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Structural Engineering and Mechanics Volume 47, Number 4, August25 2013 , pages 531-544 DOI: https://doi.org/10.12989/sem.2013.47.4.531 |
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Effects of traffic characteristics on pavement responses at the road intersection |
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Qun Yang and Jingwang Dai
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| Abstract | ||
| Compared with pavement structures of ordinary road sections, pavement structures in the intersection are exposed to more complex traffic characteristics which may exacerbates pavement distresses such as fatigue-cracking, shoving, shear deformation and rutting. Based on a field survey about traffic characteristics in the intersection conducted in Shanghai China, a three dimensional dynamic finite-element model was developed for evaluating the mechanistic responses in the pavement structures under different traffic characteristics, namely uniform speed, acceleration and deceleration. The results from this study indicated that: (1) traffic characteristics have significant effects on the distributions of the maximum principal strain (MPS) and the maximum shear stress (MSS) at the pavement surface; (2) vehicle acceleration or deceleration substantially impact the MPS and MSS at pavement surface and could increase the magnitude of them by 20 percent to 260 percent; (3) in the vertical direction, with the increase of vehicle deceleration rate, the location of the MPS peak value and the MSS peak value changes from the sub-surface layer to the pavement surface. | ||
| Key Words | ||
| intersection area; traffic characteristic; dynamic finite element; maximum principal strain; maximum shear stress | ||
| Address | ||
| Qun Yang and Jingwang Dai : Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, Shanghai 201804, China | ||