Numerical Simulation of Expansion Joint Setting of Semi-rigid Base Layer

2022 ◽  
Author(s):  
Hong Zhang ◽  
Rui Zhang ◽  
Rigen Wu
Keyword(s):  
Numerical Simulation ◽  
Base Layer ◽  
Rigid Base ◽  
Expansion Joint

Mechanical Property of Pavement with Crack in Base and High Modulus Asphalt Layer

2012 ◽  
Vol 256-259 ◽  
pp. 1785-1788
Author(s):  
Shuai Tu
Keyword(s):  
Three Dimensional ◽  
Base Layer ◽  
Rigid Base ◽  
High Modulus ◽  
Limited Size ◽  
Stress Mode ◽  
Unit Model ◽  
Crack Tips ◽  
Load Analysis ◽  
Pavement Structure

When the crack appears in semi-rigid base layer, the stress mode of pavement structure transits from infinite continuum to limited size board, and the crack tips become stress concentration areas. This paper establishes the three-dimensional eight nodes entity reduced integral unit model by the practical tire contact pressure and contact area, to calculate and analyse the influence on the mechanical indexes in pavement structure with or without crack in base layer from high modulus asphalt layer under half-sinusoid load. Analysis shows that enhancing the modulus of surface layer could effectively reduce the tensile stress in bottom of base layer and avoid the bending broken in base bottom, but there exists risk that the bottom subbase and asphalt layer cracking.

Numerical Simulation Analysis of Temperature Stress of Super-Long Steel Structure Plant

2012 ◽  
Vol 170-173 ◽  
pp. 3668-3671
Author(s):  
Wei Hua Ma ◽  
Qing Juan Meng ◽  
Le Jie Liang
Keyword(s):  
Numerical Simulation ◽  
Temperature Stress ◽  
Simulation Analysis ◽  
Steel Structure ◽  
Vertical Displacement ◽  
Small Range ◽  
Expansion Joint ◽  
Design Basis ◽  
Main Component ◽  
Hole Structure

Numerical simulate analyze a super-long steel plant with ANSYS,calculate the structure in expansion joint,without expansion joint and without long circle bore structure of these three kind situations,analyze temperature stress and vertical displacement of the main component when the temperature changes.Setting expansion joint can control the temperature stress in a small range,which is a widely used method at present.However,not setting expansion joint and the use of long hole structure connection can control the size of the temperature stress and ensure the structure globality,it can provide design basis of this method in engineering applications.

The Study on Road Performance and Pavement Structure Analysis for the Base Layer Material Stabilized by SRX

2012 ◽  
Vol 594-597 ◽  
pp. 1402-1406 ◽  
Author(s):  
Yue Zhang ◽  
Yun Long Zhao ◽  
Bao Yang Yu
Keyword(s):  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Base Material ◽  
Base Layer ◽  
Rigid Base ◽  
The Road ◽  
Flexible Material ◽  
Calculation Results ◽  
Road Performance ◽  
Pavement Structure

In order to overcome the weakness of semi-rigidity base layer，the road performance of the SRX(Solution Road RomixSoilfix) stabilized base material and the mechanics response of asphalt pavement with the base layer stabilized by SRX have been studied in this paper. The CBR value and resilient modulus of SRX stabilized base material were given by indoor test. Based on the multiple layer elastic theory, both the mechanical responses of asphalt pavement structure with the SRX stabilized base and semi-rigid base were given, and according to the calculation results, the two kinds of pavement structure fatigue life were analyzed. The results have shown that the CBR value of SRX flexible material is greater than that of graded crushed stone; the SRX stable material can be used as pavement base layer, but the fatigue performance of SRX flexible base materials should be paid much attention.

scholarly journals Responses of Semi-Rigid Base Asphalt Pavement with Interlayer Contact Bonding Model

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Xuntao Wang ◽  
Xuanlong Ma
Keyword(s):  
Asphalt Pavement ◽  
Moving Load ◽  
Friction Model ◽  
Base Layer ◽  
Rigid Base ◽  
Vehicle Speed ◽  
Element Mesh ◽  
Bonding Failure ◽  
Higher Temperature ◽  
Pavement Structure

In this paper, an interlayer contact bonding model according to the Coulomb friction model was developed by contact element and target element to accurately simulate the bonding condition between the adjacent layers of semi-rigid base asphalt pavement. The interlayer contact bonding model can be used to not only simulate the partial bond condition between adjacent layers but also imitate the phenomenon of bonding failure between adjacent layers. Semi-rigid base asphalt pavement structure, finite element mesh, material property with temperature, kinds of interlayer bonding failure, and moving load were explained in detail, and the responses of the semi-rigid base asphalt pavement structure were calculated and analyzed by this model at the room temperature and the higher temperature. The results indicated that the disengaging area between the asphalt concrete layer and the base layer can negatively affect the strain responses of asphalt pavement, especially at the higher temperature, and it can also weaken the asphalt pavement performance with the increase of the disengaging area. The deformation of semi-rigid base asphalt pavement is intensified under the action of the high temperature and the overloads, which would be easy to result in potential pavement structural deficiency. At the higher temperature, the adverse effect of moving loads on asphalt pavement is greater than that of roadbed, and the responses of the asphalt pavement decrease with the increase of the vehicle speed.

scholarly journals A New-Type Semi-Rigid Base Layer Structure for Long Service Life Pavement

2021 ◽  
Vol 8 (3) ◽  
pp. 140-145
Author(s):  
Bowen Tian ◽  
Chuanfeng Zheng ◽  
Haisong Luo ◽  
Junpeng Xun
Keyword(s):  
Service Life ◽  
Layer Structure ◽  
Base Layer ◽  
Rigid Base ◽  
Vertical Strain ◽  
Transverse Tensile ◽  
New Type ◽  
Theoretical Evidence ◽  
Different Thickness

Targeting at the problem of pavement cracking under long-term load, this study developed a new-type semi-rigid base layer structure based on the CGC (cement stabilized macadam - graded broken stone - cement stabilized macadam) combinations, and used ANSYS to simulate this proposed structure under conditions of different modulus combinations, deflection under different thickness, different vertical strain values on the top surface of roadbed, and different transverse tensile stress values of bottom base layer. The simulation results indicate that, the various mechanical properties of the proposed new structure can well meet the specifications, and the time of crack generation has been slowed down; the use of graded broken stone in the proposed structure has achieved both the purposes of saving construction cost and reducing construction difficulty. By reasonably controlling the CGC structure and modulus, this study has successfully suppressed the generation of reflection cracks, which can provide good theoretical evidence for prolonging the service life of semi-rigid base layer pavement.

Thermal Effect Mechanism on Composite Pavement Consisted of Asphalt Surface Overlay and Concrete Layer

2012 ◽  
Vol 178-181 ◽  
pp. 1532-1536
Author(s):  
Ying Na Dong ◽  
Qiang Huang ◽  
Hua Ping Wang
Keyword(s):  
Numerical Simulation ◽  
Theoretical Analysis ◽  
Base Layer ◽  
Concrete Pavements ◽  
Worst Case ◽  
Influence Of Temperature ◽  
Effect Mechanism ◽  
Concrete Layer ◽  
Influence Of Temperature On ◽  
Concrete Joints

Composite pavement consisted of flexible asphalt surface overlay and rigid concrete base layer has come up. Though it occupies advantages of asphalt and concrete pavements, still there are problems containing thermal cracking, rutting deformation and pothole which result from the out-sync shrinkage of temperature. Therefore, influence of temperature on the composite pavement structure has been analyzed with methods of theoretical analysis and numerical simulation. And results indicate that the thickness of asphalt layer in some sense determines the influence extent of temperature and worst case happens at the concrete joints, which means that the optimal asphalt (Here, the best choice of asphalt thickness equals 16cm) and suitable joints should be designed.

Analysis of Stress and Strain for Semi-Rigid Asphalt Pavement Based on Accelerated Loading Test

2014 ◽  
Vol 587-589 ◽  
pp. 939-942
Author(s):  
Chuan Yi Zhuang ◽  
Ya Li Ye
Keyword(s):  
Tensile Strain ◽  
Dynamic Stress ◽  
Base Layer ◽  
Strain Gauges ◽  
Rigid Base ◽  
Stress And Strain ◽  
Loading Test ◽  
Structural Dynamic ◽  
Stress Sensors ◽  
Pavement Temperature

Through the construction of cement stabilized macadam and lime-fly ash stabilized macadam road, and strain gauges, vertical stress sensors and temperature sensors were laid in the pavement during construction. Pavement structure dynamic stress, strain, deflection and pavement temperature were collected. The correlation between pavement temperature and structural dynamic response was analyzed. The results showed that, tensile strain of semi-rigid base layer was less affected by temperature; structural deflection was great affected by the thickness of semi-rigid base. After a certain number of repeated loads, the delay rate of tensile strain of semi-rigid base layer increased first and then slowly decreased.

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