国家会展中心预应力混凝土结构健康监测

Structural health monitoring of the prestressed concrete frame structure in the National Exhibition and Convention Center

对国家会展中心大空间展厅的预应力混凝土框架结构进行了长期的健康监测。通过在结构中埋设应变-温度传感器实时监测结构中混凝土的应变和温度,通过埋设穿心式压力传感器实时监测预应力筋束的锚下有效预压力,锚下预压力在施工时即进行监测,混凝土的应变和温度在1层结构施工初步完成且监测系统安装调试完成后进行测读,均持续监测至混凝土结构施工完成后2.5年。结构健康监测为了解国家会展中心预应力混凝土结构的工作状态提供了实测数据支撑,对于确保施工阶段及使用阶段结构的安全、适用起到了很好的作用,且混凝土应变、温度、预应力束锚下有效压力的实测数据的分析结果对工程实践与研究具有参考意义。

Long-term structural health monitoring of the prestressed concrete frame structures in the National Exhibition and Convention Center was carried out. Strain and temperature of concrete were constantly measured by the strain-temperature sensors embeded in the structure. Effective prestressing force of prestressed bundle was constantly measured by the preset center hole pressure sensors,and the measurement of effective prestressing force began when the tendons were prestressed.While the measurement of strain and temperature was began after the 1 st layer concrete structure was built and the monitoring system was established. All the monitoring continued until nearly 2. 5 years after the concrete structure part were constructioned. Structural health monitoring＇s measured data made it possible to know the working state of the prestressed concrete structure in the National Exhibition and Convention Center,this played an important role in ensuring the structure＇s safety and serviceability both in the construction stage and service stage. Analysis of the measured data of strain,temperature and effective prestressing force would have some referential meaning to the engineering practice and study.