大跨度轨道交通桥梁扭转变形及其限值

偏载作用下大跨度桥梁主梁易产生较大的扭转变形,这对轨道交通车辆运行的安全性和舒适性是不利的。针对大跨度桥梁扭转变形的特点,明确了大跨度桥梁主梁局部扭曲和整体扭转两种变形形式,并结合相关规范的已有规定和公务部门的管理标准,提出了扭转变形限值的取值标准,并通过车—桥耦合振动分析实例验证了主梁扭转变形的不利影响。研究结论可为设计和管理人员提供参考。

Torsional Deformations and Their Critical Values for Long-span Bridges in Rail Transit

Eccentric loadings will induce large torsional deformations for the girders of long-span bridges,deteriorating the safety and comfort of moving vehicles of rail transit. According to their characteristics,torsional deformations of long-span bridges are classified into two types:local twist and bodily torsion. Based on the related specifications and railway management standards,the critical values for the torsional deformations are put forward. An example of coupled vibration of vehicle-bridge system is take...