Analysis of Displacement Filed of Asphalt Airport Pavement

2014 ◽  
Vol 505-506 ◽  
pp. 125-128
Author(s):  
Wei Zhang ◽  
Zhic Chao Sun ◽  
Xian Min Zhang ◽  
Hua Xin Xue
Keyword(s):  
Asphalt Concrete ◽  
Mechanical Response ◽  
Asphalt Pavement ◽  
Element Model ◽  
Vertical Displacement ◽  
Development Trend ◽  
Displacement Curve ◽  
Tire Pressure ◽  
Airport Pavement ◽  
Aircraft Loads

Considering the future development trend of the airport pavement, a 3-D finite element model with 45m×20m×11.62m full-scale slabs is established to analyze the displacement response of asphalt concrete airport pavement under aircraft loads. Under different aircraft tire pressure levels, the vertical displacement and vertical displacement curve of the pavement in the region between 9 m and 13 m outside aircraft wheels is analyzed. The mechanical response of flexible pavement is studied, and the influence of various parameters on asphalt pavement.

Displacement Field Study on the Full Width of Rigid Airport Pavement to Aircraft Loadings

2012 ◽  
Vol 178-181 ◽  
pp. 1611-1614 ◽  
Author(s):  
Xian Min Zhang ◽  
Qian Dong
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Displacement Field ◽  
Element Model ◽  
Vertical Displacement ◽  
Transfer Effect ◽  
Full Width ◽  
Airport Pavement ◽  
Vertical Displacements ◽  
Aircraft Loads

Considering the joint loading-transfer effect, a 3-D finite element model which consists of thirty full-scale slabs is established. Making the aircraft loads act on different positions and calculating their vertical displacements. The results indicate that the loading area is compressive and the regions far away from loading area are tensile and that the vertical displacement curves change dramatically when aircraft wheels act on different locations.

Analysis of the Mechanical Impact of High-Modulus Asphalt Concrete on Road Structure

2011 ◽  
Vol 97-98 ◽  
pp. 334-339 ◽  
Author(s):  
Xiu Shan Wang ◽  
Tuan Jie Chen ◽  
Xiao Jun Ding
Keyword(s):  
Finite Element ◽  
Asphalt Concrete ◽  
Mechanical Response ◽  
Asphalt Pavement ◽  
Three Dimensional ◽  
High Modulus ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Load Carrying ◽  
The Ideal

In order to study the rutting problem of asphalt pavement, this paper sets up a three-dimensional model of asphalt pavement with finite element. By analyzing the mechanical response of high-modulus asphalt concrete at different layers, this paper finds out the layer set of high-modulus asphalt concrete. At the same time, it further analyzes the influence of the modulus’ size and thickness of the high-modulus asphalt concrete on the load-carrying capability of road structure. The results show that high-modulus asphalt concrete can significantly restrain rutting problem and the recommend ideal modulus is between 2000MPa and 2500MPa; the ideal thickness ranges from 5cm to 7cm.

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.

Load Stress Analysis of Airport Pavement Based on Multi-Structural System

2011 ◽  
Vol 217-218 ◽  
pp. 568-571
Author(s):  
Zi Yan Wu ◽  
Jin Fang Guan ◽  
Zhi Qiang Lu ◽  
Jian Min Liu
Keyword(s):  
Finite Element ◽  
Load Transfer ◽  
Mechanical Response ◽  
Element Model ◽  
Transfer Efficiency ◽  
Von Mises Stress ◽  
Base System ◽  
Airport Pavement ◽  
Von Mises ◽  
Large Aircraft

The mechanical response of airport pavement under multiple-gear of the new large aircraft loadings behaves differently from traditional mechanical response problems. In this paper, a 3-D finite element model of nine 5m×5m full size slabs rigid airport pavement with load transfer of joints and multilayer base system is established, using the finite element method. With the example of airplane A380, we analyzed the Von Mises stress distribution when the large aircraft loadings act on different locations of the pavement slabs. The result shows that the critical of Von Mises stress does not occur at the slab edge but closer to the center of the loading area in the edge load cases; in addition, through setting different parameters of joint load transfer stiffness, the relationship between the joints stiffness and the load transfer efficiency of adjacent slabs is found. It is demonstrated that for higher joint stiffness there is higher transfer efficiency.

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.

Mechanics Analysis of Asphalt Pavement with Crumb Rubber Modified Cement Stabilized Macadam Base

2012 ◽  
Vol 446-449 ◽  
pp. 2397-2401 ◽  
Author(s):  
Hong Mei Guo ◽  
Han Zhu
Keyword(s):  
Asphalt Concrete ◽  
Large Scale ◽  
Asphalt Pavement ◽  
Vertical Displacement ◽  
Crumb Rubber ◽  
Tension Stress ◽  
Structure Model ◽  
Analysis Software ◽  
Element Analysis ◽  
Highway Engineering

Reuse of the waste tires in highway engineering is very important for reducing pollution, protecting environment and resources. At present, the rubber chippings from waste tire have been widely used in construction and maintenance of asphalt concrete road surface. But there is little research about cement stabilized macadam base with crumb rubber. This paper used the large-scale finite element analysis software ANSYS to build the pavement structure model, assuming the contact conditon as continuity, analyzed the effect of asphalt pavement by changing the thickness and modulus of cement stabilized macadam base with crumb rubber. The results showed that the value of vertical displacement of crumb rubber modified cement stabilized macadam base is larger than the value of cement stabilized crushed stones base, and increasing the thickness and reducing the modulus of base can decrease tension stress of base bottom.

Study on Mechanical Response Changes of Pavement to Aircraft Loads with Different Landing Gear Configurations

2015 ◽  
Vol 723 ◽  
pp. 60-64
Author(s):  
Wei Zhang ◽  
Qian Dong ◽  
Xian Min Zhang
Keyword(s):  
Finite Element ◽  
Mechanical Response ◽  
Element Model ◽  
Maximum Tensile Stress ◽  
Landing Gear ◽  
Mechanical Responses ◽  
Solid Foundation ◽  
Aircraft Loads ◽  
The Finite Element Model ◽  
Displacement Peak

The finite element model of runway is established based on elastic layered theory and it is used for analyzing the influence on mechanical responses due to changes of main landing gear configurations. The results show that the more the total number of wheels on a main landing gear is, the smaller displacement peak, maximum tensile stress under panel bottom and solid foundation influence depth are in conditions that aircraft loads are equal. When the landing gear spacing is smaller, the displacement curves in the loading area are gentler. The changes of configurations influence little on displacements in regions far away from loading area.

Rutting Evaluation of Hot and Warm Mix Asphalt Concrete under High Aircraft Tire Pressure and Temperature at National Airport Pavement and Materials Research Center

2018 ◽  
Vol 2672 (23) ◽  
pp. 117-127 ◽  
Author(s):  
Navneet Garg ◽  
Hasan Kazmee ◽  
Lia Ricalde ◽  
Timothy Parsons
Keyword(s):  
Environmental Exposure ◽  
Asphalt Concrete ◽  
Scientific Information ◽  
Field Performance ◽  
Warm Mix Asphalt ◽  
Research Center ◽  
Tire Pressure ◽  
Airport Pavement ◽  
Materials Research ◽  
Pavement Testing

The aircraft industry’s propensity to increase the range of aircraft results in increased gross weight and tire pressure. Therefore, performance assessment of airfield asphalt concrete mixes under such high tire pressure and extreme environmental exposure becomes imperative for sustainable design implementation. Moreover, a lack of scientific information on the field performance has been a major roadblock in the adoption of green technologies like warm mix asphalt (WMA). An accelerated pavement testing study was undertaken at the Federal Aviation Administration’s National Airport Pavement and Materials Research Center to evaluate the rutting performance of hot and warm asphalt mixes at two different binder grades. Six test lanes were constructed – four outdoors and two indoors, each encompassing three different test sections. The constructed test sections were subjected to different combinations of tire pressure, temperature, and environmental exposure using a custom-designed airport heavy vehicle simulator. Both field performance and laboratory characterization tests indicated that WMA exhibited comparable performance to hot mix asphalt. Environmental aging was found to be conducive to the curing and enhanced rutting performance of polymer-modified WMA.

scholarly journals Research on Fatigue Model of Semi-Rigid Base Asphalt Pavement before and after Polymer Grouting

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Bei Zhang ◽  
Xu Zhang ◽  
Yanhui Zhong ◽  
Xiaolong Li ◽  
Meimei Hao ◽  
...  
Keyword(s):  
Numerical Model ◽  
Service Life ◽  
Fatigue Damage ◽  
Mechanical Response ◽  
Asphalt Pavement ◽  
Damage Model ◽  
Vertical Displacement ◽  
Polymer Materials ◽  
Rigid Base ◽  
Before And After

To improve the service life of a semirigid base asphalt pavement and prolong its service cycle, it is imperative to conduct long-term performance research before and after pavement disease repair. This study proposes a fatigue damage model for pavement and polymer materials and uses the finite element method to establish a three-dimensional numerical model of a semirigid base asphalt pavement structure. Moreover, it compares and analyzes the mechanical response and fatigue damage of this pavement before and after polymer repair. The evolution law is verified by indoor fatigue tests. The results show that, under a standard load of 0.7 MPa, the vertical displacement and the Mises stress of the vacant position after the polymer repair are reduced by 61% and 69%, respectively. Under a cyclic load of 1.2 MPa, the number of load actions increases from 500,000 to more than 5 million, and the fatigue damage factor of the polymer is reduced by 29%. With the increase in the number of fatigue test loads, the cumulative evolution trend of the fatigue damage is basically consistent with the results of the numerical simulation, which verifies the rationality of the numerical model. This research is relevant for providing a reference for extending the service life of expressways and improving the technical level of expressway maintenance.

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