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检索条件"机构=MOE Key Lab of Disaster Forecast and Control in Engineering"

共 463 条记录，以下是401-410 订阅

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A Quasi-Green's Function Method for the Bending Problem of Simply Supported Polygonal Shallow Spherical Shells on Pasternak Foundation

A Quasi-Green's Function Method for the Bending Problem of S...

引用

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 quasi-Green's function method (QGFM) is applied to solve the bending problem of simply supported polygonal shallow spherical shells on Pasternak foundation. A quasi-Green's function is established by using the fundamental solution and the boundary equation of the problem. And the function satisfies the homogeneous boundary condition of the problem. Then the differential equation of the problem is reduced to two simultaneous Fredholm integral equations of the second kind by the Green's formula. The singularity of the kernel of the integral equation is overcome by choosing a suitable form of the normalized boundary equation. The comparison with the ANSYS finite element solution shows a good agreement, and it demonstrates the feasibility and efficiency of the proposed method.

关键词： Green's function R-function integral equation bending of shallow spherical shell Pasternak foundation

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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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A Quasi-Green function method for free vibration of clamped orthotropic parallelogram thin plates on Winkler foundation

A Quasi-Green function method for free vibration of clamped ...

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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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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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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 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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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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Experimental investigations on mechanical properties and fire resistance of steel-polypropylene hybrid fiber reinforced concrete

Experimental investigations on mechanical properties and fir...

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2013 International Conference on Future Energy and Materials Research, FEMR 2013

作者： Ouyang, Dong Kong, Lin Jie Fu, Hao Lu, Liu Lei Liao, Long Huang, Chen wu MOE Key Lab of Disaster Forecast and Control in Engineering Jinan University Guangdong 510632 China Center for Engineering Materials and Struture Durability Research Jinan University Guangdong 510632 China

ISBN: (纸本)9783037857892

This paper investigates the mechanical properties and the fire resistance of steel-polypropylene hybrid fiber-reinforced concrete. The type of the polypropylene fibers are polypropylene monofilament fiber, polypropylene fibrillated fiber, and macro polypropylene fiber, and the type of the steel fibers is hooked steel fiber. The experimental results show that the compressive strength, splitting tensile strength and flexural properties of steel-macro polypropylene hybrid fiber reinforced concrete are better than any others. And the fire resistance of steel-monofilament polypropylene hybrid fiber reinforced concrete is the best. © (2013) Trans Tech Publications, Switzerland.

关键词： Polypropylenes

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Full-range behavior of FRP-to-concrete bonded joints with trilinear bond-slip law

Full-range behavior of FRP-to-concrete bonded joints with tr...

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5th International Conference on Structural engineering, Mechanics and Computation, SEMC 2013

作者： Yuan, H. Wu, L. MOE Key Lab of Disaster and Control in Engineering Institute of Applied Mechanics Jinan University Guangzhou China

ISBN: (纸本)9781138000612

This paper presents a close-form analytical solution of both interfacial shear stress distribution and load-displacement response, which is capable of predicting the entire debonding propagation process including elastic, elastic-flow, elastic-flow-softening, elastic-flow-softening-debonding, flow-softening-debonding, and softening-debonding stages. Based on experimental result of high Young's modulus type of CFRP plateto- concrete bonded joints, a nonlinear fracture mechanics method, in which the tri-linear local bond slip law is employed, is used to understand the stress transfer mechanism, interfacial crack propagation and ductility behavior in adhesive bonded joint. It is also shown how experimental load-displacement response of bonded joints can be used to identify interfacial properties, including the interfacial fracture energy and parameters of the local bond-slip relationship. The concept of serviceability limit state and ultimate limit state is considered. © 2013 Taylor & Francis Group, London, UK.

关键词： Debonding

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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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