Analysis on pavement shear stress at intersection under a moving non-uniform distributed load(PDF)
长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]
- Issue:
- 2016年06期
- Page:
- 26-31
- Research Field:
- 道路工程
- Publishing date:
Info
- Title:
- Analysis on pavement shear stress at intersection under a moving non-uniform distributed load
- Author(s):
- ZHANG Hong-wei; WANG Xue-ying; LIU Zhen-zheng; CHEN Lu
- 1. Key Laboratory of Road and Traffic Engineering of Ministry of Education, Tongji University, Shanghai 200092, China; 2. Inner Mongolia Communications Construction Engineering Quality Supervision Bureau, Hohhot 010020, Inner Mongolia, China; 3. Beijing Urban Construction Design & Development Group Co. Ltd., Beijing 100037, China
- Keywords:
- Key words: road engineering; intersection; shear stress; finite element; non-uniform distributed load
- PACS:
- U416.217
- DOI:
- -
- Abstract:
- Complex road conditions such as complex traffic, complex acceleration, braking, steering and other different driving conditions of the urban road, such as intersection, parking lot and long downhill sections, bring extremely complex stress state to road surface. The pavement shear stress was analyzed under moving non-uniform load using ANSYS. The decoupling method was used to solve the complex issue of tire contact with road surface. Decoupling decomposed the tire-road interaction into two phases. A pavement was simplified to a rigid surface with the decoupling method, a static load model about a tire contacting with the rigid surface was established and validated by indoor tests to obtain the stress distribution of the contact surface, and then the stress was applied to the semi-rigid pavement model. The influence of load distribution shape and tread pattern were considered in this model, and the maximum shear stress of pavement was analyzed for different speeds and decelerations under the moving horizontal and vertical non-uniform loads. Considering the effect of load distribution and tread pattern, the pavement model was used to analyze the distribution law of maximum shear stress of pavement for different speeds and accelerations. The effect of tire on road surface could produce vertical, horizontal and lateral stress in three directions, and the contact surface of lateral force will significantly affect the road near the road surface stress. The results show that the maximum shear stress of road surface occurs at the edge of both sides of the second pattern under the uniform speed state, which is about 50% higher than that at the midpoint. The maximum shear stress of road surface occurs in the middle of pattern under the deceleration state. The maximum shear stress of pavement occurs at the top layer of asphalt pavement with a distance of about 2-6 cm to road surface under the uniform speed state, which is 20% greater than the shear stress of road surface. The maximum shear stress occurs at the road surface under the deceleration state. The speed and deceleration may both affect the maximum shear stress of pavement, but the influence of deceleration on the shear stress is significant.
Last Update: 2016-12-02