为了改善目前常用的钢箱梁铺装柔性铺装在使用过程中容易出现铺装层开裂、脱粘、车辙、坑槽等病害的问题,结合成都市东西城市轴线绕城高速节点钢箱梁桥工程,对常用的钢箱梁柔性铺装和刚性铺装(45 mm超高韧性混凝土+50 mm SMA铺装和钢纤维混凝土+沥青混凝土铺装)进行分析,对比不同铺装形式下桥面板的刚度、主梁应力和单位面积造价。结果表明:采用钢纤维混凝土+沥青混凝土铺装方案,可以改善桥面板局部受力状况,降低钢桥面疲劳开裂及铺装层开裂、车辙等风险,降低工程造价。
To enhance the serviceability of steel bridge deck pavement(SBDP)in high-temperature and rainy regions,a concept of rigid bottom and flexible top was summarized using engineering practices,which led to the proposal of a three-layer ultra-high-performance pavement(UHPP).The high-temperature rutting resistance and wet-weather skid resistance of UHPP were evaluated through composite structure tests.The internal temperature distribution within the pavement under typical high-temperature conditions was analyzed using a temperature field model.Additionally,a temperature-stress coupling model was employed to investigate the key load positions and stress response characteristics of the UHPP.The results indicate that compared with the traditional guss asphalt+stone mastic asphalt structure,the dynamic stability of the UHPP composite structure can be improved by up to 20.4%.Even under cyclic loading,UHPP still exhibits superior surface skid resistance compared to two traditional SBDPs.The thickness composition of UHPP significantly impacts its rutting resistance and skid resistance.UHPP exhibits relatively low tensile stress but higher shear stress levels,with the highest shear stress occurring between the UHPP and the steel plate.This suggests that the potential risk of damage for UHPP primarily lies within the interlayer of the pavement.Based on engineering examples,introducing interlayer gravel and optimizing the amount of bonding layer are advised to ensure that UHPP possesses sufficient interlayer shear resistance.
