轮迹横向分布对异形钢桥面板疲劳性能的影响

Influence of transverse distribution of the wheel track on fatigue properties of special-shaped steel bridge decks

以温岭市某座异形钢箱梁为研究对象,对车辆在右转弯时轮迹的横向分布进行统计分析,得到其车辆轮迹横向分布概率模型;采用数值模拟方法,分别分析了实测轮迹横向分布及规范(JTG D64—2015)的轮迹横向分布对异形钢箱梁桥面板4种典型疲劳构造细节的疲劳应力幅的影响并进行了比较。结果表明:虽然转弯时轮迹中心线的分布宽度较直行时大,但在某个横向分布区间内表现出更大的集中性;车辆右转弯时,桥面板典型疲劳构造细节的疲劳应力幅受轮迹横向分布的影响十分显著;对于所选取的4种疲劳构造细节,在采用实测轮迹横向分布模型时其等效应力幅均小于规范规定的轮迹横向分布模型的等效应力幅,说明按规范(JTG D64—2015)的轮迹横向分布模型计算偏于安全。

The transverse distribution of the right-hand steering wheels of vehicles on steel decks is studied statistically according to the investigated data from a special-shaped steel box girder bridge.A probability model for the transverse position distribution of vehicle wheels is built.Based on the field survey,the effect of the transverse distribution of vehicle wheels the fatigue stress range of four typical structures selected from special-shaped steel decks is analyzed using the numerical simulation method and compared with the transverse distribution of wheels stipulated in the design code for highway steel bridges in China.The results show that,although the distribution width is wider within a certain zone,the centerline of the right-hand steering wheel track exhibits a greater concentration than that of the straight-going vehicles.When the vehicles on the deck turn right,the stress range of the selected typical structures is significantly affected by the transvers distribution of the wheel track.The equivalent stress range of the four selected structure A,B,C,and D calculated fromthe transverse distribution model is smaller compared with that calculated from the respective model given in the design code.