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发布时间：2019-03-09

论文类型：期刊论文

发表时间：2011-02-01

发表刊物：ADVANCES IN STRUCTURAL ENGINEERING

收录刊物：EI、SCIE、Scopus

卷号：14

期号：1,SI

页面范围：67-78

ISSN号：1369-4332

关键字：scour monitoring; optical fiber Bragg grating sensor; uniform-strength beam; fiber-reinforced polymer; sensing property

摘要：This paper proposes an optical fiber Bragg grating (FBG) sensing system for scour monitoring around the foundations of bridge piers and abutments. The new system introduces a uniform-strength fiber-reinforced polymer (FRP) beam that is instrumented with two FBG sensors in two sides of its neutral axis. The tensile and compressive strains of the beam are measured under a hydrodynamic pressure as water flowing around bridge foundations. By assuming equal temperatures around the uniform-strength beam, the difference in wavelength variations of the two embedded FBG sensors was found to be proportional to the square of flow velocity, which is directly related to scour. A prototype scour sensing system was designed and fabricated to test its sensing property in the laboratory. The experimental results indicate that the proposed system is sensitive to flow change and further monitor the scour process effectively, without responding to its surrounding hydrostatic and soil pressures.