不同运行状态下的城市桥梁标准疲劳车模型研究

Study on Standard Fatigue Vehicle Models for Urban Bridges Under Different Vehicle Motion States

以乌鲁木齐市某高架桥获取的3个月实地车辆拥堵荷载数据为基础,采用等效损伤原则计算了由原始车辆荷载谱等效得到的疲劳车加载到1.5～100m简支梁和30m+30m+30m连续梁桥产生的疲劳损伤占比,推导了适用于乌市一般运行状态下的标疲车。此外,选取了两种频发的怠速拥堵工况,按"总重不变,合并轴重"原则分别近似等效为3轴和4轴疲劳车,并计算了加载到1.2～50m简支梁上产生的疲劳损伤占比,推导了适用于乌市拥堵状态下的标疲车。最后,对比分析了一般运行状态和拥堵状态下以及国内外的标疲车对桥梁造成的疲劳损伤随桥梁跨径变化的差异和规律。

Based on the 3-month field vehicle congestion load data obtained from a viaduct in Urumqi,the equivalent damage principle is adopted to calculate the proportion of fatigue damage caused by the fatigue vehicle loaded by the original vehicle load spectrum to the 1.5~100m simply supported beam and the 30m+30m+30m continuous beam bridge,the standard fatigue vehicle suitable for the general operation status in Urumqi is derived.Additionally,two kinds of frequent idle congestion conditions are selected,which are approximately equivalent to 3-axis and 4-axis fatigue vehicles according to the principle of"constant total weight and combined axle weights".The proportion of fatigue damage generated by loading into the 1.2~50m simply supported beam is calculated,and the standard fatigue vehicle suitable for the congestion state of Urumqi is derived.Finally,the differences and laws of the fatigue damage caused by the standard fatigue vehicle under the general operating state and the congested state to the bridges are comparatively analyzed.