effects of the different dosage and different lengths of short carbon fiber on the compressive strength of concrete cube test. The results of experiment show the optimum dosage of carbon fiber is 0.24%.The improved compressive strength of carbon fiber reinforced concrete was particularly remarkable. The compressive strength could have a downward trend with the dosage increase. When the lengths of short carbon fiber is 10mm, compared to plain concrete, compressive strength increased 17.7%, and then the compressive strength could have a downward trend with the length increase. When the length of short carbon fiber is 50mm, compressive strength decreased 3%.
259
Authors: Le Zhou, Lian Guang Wang, Sui Li, Hong Tao Liu
Abstract: This paper presents the experimental research on the bending resistance performance of 3 GFRP tube filled with steel-reinforced high-strength concrete flexural members. It studies that the GFRP tube fiber tangle angle, and GFRP tube thickness of GFRP tube filled with steel-reinforced high-strength concrete flexural members have an effect on mechanical performance of this investigation. The experimental results show that the flexural bearing capacity of members obviously increases with the decrease of the fiber tangle angle. The bearing capacity of flexural members increases with the thickness increase of GFRP tube. Based on the test study and theory analysis, a calculation method is proposed, and good agreement with the test results is achieved.
1147
Authors: Le Zhou, Hong Tao Liu
Abstract: For the further study of bearing compressive capacity of GFRP tube filled with SHC(steel-reinforced high-strength concrete)columns subjected to eccentric compression, and analysis its whole bearing compressive process under eccentric compression. Based on the flat section assumption finite strip method, the calculating program of bearing eccentric compressive capacity of GFRP tube filled with SHC columns is proposed according to existing retrofit theory and related technical procedures. The relation curves of load-deformation is gotten using this calculating program, at the same time it can get the effect curves of concrete strength, slenderness ratio, eccentricity and containing bone rate to load-deformation. Calculations show that the ultimate bearing compressive capacity of composite column decreases with the increase of slenderness ratio, and elastic stage of component curve gradually shortens and stiffness gradually loses; The ultimate bearing compressive capacity of composite columns decreases with the increase of eccentricity; component ductility improves; the ultimate bearing compressive capacity of composite columns increases with the increase of concrete strength. The calculated results agree well with the experimental results and this study provides a basis for practical design.
4203
Authors: Le Zhou, Kai Li, Ji Hong Jiang
Abstract: In order to facilitate the actual design of the project, we study force performance of FRP tube steel-reinforced concrete columns under axial load. By five FRP tube steel reinforced concrete structures of axial compression, explore the damage characteristics and the force characteristics of the combination of column, and study parameters on performance of the force combination of column such as FRP tube wall thickness, fiber winding angle and loading mode etc. The capacity of combination column increases with the larger of the FRP tube wall thickness; and increases with the smaller of the FRP fiber winding angle; loaded in different ways lead to different capacities. Using superposition method Study and deduce a more reasonable axial compressive bearing capacity formula of FRP tube steel reinforced concrete structure. Theoretical calculation results match well with experimental results.
1605
Authors: Le Zhou, Lian Guang Wang, Peng Niu, Hong Bin Nie
Abstract: The whole bearing compressive process under eccentric compression is analyzed for the further study of bearing compressive capacity of GFRP tube filled with SHC(steel-reinforced high-strength concrete)columns subjected to eccentric compression. Based on finite strip method from the plane cross-section assumption, the computation program of bearing eccentric compressive capacity of GFRP tube filled with SHC columns is formulated according to the existing retrofit theory and related technical procedures. The relation curves of load-deformation, as well as the effect curves of concrete strength, slenderness ratio, eccentricity and containing bone rate to load-deformation is obtained by means of this calculating program. Calculations show that the ultimate bearing compressive capacity of composite column decreases with the increase of slenderness ratio, elastic stage of component curve gradually shortens and stiffness gradually loses; The ultimate bearing compressive capacity of composite columns decreases with the increase of eccentricity; component ductility improves; the ultimate bearing compressive capacity of composite columns increases with the increase of concrete strength. The calculated results agree well with the experimental results and provides a basis for practical design
1562
Authors: Le Zhou, Hong Tao Liu, Kai Li
Abstract: To investigate further the bearing capacity of flexural members of GFRP(Glass Fiber Reinforced Polymer)SR(steel-reinforced concrete) under symmetric monotonic loading, a full range nonlinear analysis is made. Flexural capacity computing program of GFRP-Reinforced structures is put out, according to structure reinforcing theory and correlative rules through the finite ribbon method based on flat section assumption. The moment-curvature relative curves and the influence curves of the fiber winding angle and pipe wall thickness to load-deformation are obtained by the computer programming. The test specimen’s flexural capacity increases obviously with the increasing of steel ribs models. The slope of curve decreasing in monotonic loading latterly showed that the ductility of component improves. The changes of concrete strength had little effect on initial stiffness and capacity of GFRP SR concrete.
1053
Authors: Le Zhou, Xiao Xing Liu, Ying Li, Dong Yan
Abstract: On the basis of the theory of FRP sheet steel reinforcing concrete beams (SRC-beams), in order to better explore the force performance of FRP (Fiber Reinforce Plastic) steel reinforcing concrete beams, this paper analyzes the stress process simulation of the beam using the computer program of nonlinear analysis. In order to validate the program of the beam section the reliability of the simulation analysis, this paper brings beam section size and its material performance parameters into program and gets different parameters on the bearing capacity of beams influence law. Research shows that when working in the stage of FRP elasticity the reinforcement of FRP layers has little influence on bend curvature figure. In the elastic-plastic stage it has larger influence and the cure increases with the increase of FRP reinforcement layer. It shows that with the increase of the section stiffness beam bending flexural capacity is also bigger.
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