某钢结构梁高温切割全过程的监测与分析

STRUCTURAL HEALTH MONITORING AND ANALYZING FOR THE WHOLE HIGH TEMPERATURE CUTTING PROCESS OF A STEEL BEAM

为保证某大型生产车间钢框架平台梁在设备荷载作用下改造过程中的安全性,采用ANSYS软件对改造方案进行了有限元分析,并采用光纤光栅传感器对其改造全过程进行了实时可视化监测。通过钢梁的有限元结构分析以及高温切割过程中钢梁温度场分析,确定了钢梁的切割方案,同时为相应高温环境下的结构实时监测方案设计、传感器的布设以及实时监测预警阀值的设定提供了依据。监测过程中实时获取了现场钢梁的工作状态,并对实时监测数据进行了快速分析和评价,从而判断钢梁的安全性,以保证钢梁切割过程的顺利进行。监测结果表明,根据监测方案可以快速评价钢梁的受力状态,为切割机的前进速度提供指导,同时表明光纤光栅应变和温度传感器完全满足高温环境下的测量要求。可视化监测方案在快速预警方面的成功应用可为类似的结构改造提供结构健康监测依据。

To ensure the safety of cutting process of a steel platform beam subjected to equipment load in a manufacturing workshop, the cutting process is studied by means of finite element analysis and health monitoring using Fiber Brag Grating（FBG） sensors. The cutting plan of the beam is determined through the analysis of the temperature field of the beam at high temperature. The analysis results can also provide information for the design of the structural health monitoring（SHM） system, the layout of the sensors and the threshold value of the alarm system during the real-time monitoring. During the cutting process, the monitored data collected by the SHM system are analyzed in time to estimate the condition of the beam and ensure the success of operation. The monitoring results indicate that the stress states of the beam can be evaluated based on the monitoring plan and provide guidance for the speed of the cutting machine. And the FBG strain sensors and temperature sensors satisfy the requirements of high-temperature operation. The successful application of visual monitoring plan for rapid alert can provide a basis for similar structural transform.