光纤光栅缓粘结智能钢绞线的研制及应用  

Development and application of FBG retard-bonded smart steel strands

作　　者：兰春光[1,2] 王天昊[3] 刘航[2] 欧进萍[4] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100081 [2]北京市建筑工程研究院有限责任公司,北京100039 [3]北京理工大学自动化学院,北京100081 [4]哈尔滨工业大学土木工程学院,哈尔滨150090

出　　处：《哈尔滨工业大学学报》2014年第6期100-104,共5页Journal of Harbin Institute of Technology

基　　金：国家博士后科学基金资助项目(2014M550020);北京市博士后基金资助项目(2013zz-95)

摘　　要：针对缓粘结钢绞线应力监测用传感器和布设工艺的缺陷,本文基于光纤光栅传感技术特性,综合考虑缓粘结预应力钢绞线的结构,设计制作了一种可实现预应力状态自监测的光纤光栅缓粘结智能钢绞线.并将其应用于某礼堂改造工程缓粘结预应力混凝土单向楼板内,验证了新型光纤光栅缓粘结智能钢绞线的有效性和可靠性.结果表明:该缓粘结智能钢绞线结构简单、机理明确;与普通钢绞线相比其力学性能有所下降,极限抗拉强度约为普通钢绞线的88%;其主要传感性能指标,如迟滞、重复性、线性度、总精度等均小于3%.通过实际工程验证了该新型智能钢绞线施工工艺简单易行,鲁棒性能够满足实际工程预应力损失长期监测.In this paper, in order to solve the defects of sensors and distributed process for monitoring the stress of retard-bonded steel strand, 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 FBG retard-bonded smart steel strand were applied to a retard-bonded prestressed one-way slab in a Hall, and the availability and reliability of the novel smart steel strands was verified. The results show that the retard-bonded smart steel strands have simple structure and definite mechanism. The mechanical properties of the smart steel strand are lower than ones of ordinary steel strand, and the smart strand has the uhimate tensile strength of about 88% of common strand, and the sensing properties （ hysteresis, repeatability, linearity, and total accuracy） are less than 3%. It has been verified that the novel smart steel strand have the advantages of simple and easy construction process by the application in the practical project. And the robustness of the novel smart strand can meet the long-term monitoring for prestress losses in the practical engineering.

关 键 词：光纤光栅 缓粘结钢绞线 预应力损失 监测评估 

分 类 号：TU378[建筑科学—结构工程]