Engineering Practice of Fiber Bragg Grating Retard-Bonded Prestressed Intelligent Tendons
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摘要: 为掌握广东佛山德胜体育中心大跨缓黏结预应力混凝土梁预应力筋的应力变化,采用光纤光栅智慧钢绞线缓黏结预应力智慧筋开展了试验性的监测应用。结果表明:缓黏结智慧筋可在保证施工便利性的同时,可随时获取筋体内预应力大小,准确掌握预应力张拉施工中的预应力损失程度;其监测精度高,能精确反映结构中筋体应力状态伴随施工进程、外界环境、缓凝剂固化作用下的变化,能为缓黏结预应力混凝土工程的设计和施工提供可靠的数据支持。Abstract: To master stress variations in the prestressed tendons of retard-bonded prestressed concrete beams in the Desheng Sports Center of Foshan, Guangdong, retard-bonded prestressed intelligent tendons made of intelligent steel strands with Fiber Bragg Gratings wrapped with steel strands were applied into the engineering monitoring. The results indicated the retard-bonded prestressed intelligent tendons could ensure convenience of construction and measure stress of tendons at any time, accurately grasp actual prestress loss degrees in prestress tensioning construction. It was of high monitoring accuracy and could accurately reflect the changes in stress of the tendons in the structure with the construction processes, the external environment, and the solidification of adhesives. It provided reliable data support for the design and construction quality of retard-bonded prestressed concrete projects.
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