软土地区城际铁路桥上救援疏散结构优化研究

Research on Optimization of Rescue and Evacuation Structure on Intercity Railway Bridge in Soft Soil Area

由于长三角地区存在较厚的软土层,桥上救援疏散设施往往会出现结构振动现象,主要原因是桥上救援疏散结构比较柔,再叠加软基效应,结构自振频率与行人步伐频率相近,极易造成桥上救援疏散结构超越舒适度要求的横向晃动问题。文章以南沿江城际铁路桥上救援疏散设施为研究对象,通过对桥上救援疏散设施进行结构调整优化、成本对比分析,提出了适合软土地区城际铁路桥上救援疏散设施的具有技术可行性及经济性的结构方案,满足了以人为本、结构安全、舒适疏散、方便救援的要求。

Due to the thick soft soil layer in the Yangtze River Delta region,structural vibration often occurs in the rescue and evacuation facilities on the bridge.The main reason is that the rescue and evacuation structure on the bridge is relatively soft,and the soft foundation effect is superimposed.The natural vibration frequency of the structure is similar to the pedestrian’s pace frequency,which is easy to cause the lateral shaking problem of the rescue and evacuation structure on the bridge beyond the comfort requirements.This paper takes the rescue and evacuation facilities on the intercity railway bridge along the south Yangtze River as the research object.Through the structural adjustment and optimization and cost comparison analysis of the rescue and evacuation facilities on the bridge,this paper puts forward a technically feasible and economical structural scheme for rescue and evacuation facilities on intercity railway Bridges in soft soil areas,which meets the requirements of people-oriented,structural safety,comfortable evacuation and convenient rescue.