In order to study and analyze the vibration response of simply supported box girder bridge-maglev vehicle, a 25 m span simply supported box girder bridge of Changsha Maglev Express was selected as the research object. Field tests were carried out to explore the dynamic response of maglev vehicle running on the bridge. Firstly, the dynamic characteristics of the bridge under the action of medium-low speed maglev train at different speeds were analyzed, and the vibration response of vehicle and bridge was studied at the design speed of 60∼130 km/h. Among them, the longitudinal acceleration of simply supported box girder ranged from 60 km/h to 130 km/h, which increased linearly with the speed of the train and reached the maximum 0.59 m/s². Its longitudinal deflection also increased with the increase in train speed, which reached the maximum 1.605 mm at 130 km/h. When the speed is 130 km/h, the suspension gap of the maglev vehicle was concentrated in the range of 7.24∼11.50 mm. Through the test analysis, this study provides a basis for the vibration response analysis of simply supported box girder bridge-maglev train. It also provides a reference for the modification and formulation of relevant specifications and experimental verification for the acceleration work of medium-low speed maglev train in the future.

中文翻译：

---

长沙磁悬浮列车加速试验简支箱梁桥-磁悬浮列车的振动响应分析。

为了研究和分析简支箱梁桥式磁悬浮车辆的振动响应，选择了长沙磁悬浮快车25 m跨度的简支箱梁桥作为研究对象。进行了现场测试，以探索在桥上行驶的磁悬浮车辆的动力响应。首先，分析了中低速磁悬浮列车在不同速度下的桥梁动力特性，研究了设计速度为60〜130 km / h时车辆和桥梁的振动响应。其中，简支箱梁的纵向加速度在60 km / h至130 km / h的范围内，随列车速度线性增加，最大达到0.59 m / s ^2。。其纵向挠度也随着列车速度的增加而增加，在130 km / h时达到最大1.605 mm。当速度为130 km / h时，磁悬浮车的悬浮间隙集中在7.24〜11.50 mm的范围内。通过试验分析，该研究为简支箱梁桥-磁悬浮列车的振动响应分析提供了依据。同时也为今后中低速磁悬浮列车加速工作的有关规范的修改和制定，实验验证提供参考。