铁路客站钢结构雨棚智能运维系统应用

Application of Intelligent Operation and Maintenance System forSteel Structure Canopy of Railway Passenger Station

针对铁路房建设备巡检周期长、结果缺乏时效性等缺点,本文提出了一种指导房建设备管理人员日常运维的铁路客站钢结构雨棚监测系统,通过对环境风、温度、应力、振动加速度、列车风压等进行监测,实现钢结构雨棚状态实时展示和分级报警,同时可以分析列车风对钢结构雨棚的影响。系统架构包含感知层、传输层、数据层和应用层。分析实测数据表明:环境风对结构的影响受周边遮挡与建筑布局有关。结构所受日温呈昼高夜低的变化趋势,结构表面温度与环境温度相比存在时滞性,年温度变化呈夏高冬低的变化趋势。钢结构应力变化与以日为周期的温度变化关联性较强,但应力与温度不完全是线性关系,实测应力变化与仿真模拟有差距。钢桁架振动受列车风影响较大,最大风压达130 Pa;檩条跨中竖向振动加速度受檩条与钢桁架连接节点以及钢桁架竖向振动的影响。

Aiming at the shortcomings of railway building management such as long inspection period and lack of timeliness of railway inspection result,a steel structure canopy of railway passenger station monitoring system was proposed,which can guide the managers of building equipment to operate and maintain daily.Through the ambient wind,temperature,stress,vibration acceleration,train wind pressure and other monitoring,it can achieve real-time display of steel structure canopy status and hierarchical alarm,while supporting the impact of train wind on the steel structure canopy analysis.The system architecture includes the perception layer,the transport layer,the data layer and the application layer.The analysis of measured data shows that the impact of environmental wind on the structure is related to the surrounding occlusion and building layout.The daily temperature affected by the structure shows a trend of high day and low night,and there is a time lag between the surface temperature of the structure and the ambient temperature.The annual temperature change shows a trend of high summer and low winter.The correlation between stress changes in steel structures and temperature changes on a daily basis is strong,but the relationship between stress and temperature is not entirely linear,and there is a gap between measured stress changes and simulation simulations.The vibration of the steel truss is greatly affected by train wind,with a maximum wind pressure of 130 Pa.The vertical vibration acceleration of the purlin is affected by the connection nodes between the purlin and the steel truss,as well as the vertical vibration of the steel truss.