关键词: 道路工程, 钢桥面铺装, 复合结构, 疲劳试验, 浇注式沥青混合料, 损伤速率

Abstract: The gussasphalt mixture is one of the typical paving materials for steel bridge decks. The combined structure of gussasphalt mixture and orthotropic steel bridge deck bears the load of automobile. In order to investigate the influence of material parameters of gussasphalt mixture on the fatigue damage law of composite structure during service of steel bridge, the fatigue test of composite beam with three-point loading was adopted. Load and deformation parameters were collected during the test, and damage variables of composite beams were calculated. The influence degree of material modulus, pavement thickness and load level on fatigue damage of composite beam was analyzed. The results show that under the same deformation conditions, the material with higher modulus improves the pavement stiffness, but its decay speed is faster; the thickness change has a basically linear relationship with the fatigue damage rate of the composite beam, and the load change has a great influence on it. Especially when the initial deflection of the applied load increases from 0.6 mm to 0.8 mm, the fatigue damage rate of the composite beam increases by 180%.

Key words: highway engineering, steel bridge deck pavement, composite structure, fatigue damage test, gussasphalt mixture, damage rate