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The Research for Calculation and Experiment of Internal Force about Asphalt Pavemen and Steel Bridge Deck

Author: LuoBing
Tutor: ShenChengWu
School: Wuhan University of Technology
Course: Structural Engineering
Keywords: Stress concentration Reflective cracking Fatigue life
CLC: U441.5
Type: Master's thesis
Year: 2005
Downloads: 243
Quote: 0
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Abstract


China's highway construction focused on new construction and remodeling of the highway, the understanding of the serious shortage of investment in the existing highway pavement maintenance and technological innovation. According to projections, the cement concrete pavement maintenance and upkeep, and the transformation of the peak is yet to come, in the next few years, this problem will be gradually emerged. Of cement concrete pavement repair more difficult, commonly used measures at home and abroad are mainly two: first paved asphalt concrete surface layer, the second paved concrete surface. Asphalt overlay can effectively improve the use of the old cement concrete pavement performance, improve vehicle comfort and convenient construction, traffic and environmental impact, the most widely used home and abroad old cement concrete pavement reconstruction project, but The fatal weakness of the structure is easy to produce asphalt overlay on old cement concrete seams reflective cracking overlay shorten the service life of. How to control the generation and development of reflective cracking is still a major technical problems facing road engineering. This article first asphalt overlay on the fracture mechanism, this paper, from the point of view of the fracture mechanics analysis of reflective cracking of asphalt overlay mode: shear reflective cracking and spreading reflective cracking. Reflection Crack and expansion mechanism is then analyzed from the point of view of fracture mechanics, think that the the internal reflection cracks in asphalt overlay reason is because of the old concrete pavement cracks or joints as the original defect caused the asphalt overlay of stress concentration and internal damage. Asphalt overlay reflective crack propagation process to go through three stages: crack initiation stage, stable expansion phase rupture stage. For how to prevent and mitigate reflective cracking of asphalt overlay paving grading macadam mitigation layer, and general-purpose finite element software ANSYS, vehicle load of old cement concrete pavement asphalt overlay structure, temperature load, as well as vehicle load and temperature load coupling stress analysis under the joint action. Different conditions, such as shaft deadweight asphalt overlay of the modulus of elasticity, the thickness of the asphalt overlay, foundation modulus graded gravel ease the modulus and the thickness of the layer, as well as the cooling rate, multifaceted computational analysis, a lot of calculated data, mechanics calculations reveal the the Old Cement concrete slab joints (cracks) at the asphalt overlay stress concentration phenomenon, and confirmed the the paving grade with gravel to alleviate the layer can be a good slow reflective cracking. Development of high shear strength and good resistance to high and low temperature performance bonding material is to solve the ruts in the asphalt surface, owned by the package, the passage of key diseases such as. For the new material of the adhesive layer, while ensuring the strength and should have a good anti-fatigue life. Through the test in order to grasp its fatigue life under different stress levels. Learn about the health and performance of the damage.

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CLC: > Transportation > Road transport > Bridges and Culverts > Structural principles, structural mechanics > Stress analysis, thermal stress
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