Dynamic Response Analysis for Two Typical Structures of Saturated Asphalt Pavements with 3D Finite Element Method

2011 ◽  
Vol 255-260 ◽  
pp. 3391-3396
Author(s):  
Rui Bo Ren ◽  
Li Tao Geng ◽  
Wen Yang Qi
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Asphalt Pavement ◽  
Fluid Pressure ◽  
Asphalt Mixture ◽  
Temporal Distribution ◽  
Element Model ◽  
Response Analysis ◽  
Flexible Base ◽  
Base Course

The combined effect of moisture and dynamic loading on asphalt mixtures has been recognized as one of the main causes of premature deterioration of flexible pavements. Based on porous medium theory, the asphalt mixture is regard as saturated porous material, and a three-dimensional finite element model is established to investigate dynamic response of two typical asphalt pavement structures, which are the semi-rigid asphalt pavement and the semi-rigid asphalt pavement with flexible base course. Then the spatial and temporal distribution of stress, strain and pore fluid pressure of the two structures are calculated, respectively. Analysis results show the superiority of semi-rigid asphalt pavement structure with flexible base course to the semi-rigid asphalt pavement in aspect of moisture resistance capability.

Analysis of the Dynamic Response for Saturated Asphalt Pavement under Moving Vehicle Loads by Three-Dimensional Finite Element Method

2011 ◽  
Vol 97-98 ◽  
pp. 305-310
Author(s):  
Rui Bo Ren ◽  
Li Tao Geng ◽  
Wen Yang Qi
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Asphalt Pavement ◽  
Three Dimensional ◽  
Element Model ◽  
Temporal And Spatial Distribution ◽  
Moving Vehicle ◽  
Dimensional Finite Element ◽  
Vehicle Loads ◽  
Three Dimensional Finite Element

The dynamic response of saturated asphalt pavement subjected to moving vehicle load is studied. Based on the porous media theory, a three-dimensional finite element model is developed and the temporal and spatial distribution of three directional stresses and strains are calculated in saturated pavement and compared with those in dry condition. The results show obvious difference between saturated and dry asphalt pavement, especially in asphalt layer.

Dynamic response analysis of aero hydraulic pipeline system under pump fluid pressure fluctuation

2018 ◽  
Vol 233 (5) ◽  
pp. 1585-1595 ◽  
Author(s):  
Pei-xin Gao ◽  
Jing-yu Zhai ◽  
Qing-kai Han
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Response ◽  
Pressure Fluctuation ◽  
Method Of Characteristics ◽  
Fluid Pressure ◽  
Numerical Code ◽  
Response Analysis ◽  
Pipeline System ◽  
Element Method

The pressure fluctuation excited by the hydraulic pump can cause serious vibration in aero hydraulic pipeline system, which poses a serious threat to the safety of the aircraft. Therefore, an effective method for predicting the fluid pressure fluctuation and dynamic response of pipeline is strongly recommended. In this paper, a comprehensive model for predicting the dynamic response of pipeline, which includes the Poisson coupling, friction coupling, the vibration damping, Coriolis, and centrifugal forces is proposed. A numerical code is presented to solve the hydraulic pipeline equations. In this code, the hydraulic equations are solved by the method of characteristics and the dynamic equations of pipeline are solved by the finite element method combined with the Newmark algorithm. The numerical code is validated through the comparison of the dynamic response for a typical hydraulic pipeline with experiment. The obtained results indicate that the current combining method of characteristics and finite element method approach can predict the dynamic response of hydraulic pipeline with sufficient accuracy, which can serve as an efficient tool in the design and maintenance of aero hydraulic pipeline.

Dynamic Response Analysis of Ship Hull Structures

2000 ◽  
Vol 37 (03) ◽  
pp. 117-128
Author(s):  
T. V. S. R. Appa Rao ◽  
Nagesh R. Iyer ◽  
J. Rajasankar ◽  
G. S. Palani
Keyword(s):  
Finite Element ◽  
Finite Elements ◽  
Dynamic Response ◽  
Finite Element Model ◽  
Element Model ◽  
Ship Hull ◽  
Response Analysis ◽  
Dynamic Response Analysis ◽  
Hull Structure ◽  
The Finite Element Model

Finite-element modeling and use of appropriate analytical techniques play a significant role in producing a reliable and economic design for ship hull structures subjected to dynamic loading. The paper presents investigations carried out for the dynamic response analysis of ship hull structures using the finite-element method. A simple and efficient interactive graphical preprocessing technique based on the "keynode" concept and assembly-line procedure is used to develop the finite-element model of the hull structure. The technique makes use of the body plan of a ship hull to build the finite-element model through an interactive session. Stiffened plate/shell finite elements suitable to model the hull structure are formulated and used to model the structure. The finite elements take into account arbitrary placement of stiffeners in an element without increasing the number of degrees-of-freedom of the element. A three-dimensional finite-element model and a procedure based on the Bubnov-Galerkin residual approach are employed to evaluate the effects of interaction between the ship hull and water. Mode superposition technique is used to conduct the dynamic response analysis. The efficiency of the finite elements and the procedures is demonstrated through dynamic analysis of a submerged cantilever plate and a barge when both are subjected to sinusoidal forces. The dynamic responses exhibit expected behavior of the structure and a comparison with the results available in the literature indicate superior performance of the finite element and methodologies developed. Thus, the finite-element models and the procedures are found to be efficient and hence suitable for the dynamic analysis of similar structures.

Dynamic Response Analysis of Stop Log Gates in Power Station’s Running Process

2014 ◽  
Vol 1070-1072 ◽  
pp. 1906-1910
Author(s):  
Min Zhe Zhou ◽  
Tong Chun Li ◽  
Yuan Ding ◽  
Yun Guo
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Finite Element Model ◽  
Pressure Distribution ◽  
Water Depth ◽  
Element Model ◽  
Response Analysis ◽  
Upstream Pressure ◽  
The Difference ◽  
Horizontal Displacements

In this paper, a 3-D finite element model was established for stop log gates. It is used for researching its force situation in process of power on and power off. The vertical pressure distribution around stop log gates shows that with water depth increasing, the difference of downstream pressure and upstream pressure of gates become more obvious. Between power on and power off processes, the stop log gates’ pressure differences and horizontal displacements are opposite.

Dynamic Response Analysis of Working Device of Hydraulic Excavator under Working Impact Loading

2009 ◽  
Vol 16-19 ◽  
pp. 39-43
Author(s):  
Li Xin Guo ◽  
Hua Long Xie ◽  
Shu Wen Zhou ◽  
Jin Li Li ◽  
Zhao Wen Wang ◽  
...  
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Element Model ◽  
Structure Design ◽  
Resistance Force ◽  
Response Analysis ◽  
Hydraulic Excavator ◽  
Dynamic Response Analysis ◽  
Working Device ◽  
Resistance Forces

A there-dimensional finite element model of the working device of a single backhoe-bucket hydraulic excavator was developed to analyze and evaluate the rationality of structure design of the working device in this study. By finite element modal analysis, the resonant frequencies and vibration modes of the working device system were obtained. By dynamic response analysis, the changing trends of stress and strain of the device were obtained. In addition, the influence of different excavating resistance forces to the working device on dynamic response of the device system was compared for large and small resistance forces at the beginning excavation moment. The results show that a large resistance force at the initial excavating moment may result in the device vibrating with large vibration amplitude at the beginning excavation moment. These results might provide useful reference on design improvement of the excavator working device.

Nonlinear Finite Element Research for the Rutting of Asphalt Pavement Base on Shear Stress Analysis

2011 ◽  
Vol 97-98 ◽  
pp. 91-94
Author(s):  
Yi Dong ◽  
Miao Juan Peng ◽  
Yong Qi Ma ◽  
Wei Feng
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Stress Analysis ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Middle Layer ◽  
Element Model ◽  
Nonlinear Finite Element ◽  
Traffic Load ◽  
Pavement Base

In this paper, visco-elastic-plasticity theory is employed to establish a nonlinear finite element model of the asphalt mixture pavement. The influence of pavement structure, the ability of rutting resistance of middle layer and traffic load on shear stress distribution for asphalt pavement are discussed. The numerical results show that shear stress analysis can be used to analyze the rutting of asphalt pavement. The asphalt materials of middle layer have a great impact on rutting and shear stress. Modified asphalt is a useful middle layer material to decrease the rutting, and the hard asphalt is also an economical material to reduce rutting. Overload and overpressure easily cause pavement rutting damage. Pavement longitudinal grade is not the main reason leading to rutting at the long slope, but brake frequently in the long slope is the real cause of rutting.

scholarly journals Mechanical Characteristics of Asphalt Pavement Pothole Maintenance

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Fengjun Zhao ◽  
Yuhang Tang ◽  
Jianjun Wu ◽  
Zhi Huang ◽  
Mingyue Gao ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Void Ratio ◽  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Element Model ◽  
Filling Material ◽  
Ansys Software ◽  
Structure Form ◽  
The Finite Element Model

Traditionally, potholes are mainly paved for maintenance, and the asphalt mixture needs to be compacted. But due to the construction quality problem, the compacting degree of asphalt mixture may not be enough and the void ratio of asphalt mixture may not meet the requirements, resulting in the premature damage of the potholes after repair. If the repair material can be prefabricated, this problem will be well solved. So, based on the structure form of the prefabricated rapid maintenance of asphalt pavement, this paper aims to determine the most unfavorable loading position in pothole repair, which was established by the ANSYS software with the finite element model. The results show that the most unfavorable loading position of tensile stress for patch materials and joint filling material is C1-1 (A2-2) and the most unfavorable loading position of shear stress for joint filling material and leveling layer is B2-1 and C1-5. Subsequently, the influences of the material modulus, size, thickness, and modulus of the old pavement material on the potholes are calculated by using the finite element model under the most unfavorable loading position.

Random Dynamic Response Analysis of Asphalt Pavement Based on the Vehicle-Pavement Interaction

2015 ◽  
Vol 744-746 ◽  
pp. 1288-1297 ◽  
Author(s):  
Qian Li ◽  
Jun Qing Liu ◽  
Hong Liu
Keyword(s):  
Dynamic Response ◽  
Dynamic Load ◽  
Asphalt Pavement ◽  
Element Model ◽  
Response Analysis ◽  
Vehicle Speed ◽  
Tire Pressure ◽  
Random Load ◽  
Response Characteristics ◽  
Pavement Roughness

In order to analyze the dynamic response of asphalt pavement under vehicle load, the random characteristic of pavement roughness was considered and the vehicle was simplified into 1/2 model with four freedom degrees when establishing the dynamic load model. Then the sequence of the random dynamic load coefficient was obtained by developing a MATLAB program based on the incremental Newmark-β method. Based on the plane strain assumption, a two-dimensional layered finite element model of asphalt pavement was established by ABAQUS software. Then the dynamic load coefficient was used to modify tire pressure that would be applied on the ABAQUS model. Then dynamic response rule of the model and how it was effected by vehicle speed were studied under random load. The results show that under the condition of random load, dynamic response of the pavement structure exhibiting a fluctuation trend as vehicle speed increases and the dynamic response characteristics of each point is different.

Response Analysis of Asphalt Pavement on Vehicle Dynamic Load Based on Numerical Method

2011 ◽  
Vol 179-180 ◽  
pp. 1380-1383
Author(s):  
Li Cheng Yang ◽  
Li Wei Ning ◽  
Jin Xiang Hu ◽  
Yi Ping Luo
Keyword(s):  
Finite Element ◽  
Asphalt Pavement ◽  
Element Model ◽  
Vertical Displacement ◽  
Response Analysis ◽  
Layered System ◽  
Transverse Strain ◽  
Transverse Stress ◽  
Longitudinal Stress ◽  
Granular Base

The three dimensional finite element model of the pavement has been built on the basis of elastic-plastic finite element method and the assumption of the layered system of asphalt pavement. The layered flexible pavement is composed of asphalt surface, granular base and cohesive soil subgrade and is acted by dynamic movement load. The simulation results show that vertical displacement of asphalt surface has the maximum value and reduces gradually with the improvement of the road depth. Vertical stress, longitudinal stress and transverse stress result in the fatigue damage of asphalt pavement together. The key factor is the alternating variation of longitudinal stress. The maximum longitudinal stress and the maximum transverse stress exist in the junction of the asphalt layer and the granular base. Furthermore, the maximum longitudinal strain and the maximum transverse strain are induced in the junction of the granular base and the soil subgrade.

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