【摘要】 对第十届中国花卉博览会世纪馆超大跨度自由曲面薄壳预应力混凝土结构进行了施工过程健康监测。在结构中选取关键位置实时监测结构中混凝土的应变，选取结构外圈关键位置的摇摆柱实时监测柱顶位移，实时监测结构顶部关键位置竖向位移，在每根梁的预应力筋张拉端选取一根预应力筋实时监测锚下压力。使用MIDAS软件对该结构的施工过程进行了有限元模拟计算，为施工过程的数据控制提供依据。通过结构健康监测发现结构屋面下沉小于计算值，整体结构偏安全；结构对温度变化较为敏感，受阳光直射后当日应变波动大，覆土后该情况得到改善；缓粘结预应力筋锚下压力损失较大，但工作性能优于无粘结筋。结构施工过程健康监测提供了该展馆主体结构的工作数据，确保了施工阶段结构的安全，保障了结构施工的有序高效进行。更多还原

【Abstract】 The health monitoring during construction of the prestressed concrete thin-shell structure of ultra-large span free-form surface in Century Pavilion of 10 th China Flower Expo was carried out. The key positions of the structure was selected to monitor the real time strain and temperature change in the structure. The swing columns at the key positions on the outer circle of the structure was selected to monitor the displacement at the top of the columns in real time, and monitored the vertical displacement at the key positions on the top of the structure in real time. At the tensioning end of the prestressed tendons of each beam, selected one prestressed tendon to monitor the anchor pressure under the prestressed tendon in real time. MIDAS was used for finite element simulation calculation of the construction process of the structure, which provided a basis for data control and analysis in the construction process. Through the structure health monitoring, it is found that the subsidence of the structure roof is less than the calculated value, and the whole structure is relatively safe. The structure is sensitive to temperature change, and the daily strain fluctuates greatly when exposed to direct sunlight, which became better after covering with soil. The loss of pressure under anchor of prestressed reinforcement with slow bonding is greater, however, the performance of the gently bonded prestressed reinforcement is better than that of the unbonded prestressed reinforcement. Structural health monitoring during construction provided measured data of the main structure of the exhibition hall in working state, which verified the safety of the structure in construction stage and ensured the orderly and efficient construction of the structure.更多还原