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（1 北京市建筑工程研究院有限責任公司，北京 100039；2 北京交通大學，北京 100081）
[摘要] 結合了無粘結技術施工簡便和有粘結技術安全可靠特點的緩粘結預應力技術得到了較大的關注，并開始在實際工程中獲得應用?？紤]到預應力技術多應用于重要基礎設施，其結構事故將給人民生命和財產(chǎn)帶來災難性后果，因此對預應力筋的預應力狀態(tài)進行監(jiān)測是十分必要的。不幸的是由于傳感器本身問題和布設工藝的限制，現(xiàn)有監(jiān)測用傳感器仍無法滿足實際工程的需要。本文從緩粘結預應力混凝土結構和光纖傳感技術的特點出發(fā)，設計制作了可實現(xiàn)對自身預應力狀態(tài)監(jiān)測的新型緩粘結智能鋼絞線，并通過系列實驗考察其力學和傳感性能。結果表明：新型自監(jiān)測緩粘結智能鋼絞線具有滿足實際工程長期監(jiān)測需要的力學和傳感性能：其極限抗拉強度大于1660MPa，約為普通鋼絞線的88％；彈性模量為170GPa左右；傳感測試總精度約為2.67％。
[關鍵字] 緩粘結鋼絞線;預應力損失;監(jiān)測評估;光纖傳感
中圖分類號：TU378 文獻標識碼：A 文章編號：1002-848X(2013)S1-1471-04
*國家自然科學基金（50978079）。
作者簡介：蘭春光，博士，博士后，Email:lcg9801121@163.com。
Development of novel self-monitoring retard-bonded smart prestressed steel strand
Lan Chunguang1,2，Liu Hang1
（1 Beijing Building Constitute Research Institute，Beijing 100039；2 Beijing Jiaotong University，Beijing 100081）
Abstract：Combined simplicity of unbounded prestressed technique and safety of bonded prestressed technology, the retard-bonded prestressed technology has been great concerned and used in practical engineering. Considering that retard-bonded technology usually been applied to critical infrastructure, the disastrous consequences would come from the invalidation of prestressed construction. So it is important to monitor the prestressing value of tendons. Unfortunately, there are no sensors and installation process to meet the need of practical engineering because of their disadvantages. In this paper, according to characteristics of retard-bonded prestressed concrete and optical fiber sensing, novel self-monitoring retard-bonded smart steel strand was designed and manufactured. Then the mechanical and sensing properties were studied by a series of experiments. The results show that the mechanical and sensing properties of the self-monitoring smart steel strand can fit the long-term monitoring of practical engineering, and the smart steel strand have the ultimate tensile strength of over 1660MPa (88% of common steel strand), the elastic modulus of 170GPa, and the high test precision of about 2.67%.
Keywords：retard-bonded steel strand;loss of prestress;monitoring and evaluation;optical fiber sensor
