Guo Xiangrong, Liu Jianghao, Cui Ruibo
School of Civil Engineering, Central South University, Changsha 410083, China.
Materials (Basel). 2024 Sep 5;17(17):4387. doi: 10.3390/ma17174387.
Elevated stations are integral components of urban rail transit systems, significantly impacting passengers' travel experience and the operational efficiency of the transportation system. However, current elevated station designs often do not sufficiently consider the structural dynamic response under various operating conditions. This oversight can limit the operational efficiency of the stations and pose potential safety hazards. Addressing this issue, this study establishes a vehicle-bridge-station spatial coupling vibration simulation model utilizing the self-developed software GSAP V1.0, focusing on integrated station-bridge and combined station-bridge elevated station designs. The simulation results are meticulously compared with field data to ensure the fidelity of the model. Analyzing the dynamic response of the station in relation to train parameters reveals significant insights. Notably, under similar travel conditions, integrated stations exhibit lower vertical acceleration in the rail-bearing layer compared to combined stations, while the vertical acceleration patterns at the platform and hall layers demonstrate contrasting behaviors. At lower speeds, the vertical acceleration at the station concourse level is comparable for both station types, yet integrated stations exhibit notably higher platform-level acceleration. Conversely, under high-speed conditions, integrated stations show increased vertical acceleration at the platform and hall levels compared to combined stations, particularly under unloaded double-line working conditions, indicating a superior dynamic performance of combined stations in complex operational scenarios. However, challenges such as increased station height due to bridge box girder maintenance, track layer waterproofing, and track girder support maintenance exist for combined stations, warranting comprehensive evaluation for station selection. Further analysis of integrated station-bridge structures reveals that adjustments in the floor slab thickness at the rail-bearing and platform levels significantly reduce dynamic responses, whereas increasing the rail beam height notably diminishes displacement responses. Conversely, alterations in the waiting hall floor slab thickness and frame column cross-sections exhibit a minimal impact on the station dynamics. Overall, optimizing structural dimensions can effectively mitigate dynamic responses, offering valuable insights for station design and operation.
高架车站是城市轨道交通系统的重要组成部分，对乘客的出行体验和交通系统的运营效率有着重大影响。然而，目前的高架车站设计往往没有充分考虑各种运营条件下的结构动力响应。这种疏忽可能会限制车站的运营效率，并带来潜在的安全隐患。针对这一问题，本研究利用自主开发的软件GSAP V1.0建立了车-桥-站空间耦合振动仿真模型，重点研究了车站-桥梁一体化和车站-桥梁组合式高架车站设计。将仿真结果与现场数据进行了细致比较，以确保模型的准确性。分析车站相对于列车参数的动力响应得出了重要见解。值得注意的是，在相似的运行条件下，与组合式车站相比，一体化车站在轨道承载层的垂直加速度较低，而站台层和大厅层的垂直加速度模式则表现出不同的行为。在较低速度下，两种类型车站的车站大厅层垂直加速度相当，但一体化车站的站台层加速度明显更高。相反，在高速条件下，与组合式车站相比，一体化车站在站台层和大厅层的垂直加速度增加，特别是在空载双线运行条件下，这表明组合式车站在复杂运营场景中具有更好的动力性能。然而，组合式车站存在诸如因桥梁箱梁维护导致车站高度增加、轨道层防水和轨道梁支撑维护等挑战，需要对车站选型进行综合评估。对一体化车站-桥梁结构的进一步分析表明，调整轨道承载层和站台层的楼板厚度可显著降低动力响应，而增加轨道梁高度可显著减小位移响应。相反，候车大厅楼板厚度和框架柱截面的改变对车站动力学的影响最小。总体而言，优化结构尺寸可有效减轻动力响应，为车站设计和运营提供有价值的见解。
