Subgrade Stiffness Effects on Mechanical Responses of Asphalt Pavement at Bridge Approach

2018 ◽  
pp. 90-107
Author(s):  
Xinhong Yang ◽  
Yan Dong ◽  
Jiupeng Zhang ◽  
Hongbing Zhu
Keyword(s):  
Asphalt Pavement ◽  
Mechanical Responses ◽  
Bridge Approach

Evaluation of different modulus input on the mechanical responses of asphalt pavement based on field measurements

2021 ◽  
Vol 312 ◽  
pp. 125299
Author(s):  
Guoping Qian ◽  
Changyun Shi ◽  
Huanan Yu ◽  
Ding Yao ◽  
Xuan Zhu ◽  
...  
Keyword(s):  
Asphalt Pavement ◽  
Field Measurements ◽  
Mechanical Responses

scholarly journals Comparison of Nonlinear Analysis Algorithms for Two Typical Asphalt Pavement Analysis Programs

2020 ◽  
Vol 15 (4) ◽  
pp. 225-251
Author(s):  
Xin Jiang ◽  
Kang Yao ◽  
Hanyan Gu ◽  
Zhenkun Li ◽  
Yanjun Qiu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Nonlinear Analysis ◽  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Layered System ◽  
The Finite Element Method ◽  
Mechanical Responses ◽  
Analysis Methods ◽  
Element Method

Two representative programs, MICH-PAVE and KENLAYER, are selected and compared to many key aspects of their analysis algorithms to achieve an in-depth understanding of the features of the Finite Element Method and elastic layered system theory in nonlinear material analysis of the structure of asphalt pavement. Furthermore, by conducting a case study, the impact of using different analysis methods on the calculation results is presented. Moreover, the feasibility of the equivalent resilient modulus obtained by the Finite Element Method is discussed. The results show that the difference among the nonlinear analysis algorithms used by the two software packages is mainly reflected in the determination of the initial resilient modulus, the stress correction, and the convergence condition. Besides, the Finite Element Method could consider the variation of the resilient modulus induced by the change in the stress condition in both the radial and the depth directions simultaneously. In contrast, the theory of the elastic layered system only considers the dependence of the resilient modulus on the stress in the depth direction. Additionally, the use of diverse nonlinear analysis methods has different levels of impact on mechanical responses. Finally, the equivalent resilient modulus obtained by nonlinear analysis can be used to calculate mechanical responses of pavement structure except the surface deflection in a linear analysis.

Study on Mechanical Responses of Typical Asphalt Pavement Structure

2013 ◽  
Vol 361-363 ◽  
pp. 1723-1726
Author(s):  
Xiao Li ◽  
Shan Qin Chen ◽  
Qi Wei Li
Keyword(s):  
Tensile Strain ◽  
Mechanical Response ◽  
Asphalt Pavement ◽  
Rigid Base ◽  
Design Specification ◽  
Layer System ◽  
Mechanical Responses ◽  
Vertical Strain ◽  
Flexible Base ◽  
Base Structure

Semi rigid asphalt pavement, flexible base asphalt and composite base asphalt pavement are the main structure forms of asphalt pavement. The mechanical distributions are different in those structures. Based on elastic layer system, this paper took the Shell designing software BISAR3.0 as calculation tool to get the tensile strain of three kinds of models, the distribution of main mechanical response were compared with each other using the ORIGIN8.0. Then a comprehensive analysis was made based on the mechanical response distributions of the three structures. The results show that: flexible tensile strain and vertical strain in the bottom of asphalt layers of semi rigid base structure is the smallest, as it shows better performance. It proves that the design specification adopting now is not suitable for semi rigid base pavement

Assessment of variations in asphalt pavement mechanical responses

2018 ◽  
pp. 351-355
Author(s):  
A. Loizos ◽  
B. Cliatt ◽  
C. Plati ◽  
K. Gkyrtis
Keyword(s):  
Asphalt Pavement ◽  
Mechanical Responses

scholarly journals Viscoelastic Mechanical Responses of HMAP under Moving Load

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2490 ◽  
Author(s):  
Yazhen Sun ◽  
Bincheng Gu ◽  
Lin Gao ◽  
Linjiang Li ◽  
Rui Guo ◽  
...  
Keyword(s):  
Dynamic Modulus ◽  
Tensile Strain ◽  
Mechanical Response ◽  
Asphalt Pavement ◽  
Moving Load ◽  
High Modulus ◽  
Wave Load ◽  
Mechanical Responses ◽  
Finite Element Software ◽  
Asphalt Mix

In order to represent the mechanical response laws of high-modulus asphalt pavement (HMAP) faithfully and objectively, the viscoelasticity of high-modulus asphalt mixture (HMAM) was considered, and the viscoelastic mechanical responses were calculated systematically based on moving load by numerical simulations. The performances of the HMAP in resistance to the deformation and the cracking at the bottom layer were compared with the ordinary asphalt pavement. Firstly, Lubao and Honeywell 7686 (H7686) were selected as the high modulus modifiers. The laboratory investigations of Asphalt mix-70 penetration, Asphalt mix-SBS (styrene-butadiene-styrene), HMAM-Lubao and HMAM-H7686 were carried out by dynamic modulus tests and wheel tracking tests. The conventional performances related to the purpose of using the HMAM were indicated. The master curves of the storage moduli were obtained and the viscoelastic parameters were fitted based on viscoelastic theories. Secondly, 3D pavement models based on moving loads for the viscoelastic structures were built using the non-linear finite element software ABAQUS. The wheel path was discretized in time and space to apply the Haversine wave load, and then the mechanical responses of four kinds of asphalt pavement were calculated. Finally, the sensitivity analysis was carried out. The results showed that the addition of the high modulus modifiers can improve the resistance to high-temperature rutting of the pavements. Except for the tensile strain and stress at the bottom of the underlayer, other responses decreased with the increases of the dynamic moduli and the change laws of the tensile strain and stress were affected by the range of the dynamic modulus. The tensile stress at the bottom of the asphalt layer would be too large if the modulus of the layer were too large, and a larger tensile strain would result. Therefore, the range of the modulus must be restricted to avoid the cracking due to excessive tension when using the HMAM. The resistance of the HMAP to deformation was better and the HMAP was less sensitive to load changes and could better withstand the adverse effects inflicted by heavy loads.

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