Prediction of Viscoelastic Pavement Responses under Moving Load and Nonuniform Tire Contact Stresses Using 2.5-D Finite Element Method

Abstract

This study developed two-and-half dimensional (2.5-D) finite element method (FEM) to predict viscoelastic pavement responses under moving loads and nonuniform tire contact stresses. The accuracy of 2.5-D FEM was validated with two analytical solutions for elastic and viscoelastic conditions. Compared to three-dimensional (3-D) FEM, the computational efficiency of the 2.5-D method was greatly improved. The effects of loading pattern and speed on pavement surface deflection and strain responses were analyzed for asphalt pavements with four different asphalt layer thicknesses. The analyzed pavement responses included surface deflections, maximum tensile strains in the asphalt layer, and maximum compressive strains on top of subgrade. The loading patterns have influence on the mechanical responses. According to the equivalent rule, the point load, rectangle type, and sinusoid-shape contact stresses were studied. It was found that the point load caused much greater pavement responses than that of the area-based loading. When the tire loading was simplified as uniform contact stress in rectangular area, the maximum tensile strains in the asphalt layer varied with the width/length ratio of contact area. Additionally, it was shown that the dynamic responses of pavement structure induced by the sinusoid-shape contact stresses and realistic nonuniform stresses were quite similar to each other in all the cases. The pavement strain responses decreased as the speed increased due to viscoelastic behavior of asphalt layer. The study results indicate that asphalt pavement responses under moving load can be calculated using the proposed 2.5-D FEM in a fast manner for mechanistic-empirical pavement design and analysis.

Convergence Study of Variational Space‐Time Coupled Least‐Squares Frameworks in Simulation of Wave Propagation in Viscoelastic Medium

“…and base motion (Bms. ), with respective dominance in dispersive and di usive error types, were employed to investigate convergence characteristics of dGa and cLs weak formulations of damped wave (1). To this end, standard re nements were applied and numerical errors were plotted against the degrees of freedom (Dofs) used by re ned models.…”

“…Even though space-time coupled framework has been promoted by different researchers, the extra dimension of the computational domain makes it unappealing and hence not commonly utilized in study of real world problems. e focus of this research has been to investigate the computational characteristics of cLs and compare them to those of dGa for viscoelastic wave (1).…”

“…Employment of the elasticity theory to simplify the analysis proves to be inconsistent with the accurate behavior of materials, because most engineering materials have much dependency on their intrinsic properties due to internal friction. In mechanical problem, investigation of damping has a main role in smart mechanical tools, response free eldout and, structures such as tall building and high way bridges [1]. A number of researchers investigated damping property e ect of rubber-sand mixture material underlain by the structures to reduce peak of acceleration, displacement, and shear stress at their bases [2][3][4].…”

Mô phỏng độ sâu hằn lún vệt bánh xe của mặt đường bê tông nhựa có xét tới tính đàn dẻo nhớt của mô hình vật liệu và phương pháp gia tải

“…Dưới sự phát triển của khoa học kỹ thuật và sự hỗ trợ của máy tính, mô phỏng số theo phương pháp phần tử hữu hạn (PTHH) ngày được sử dụng rộng rãi trong tính toán, thiết kế kết cấu công trình trong đó có mặt đường nhựa. Độ phức tạp cũng như tính chính xác của mô hình ngày được cải thiện qua việc sử dụng các mô hình tải trọng phức tạp và các mô hình vật liệu có xét tới tính đàn nhớt (viscoelastic) [7][8][9][10] hay kết hợp cả tính đàn hồi-nhớt và dẻonhớt (viscoplastic) trong quá trình khai thác [11][12][13][14][15]. Việc đánh giá và dự báo hư hỏng của kết cấu áo đường mềm bằng phương pháp PTHH cho kết quả ngày một chính xác hơn và tốt hơn phương pháp thí nghiệm khi xét tới tính kinh tế và công nghệ đo, tuy nhiên, việc thực hành phương pháp này chưa được thông dụng do tính phức tạp trong việc xây dựng và sử dụng mô hình.…”

Analysis of Tire‐Pavement Contact Morphology Characteristics during the Virtual Track Train Maneuvering

“…Consequently, based on the finite element method, tire and pavement finite element models were built to analyze the geometric characteristics and three-dimensional stress distribution. Simultaneously, factors including tire types (radial, diagonal, wide base, and dual), tire characteristics (tread pattern, rubber material, and inflation pressure), vehicle running conditions (static, uniform, acceleration, braking, and cornering), vehicle loads (unload, full-load, and overload), pavement (type, material, and texture), and temperature were investigated [13][14][15][16][17][18][19].…”