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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。
In order to ensure the safety of the steel frame platform beam in a large production workshop during the process of equipment load transformation, the finite element analysis of the reconstruction program was carried out by using ANSYS software. The whole process of the reconstruction was monitored by using the fiber grating sensor in real time. Through the finite element analysis of the steel beam and the temperature field analysis of the steel beam during the high-temperature cutting process, the cutting scheme of the steel beam is determined. At the same time, the design of the real-time monitoring program of the structure under high temperature, the layout of the sensor and the real- Set provided a basis. During the monitoring process, the working condition of on-site steel beams was acquired in real time, and the real-time monitoring data were quickly analyzed and evaluated to judge the safety of the steel beams so as to ensure the smooth progress of the steel beam cutting process. The monitoring results show that the monitoring program can quickly evaluate the stress state of the steel beam and provide guidance for the cutting speed of the cutting machine. At the same time, the FBG strain and temperature sensor fully meet the measurement requirements in high temperature environment. The successful application of visual monitoring programs to rapid early warning provides the basis for structural health monitoring for similar structural modifications.