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发布时间：2019-03-09

论文类型：期刊论文

发表时间：2012-05-01

发表刊物：SENSORS

收录刊物：Scopus、SCIE

卷号：12

期号：5

页面范围：5380-5394

ISSN号：1424-8220

关键字：optical fiber sensor; Brillouin optical time domain analysis (BOTDA); smart steel strand; full-scale prestress loss; prestressed structure with damages

摘要：For the safety of prestressed structures, prestress loss is a critical issue that will increase with structural damage, so it is necessary to investigate prestress loss of prestressed structures under different damage scenarios. Unfortunately, to date, no qualified techniques are available due to difficulty for sensors to survive in harsh construction environments of long service life and large span. In this paper, a novel smart steel strand based on the Brillouin optical time domain analysis (BOTDA) sensing technique was designed and manufactured, and then series of tests were used to characterize properties of the smart steel strands. Based on prestress loss principle analysis of damaged structures, laboratory tests of two similar beams with different damages were used to verify the concept of full-scale prestress loss monitoring of damaged reinforced concrete (RC) beams by using the smart steel strands. The prestress losses obtained from the Brillouin sensors are compared with that from conventional sensors, which provided the evolution law of prestress losses of damaged RC beams. The monitoring results from the proposed smart strand can reveal both spatial distribution and time history of prestress losses of damaged RC beams.