Fatigue Damage Of The Steel Deck Pavement Materials Gussasphalt Based On Combined Structure

With the rapid development of China’s highway, long span steel is playing an increasingly important role in road transport. And the orthotropic steel bridge decks with light weight, short construction period, excellent structural performance characteristics, being increasingly the more big span steel designer of all ages. Gussasphalt because of its excellent anti-aging properties, fatigue resistance, water resistance and the ability to follow the deformation Orthotropic Steel Bridge Decks, it is often used for orthotropic plate pavement. It has an extremely wide range of applications in Europe and Japan, long-span steel bridge deck pavement. After more than ten years of study and practice has proved that the disease on pavement is not just asphalt material performance issues. Because no matter how excellent the material properties, it has its limitations.And the pavement lacks of rigidity support surface be able to offset the material seriously increased performance.Therefore,we study the fatigue properties of Gussasphalt should be combined with the bridge deck.Based on the German and Japanese Gussasphalt performance assessment methods are analyzed, and combined with our climatic conditions and Gussasphalt applications, this study thinks that Germany and Japan use rut dynamic stability to measure Gussasphalt’s thermal stability lacks controllability.So we use the penetration and the penetration degree increments to control Gussasphalt’s thermal stability is more consistent with our situation,and put the technical requirement base on Different climatic zoning. When not more than 60 s to liquidity indicators reflect Gussasphalt workability, requiring 240 ℃In the study fatigue damage of Gussasphalt,we mainly based on the characteristics of orthotropic steel bridge deck pavement was suffered force, and comparative analysis of the domestic and foreign fatigue loading test model and the damage characteristics. In the fatigue properties of paving materials for the purpose of selecting three Southeast University fatigue loading experimental model, and establish of a combination of steel bridge deck pavement structure and The establish of a combination of steel bridge deck pavement structure test model and the real bridge stress characteristics consistent. The model can characterize the structural properties of real orthotropic steel deck pavement system, and reactions of the real steel bridge deck pavement deformation characteristics. This model can be unified, fast, and effective assessment of the fatigue properties of pavement system. Then use Chaboche and Lemaitre proposed fatigue damage evolution model, Starting deduced single beam of rectangular cross-section with asphalt fatigue life model from a mechanical point of view of approximation. Then use the equivalent flexural rigidity principle to simplify complex structure as a single rectangular cross-section beams, make sheets equivalent to the asphalt pavement added to the rectangular cross-section beams, then deduced fatigue life model of the composite structure. Shaped by a combination of laboratory test model structure, the use of UTM-100 servo-hydraulic fatigue testing asphalt dynamic fatigue test system, and collect relevant data. The experimental data were analyzed and collated on a theoretical model for composite structures in fatigue life parameters were fitted to solve, and finally improve the fatigue life of the composite structure model.