桥面铺装温度对正交异性钢桥面板疲劳的影响

Influence of temperature of pavements on fatigue life of orthotropic steel bridge deck

摘要:

国内外许多学者都对正交异性钢桥面板的疲劳性能进行了研究，取得了丰硕的成果。但到目前为止，鲜有学者研究桥面铺装温度对钢桥面板疲劳的影响。本文通过带桥面铺装的正交异性钢桥面板足尺模型疲劳试验，实测了不同桥面铺装温度条件下钢桥面板的受力情况，分析研究了桥面铺装温度对钢桥面板疲劳损伤度的影响。结果表明：沥青混合料钢桥面铺装刚度会随着温度升高迅速降低，导致铺装层下的正交异性钢桥面板受力迅速增加；在相同的荷载条件下，高温（55℃）条件下钢桥面板疲劳损伤度约为常温（10℃）的21倍。

Abstract:

Many scholars have studied the fatigue performance of orthotropic steel bridge decks and got fruitful achievements, but so far, few scholars have discussed the influence of pavements’ temperature on fatigue life of steel bridge deck. In this paper, actual stresses of the steel bridge deck were measured through fatigue test with full-scale model in different temperature conditions. The results showed that stiffness of the asphalt mixture reduced quickly with the increasing of temperature, and resulting in rapid increasing of stresses of orthotropic steel bridge deck under the pavement. The fatigue damage of the steel bridge deck at high temperature(about 55℃) condition is approximately 21 times at room temperature(about 10℃) under the same load conditions.