论文部分内容阅读
传统桥梁设计方法中,把交通荷载处理为静载乘以影响因子。依据现行规范,该因子仅是跨度或一阶自振频率的函数。分析各种参数对钢桥动力响应的影响,包括:速度、火车轴距、车轴数、桥跨度,并研究影响因子。计算了火车速度100～400km/h,轴距13～20m,桥跨度10,15,20,25m情况下的动力响应和影响因子。动力分析表明,大多数情况下,算得的影响因子高于相关规范中的值。影响因子随火车速度、火车轴距和桥跨度之比而变化,而车轴数仅在共振时产生影响。给出了速度、车轴距、桥跨度与影响因子的关系。
In traditional bridge design methods, the traffic load is treated as static load times the impact factor. According to current regulations, this factor is only a function of span or first order natural frequency. The influence of various parameters on dynamic response of steel bridge is analyzed, including speed, train wheelbase, number of axles, span of bridge, and the study of influence factors. The dynamic response and influence factors of train speed 100 ~ 400km / h, wheelbase 13 ~ 20m and bridge span 10, 15, 20, 25m are calculated. Dynamic analysis shows that in most cases, the calculated impact factor is higher than the value in the relevant specification. The impact factor varies with the ratio of train speed, train wheelbase and bridge span, while the number of axles only affects resonance. The relationship between speed, wheelbase, bridge span and influencing factors is given.