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3rd International Conference on Advanced Design and Manufacturing engineering (ADME 2013)

作者： Li, Shanqing Yuan, Hong Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037858431

The quasi-Green function method(QGFM) is applied to solve the free vibration of clamped orthotropic thin plates with parallelogram boundary shape on Winkler foundation. Firstly the model governing differential equation of the problem is reduced to the boundary value problem of the biharmonic operator, and then it is reduced to the Fredholm integral equation of the second kind by Green's formula. A quasi-Green function is established by using the fundamental solution and the boundary equation of the problem. This function satisfies the homogeneous boundary condition of the problem. The singularity of the kernel of the integral equation is overcome by choosing a suitable form of the normalized boundary equation. The comparison with ANSYS finite element solution shows a good agreement. The proposed method is a novel and effective mathematical one.

关键词： Green's function integral equation R-function Winkler foundation free vibration of orthotropic plate

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Numerical Simulation for Surface Displacement of Shield Tunnel Construction under Building Load

Numerical Simulation for Surface Displacement of Shield Tunn...

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2nd International Conference on Civil, Architectural and Hydraulic engineering (ICCAHE 2013)

作者： Zhan, Huiting Yuan, Hong Wu, Jiayu Yuan, Yusen Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037858578

The tunnel construction causes deformation, even damage of the nearby buildings and other types of structures. Using 3d finite element method can simulate the process of shield tunneling construction. The paper studies the influence of different building load on the deformation of soil, when considering different excavation steps in the process of tunnel construction. The results show that the building load has important influence on the surface displacement during the construction of tunnel. With the advancement of excavation, sedimentation tank will move forward and become larger. By the influence of jacking force, the soil and rock in front of tunnel face moves forward and upward, thus forming the surface uplift.

关键词： shield tunnel building load surface displacement 3d finite element method

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Unloading behavior study on FRP-concrete interface under an exponential softening law

Unloading behavior study on FRP-concrete interface under an ...

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International Forum on Mechanial and Material engineering (IFMME 2013)

作者： Liu, Sanxing Yuan, Hong Han, Jun Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037858004

Loading behavior studies on FRP-concrete interface are refined enough. Because of the complexity of the problem, there exist relatively few unloading behavior studies. Occurrence mechanism of unloading needs to be clarified. Through a combination of theory and finite element method, this paper studied the unloading behavior involved in interfacial failure process under an exponential softening law, clarified when and where unloading occurred and estimated the effect of unloading.

关键词： exponential softening law FRP concrete interface unloading

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An extension of Karman-Donnell's theory for non-shallow, long cylindrical shells undergoing large deflection

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EUROPEAN JOURNAL OF MECHANICS A-SOLIDS 2013年 37卷 329-335页

作者： Xue, Jianghong Yuan, Ding Han, Feng Liu, Renhuai Jinan Univ Dept Mech & Civil Engn Key Lab Disaster Forecast & Control Engn Minist Educ Guangzhou 510632 Guangdong Peoples R China Beijing Inst Technol State Key Lab Explos Sci & Technol Beijing 100081 Peoples R China

Conventionally cylindrical shells are often treated as shallow shells whose governing equation, according to Karman-Donnell's theory, can be approximated by those of thin plates. In this paper Karman-Donnell's theory for shallow shells is extended for long cylindrical shells undergoing large, nonlinear flexural deflection. The kinematic relations between the changes of curvature and the displacement are derived and the governing equations are established by considering the influence of the initial curvature of the cylindrical shells. In particular, the extended Karman-Donnell's theory is applied for the failure analysis of infinitely cylindrical shell under lateral pressure. A regional collapse mode is identified to occur in the shell with a longitudinal span proportional to (radius(3)/thickness)((1/2)) and a transverse profile of dog bone shape. It is found that the buckling pressure of the shell is in proportion to (thickness/radius)(3) and converges to the classic solution given by Timoshenko and Gere (1961). A comparison to the previous works indicates that ignoring the effect of the initial curvature will result in an overestimate of the buckling pressure for 33%. It shows that the initial curvature of long cylindrical shells has significant influence on the load carrying capacity and the extended Karman-Donnell's equations give very accurate predictions. (C) 2012 Elsevier Masson SAS. All rights reserved.

关键词： Regional collapse Nonlinear analysis Non-shallow Cylindrical shell Buckle propagation

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A Numerical Study of the Impact of Tunnel Depth on Surface Displacement in Shield Tunnel Construction

A Numerical Study of the Impact of Tunnel Depth on Surface D...

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3rd International Conference on Applied Mechanics, Materials and Manufacturing (ICAMMM 2013)

作者： Zhan, Huiting Yuan, Hong Wu, Jiayu Yuan, Yusen Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037858882

Using 3d finite element method can simulate the process of shield tunnel construction. The paper studies the impact of different tunnel depth on the deformation of soil, when considering different excavation steps in the process of tunnel construction. The results show that the shallower the tunnel depth, and the greater the amount of the surface displacement during the tunnel construction. In the process of the tunnel excavation, the soil surface displacement in front of the shield machine is the result of superposition of the uplift and subsidence. When the tunnel depth increases, the surface displacement curve becomes smoother, and the rate of change becomes slower.

关键词： shield tunnel tunnel depth surface displacement 3d finite element method

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Application of the R-function theory and variational method for torsion problem with complicated cross-section

Application of the R-function theory and variational method ...

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3rd International Conference on Civil engineering, Architecture and Building Materials (CEABM 2013)

作者： Li, Shanqing Yuan, Hong Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037857755

The R-function theory and variational method are employed to solve the torsion problem of the bar with a complicated cross-section. When the variational method is used to solve the elastic torsion problem alone, the stress function can be set to meet the boundary condition, only with the simple cross-section such as the rectangle and ellipse. For the complicated cross-section, it is hard to find a stress function to meet the boundary condition. The R-function theory can solve the problem, and it can be used to describe the complicated cross-section by implicit function form. Introducing the R-function theory can be easy to construct the stress function that satisfied the boundary of the complicated cross-section. A numerical example demonstrates the feasibility and efficiency of the present method.

关键词： R-function theory variational method bar with complicated cross-section torsion problem

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A New Steel Beam Configuration Method of Long-term deflection control of Long-span PC beam bridge

A New Steel Beam Configuration Method of Long-term deflectio...

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3rd International Conference on Civil engineering, Architecture and Building Materials (CEABM 2013)

作者： Xue, Xingwei Yuan, Hong Li, Shanqing Jinan Univ Inst Appl Mech MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037857779

For solving the big deflection problem which is cause by the far cantilever segment of dead load zero bending moment method, analyzing the composition process of dead load and prestress bending moment, and this paper presents the improvement of dead load zero bending moment *** improved method adopts the prestress in principle: far segment more and close segment litter, which not only can insure the prestress bending moment bigger than dead load zero bending moment in all over the cantilever constructing stage, but also can control the deflection well. The improved method is applied to a PC continuous bridge which has a main span of 168 metres, the deflection decreases 24.4% to that of the original design.

关键词： dead load zero bending moment method long-span PC beam bridge deflection control

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Effective elastic moduli of fiber-reinforced polymer matrix composites filled with nano-particle

Effective elastic moduli of fiber-reinforced polymer matrix ...

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2nd International Conference on Mechanical Properties of Materials and Information Technology, ICMPMIT 2013

作者： Zhang, Hui Zhang, Zong Fu Xu, Jia Chu Department of Mechanics and Civil Engineering Jinan University Guangzhou 510632 China Key Lab of Disaster Forecast and Control in Engineering Ministry of Education Jinan University Guangzhou China

ISBN: (纸本)9783037858608

Effective moduli of fiber-reinforced polymer matrix composites filled with nano-particle considering the effect of linear change of interphase are presented in this paper. The three-phase inclusion problem for matrix-interface-particle is equivalent to the Eshelby two-phase inclusion problem. According to the result of the Eshelby inclusion problem, the effective modulus tensor of unit cell of equivalent particle is derived. The effective moduli of equivalent matrix are given based on Mori-Tanaka method. Using two fundamental equation of micromechanic theory, the three-dimensional bridged formulation of unidirectional composites is derived. The quantitative relationship between the macroscopic elastic parameters and the structural parameters of the fiber-reinforced polymer composites filled with nano-particles is investigated. Effects of the thickness of interfacial layer, the particle size and the volume fraction of nanoparticles on the effective elastic moduli of the composites are also discussed. © (2013) Trans Tech Publications, Switzerland.

关键词： Homogenization method

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An Effect Analysis of Color Design in Guangzhou Subway System: From the Color Universal Design Perspective

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International Conference on Structures and Building Materials (ICSBM 2013)

作者： Lin, Jingwei Tang, Jian Jinan Univ Key Lab Disaster Forecast & Control Engn Minist Educ Peoples Republ China Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037856611

The Guangzhou Subway System adopts a planning scheme that guides passengers through a system of symbolic colors for its routes. However, the designers seem to have neglected color blind's difficulty in distinguishing some hues when selecting the routes' symbolic colors, which suggests that color universal design theories are not properly applied in their design work. This research aims at evaluating Guangzhou Subway's symbolic color and guidance system from the color universal design perspective. We use the Vischeck[1] to simulate and analyze the practical situation. In accordance with the analysis, solutions are recommended.

关键词： Urban planning Subways Guangzhou subway's symbolic color and guidance system Color barrier-free design

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The Analysis of Planning Guide Effect of Guangzhou Metro Line Five's Construction to the Non-existed Central District of the City

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2nd International Conference on Civil engineering and Transportation (ICCET 2012)

作者： Zhao, Qian Tang, Jian Jinan Univ Key Lab Disaster Forecast & Control Engn Minist Educ Peoples Republ China Guangzhou 510632 Guangdong Peoples R China

ISBN: (纸本)9783037855645

This essay discusses the effect of what the construction of the Metro Line Five of Guangzhou has to the development of existing central district and non-existed central district of Guangzhou City. Through the investigation and research into the quantity change of the public facilities around every exit of Metro Line Five within 500 meters, the essay analyses the planning guide effect of the construction of Metro Line Five to the land development and city construction of Guangzhou.

关键词： Urban planning Railroad transportation Metro Lines non-existed central district TOD

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