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SCIENTIFIC WORLD JOURNAL 2014年第1期2014卷 718702页

作者： Jia, Haokai Yu, Ling Wu, Guiying Jinan Univ Dept Mech & Civil Engn Guangzhou 510632 Guangdong Peoples R China Jinan Univ MOE Key Lab Disaster Forecast & Control Engn Guangzhou 510632 Guangdong Peoples R China Taiyuan Univ Technol Coll Mech Taiyuan 030024 Shanxi Peoples R China

Terrorist attacks on vulnerable structures and their individual structural members may cause considerable damage and loss of life. However, the research work on response and damage analysis of single structural components, for example, a slab to blast loadings, is limited in the literature and this is necessary for assessing its vulnerability. This study investigates the blast response and damage assessment of a two-way bending reinforced concrete (RC) slab subjected to blast loadings. Numerical modeling and analysis are carried out using the commercial finite element code LS-DYNA 971. A damage assessment criterion for the two-way bending RC slab is defined based on the original and residual uniformly distributed load-carrying capacity. Parametric studies are carried out to investigate the effects of explosive weight and explosive position on the damage mode of the two-way RC slab. Some design parameters, such as the boundary conditions and the negative reinforcement steel bar length, are also discussed. The illustrated results show that the proposed criterion can apply to all failure modes. The damage assessment results are more accurate than the ones due to the conventional deformation criterion.

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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...

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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 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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Design and application on multi-function construction platform of boom type road-header

Design and application on multi-function construction platfo...

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4th International Conference on Advanced engineering Materials and Technology, AEMT 2014

作者： Zhao, Qi Feng Gao, Wen Jiao Zhang, Wei Jie Li, Hong Tao Liu, Yuan Yuan Key Lab of Mine Disaster Prevention and Control of Hebei Province North China Institute of Science and Technology San he Hebei 065201 China Electromechanical Engineering College North China Institute of Science and Technology San he Hebei 065201 China Safety Training Department North China Institute of Science and Technology San he Hebei 065201 China

ISBN: (纸本)9783038352075

When the frame shield support was applied in the fully mechanized driving process of the seam gateway, there would be some incongruous problems. Aimed at the problems, mainly was discordance between the fully mechanized driving and the gateway support, we put forward the requirements of the multi-function platform and made the design scheme clear. By applying the finite element software, the simulation of the dynamics response was conducted on the multi-function platform. On this basis, an analysis was conducted on the stress of each loading part, the simulation results and mechanics calculations have shown the design of the multifunction platform could fully meet each technical index. The on-site applications have revealed that the platforms match with the fully mechanized driving machinery rationally;provide a safety standing basis for the construction of the frame shield support. Further, the platform has improved the mechanization of the frame shield support and increased the support operation efficiency. © (2014) Trans Tech Publications, Switzerland.

关键词： Machinery

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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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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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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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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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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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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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