scholarly journals Mechanical Response and Structure Optimization of Nanomodified Asphalt Pavement

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Wenjun Gu ◽  
Yao Tian ◽  
Xuanyu Zhang
Keyword(s):  
Mechanical Response ◽  
Mechanical Performance ◽  
Asphalt Pavement ◽  
Structural Models ◽  
Structure Optimization ◽  
Design Parameters ◽  
Modified Asphalt ◽  
Unique Material ◽  
Pavement Structure ◽  
Pavement Thickness

Nanomaterials are widely used in the preparation of modified asphalt because they can improve the high-temperature performance of matrix asphalt and have achieved good engineering results. However, the existing research mainly focuses on the material analysis and formula development of nanomodified asphalt and has not yet been involved in the mechanical response of the nanomodified asphalt pavement structure. The mechanical response contains the horizontal tensile stress and the vertical compressive stress of SiO2 modified asphalt pavement. It is unable to propose the matching pavement structure combination for the unique material characteristics of nanomodified asphalt, which leads to the increase of the possibility of pavement diseases and material waste. Hence, considering that semirigid base is the most widely used base type in China, two different structural models of nanomodified asphalt pavement are established according to the current specifications. The effects of pavement thickness, material type, and pavement design parameters on the mechanical response of nanomodified asphalt pavement are analyzed, and then the principle of optimal mechanical performance is taken and the optimal combination of nanomodified asphalt pavement structure is proposed.

Structural Optimization Design on the Sunflower Shaped Arch Bridge

2013 ◽  
Vol 427-429 ◽  
pp. 90-93 ◽  
Author(s):  
Wen Qing Wang
Keyword(s):  
Optimization Design ◽  
Mechanical Response ◽  
Mechanical Performance ◽  
Orthogonal Experiment ◽  
Design Parameters ◽  
Analysis Model ◽  
Range Analysis ◽  
Element Analysis ◽  
Arch Bridge ◽  
Four Levels

Based on the principle of orthogonal test, the optimization model of sunflower shaped arch bridge scheme was set up. The five key design parameters were selected as the main factors. The four computation index, which reflect mechanical performance, were selected as analytical objects. The 16 orthogonal experiment schemes were arranged with four levels orthogonal table . The curves of the factors to the index were obtained from the mechanical response under dead load and live load through the finite element analysis model. By the range analysis method, the influential levels of the factors to the index were obtained from the result of the test , and the factor optimizatuion level of the factors was determined to further optimize the layout scheme of the sunfloawer shaped arch bridge.

Mechanical Response Analysis of Heavy Traffic on Semi-Rigid Base Pavement Performance

2011 ◽  
Vol 97-98 ◽  
pp. 146-150 ◽  
Author(s):  
Chun Feng Yang ◽  
Hui Ran Pi ◽  
Tian Xiao ◽  
Can Zhang Jin
Keyword(s):  
Mechanical Response ◽  
Asphalt Pavement ◽  
Heavy Traffic ◽  
Pavement Performance ◽  
Rigid Base ◽  
Response Analysis ◽  
Structure Form ◽  
Pavement Structure ◽  
Response Variation ◽  
The Impact

Viewing so many overload vehicles, this paper analyzes the stress distribution of asphalt pavement structure under heavy traffic theoretically, according to the main asphalt pavement structure form in our country. By using elastic layer theory and BISAR3.0 program, analyzed the mechanical response variation of semi-rigid base asphalt pavement under different axle loads. The results showed that the mechanical response and the stress indexes of pavement structure under heavy traffic changed significantly. Therefore, in asphalt pavement design, the impact of heavy traffic should be fully considered and we must take measures to control the overload situation.

Analysis on Three-Direction Strain of Asphalt Pavement Structure Based on Accelerated Pavement Testing

2011 ◽  
Vol 255-260 ◽  
pp. 3426-3431 ◽  
Author(s):  
Jin Ting Wu ◽  
Fen Ye ◽  
Yin Ting Wu
Keyword(s):  
Mechanical Response ◽  
Asphalt Pavement ◽  
Research Result ◽  
Rigid Base ◽  
Accelerated Pavement Testing ◽  
Moving Vehicle ◽  
Vehicle Loads ◽  
Pavement Structure ◽  
Pavement Testing ◽  
Strain Responses

The internal mechanical response of asphalt pavement structure is difficult to be obtained because of the limitations of theoretical calculation and present testing methods. In order to get practical information of instructure layers, this paper analyzed the cumulative and instantaneous strains of layers’ bottom of semi-rigid base asphalt pavement based on Accelerated Pavement Testing and Fiber Bragg Grating sensors, as well as got the spatial distribution and time-variation law of longitudinal, lateral and vertical strain responses under controlled loading condition. The research result shows that under the moving vehicle loads, there is an obvious alternative property of tension-compression as the strain response of the pavement structure, and different variation shapes of instantaneous stain are in different layers from top to down. Also the measured instantaneous three-direction strain of the bottom of each surface are higher than the calculated values with BISAR, while they anatomizes well in base. This paper can be regarded as useful and tentative research and application on future correlative study.

Management Research on Treatment Measures for Differential Settlement of Tianjin-Binhai Expressway's Widened Subgrade

2014 ◽  
Vol 505-506 ◽  
pp. 28-34
Author(s):  
Yu Guo Wei ◽  
Wei Feng Zhou ◽  
Yuan Yuan Li
Keyword(s):  
Quality Control ◽  
Mechanical Response ◽  
Differential Settlement ◽  
Design Parameters ◽  
Management Research ◽  
Analysis Model ◽  
Treatment Measures ◽  
Pavement Structure ◽  
Final Settlement

Control of differential settlement of widened subgrade is one of key pints for the quality control of expressway reconstruction and extension projects and a focus for many scholars. In the paper, the analysis model of the pavement structure stress is built based on character and design parameters of the subgrade and pavement of Tianjin-Binhai Expressway. The control standards for the subgrade and pavements differential settlement of Tianjin-Binhai Expressway are confirmed through analyzing the pavements mechanical response under different differential settlements and treatment measures are taken according to classification of different differential settlements to control the final settlement amount within the preset range, which provides references for renovation and extension projects in future.

scholarly journals An Interval Parameter Calculation Method of Asphalt Pavement Structure Design Based on Point Numerical Algorithm

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Limin Tang ◽  
Xiuyan Zhao
Keyword(s):  
Interval Analysis ◽  
Asphalt Pavement ◽  
Fatigue Cracking ◽  
Interval Number ◽  
Structure Design ◽  
Design Parameters ◽  
Complex Nature ◽  
Interval Numbers ◽  
Analysis And Design ◽  
Pavement Structure

In the asphalt pavement structure design method, the structural analysis and design are generally performed in the form of point values. However, determining the point value form of design parameters based on the statistical analysis theory cannot fully reflect the complex properties such as variability and uncertainty of parameters. In order to further improve the reliability and practicability of pavement design parameters, in this article, we have introduced the interval number representation that can better reflect the complex nature of parameters; but the interval number algorithm is too complicated and common calculation tools and software are difficult to adopt, which limit the wide application of interval analysis to some extent. The article analyzes the algorithm of interval numbers, focusing on the analysis of interval numbers of unary and binary functions. In this way, the point number operation can be used to obtain the interval number result of the function consistent with the interval number algorithm, which avoids the complicated interval number operation process and the interval expansion. The point numerical function algorithm of interval numbers is verified by design parameters and the calculation of asphalt pavement structure such as axle load conversion, cumulative equivalent axis calculation, calculation of foundation layer tensile stress of each structure layer, calculation of mixture penetration strength, fatigue cracking check of asphalt mixture layer, permanent deformation check, and vertical pressure strain test of roadbed top surface. In conclusion, this research provides a simple and easy way to implement the application of mathematical tools for interval analysis, which is suitable for direct use for existing point numerical calculation tools and software.

Reliability Analysis of Asphalt Pavement Structure Based on Three-Dimensional Finite Element

2011 ◽  
Vol 255-260 ◽  
pp. 3421-3425
Author(s):  
Shi Bin Ma ◽  
Kai Wang ◽  
Yang Feng Wu ◽  
Lian Yu Wei ◽  
Ming Wei Zhang
Keyword(s):  
Reliability Analysis ◽  
Asphalt Pavement ◽  
Limit State ◽  
Three Dimensional ◽  
Latin Hypercube Sampling ◽  
Failure Criteria ◽  
Design Parameters ◽  
State Function ◽  
Element Analysis ◽  
Pavement Structure

The design of asphalt pavements in china is currently based on the multilayered elastic method, which is analytical in nature and yields stresses, strains, and deflections in the pavement system for a particular loading condition and pavement geometry, which are compared with established failure criteria to determine the performance of the given pavement. This design approaches is deterministic. In this paper, typical asphalt pavement structure reliability analysis was performed in which factors that affect pavement reliability regarded as input random , pavement surface deflection, layers of bottom stress and limit state function regarded as output variables , by reliability tool infinite element analysis, base on Monte Carlo’s Latin hypercube sampling method.At last the paper pertinently offered decision basis for improve the reliability of pavement structure and important reference values for drafting and selecting of asphalt pavement design parameters through calculating the reliability of pavement structure, sensitivity analysis of the design parameters is made.

Mechanical and Economic Analysis of Asphalt Pavement Structure on Mix Base

2012 ◽  
Vol 204-208 ◽  
pp. 1626-1632
Author(s):  
Hong Wei Peng ◽  
Bi Feng Ou
Keyword(s):  
Data Analysis ◽  
Design Theory ◽  
Mechanical Performance ◽  
Poisson Ratio ◽  
Asphalt Pavement ◽  
Compressive Strain ◽  
Rigid Base ◽  
Flexible Base ◽  
Pavement Structure ◽  
Pavement Structures

Based on asphalt pavement design theory and criterions in China, five asphalt structures are put out, including three mix base pavement structures, one typical semi-rigid base pavement structure and one typical flexible base pavement structure. For contract study, different pavement structures were selected with various combinations of modulus and Poisson ratio, but the total thickness is same for comparative analysis. The stress-strain at different depth in asphalt layer is calculated by using BISAR program. The data analysis is carried out for the maximum tensile stress, and the maximum strain of asphalt layer, and the maximum compressive strain on top of sub grade, deflection on asphalt surface. And budget basis price for base is contrasted too. The data analysis results show that the mix base asphalt pavement structures can be designed to get better pavement mechanical performance than typical semi-rigid base and typical flexible base asphalt pavement structures, while the price is higher than that of semi-rigid base. If we consider fatigue life, the cost performance for mix base of upper base with asphalt stabilized macadam is the best. This gives out the important reference for widespread the mix base in future.

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