基于动力特性分析的大跨度钢网架振动健康监测应用研究

Research on the Application of Vibration Health Monitoring for Long-Span Steel Space Frames Based on Dynamic Characteristics Analysis

既有体育场馆的结构健康问题是当下建筑结构可持续发展的痛点和热点。尤其是对于大跨度钢网架结构,研究其振动响应特性对于结构健康状况的判别具有重要的现实意义。对某既有大跨度体育馆钢网架进行实时振动监测,通过识别钢网架在不同工况下的模态频率等结构动力特性参数,并与考虑附加恒载的有限元计算模型进行对比。结果表明该实测结构动力特性与有限元模型计算结果吻合较好,监测期间并未发生明显的刚度退化,振动监测达到预期的目的,可以准确反映结构的实际振动情况。本研究可为类似大跨度钢网架结构健康监测提供参考。

The structural health issues of existing stadiums is a critical and widely discussed issue in the sustainable development of building structures at present.Especially for large-span steel grid structures,studying their vibration response characteristics is of great practical significance for determining the health status of the structure.Real time vibration monitoring was carried out on the steel grid structure of an existing large-span sports hall,by identifying the structural dynamic characteristics parameters such as modal frequency under different working conditions of the steel grid structure,and comparing it with a finite element calculation model considering additional dead loads.This indicates that the measured dynamic characteristics of the structure are in good agreement with the finite element model calculation results,and there is no significant stiffness degradation during the monitoring period.Vibration monitoring has achieved the expected purpose,accurately reflecting the actual vibration situation of the structure,and can be used as a reference for health monitoring of similar large-span steel grid structures.