Temperature measurement and damage detection in concrete beams exposed to fire using PPP-BOTDA based fiber optic sensors

Bao, Yi; Hoehler, Matthew S.; Smith, Christopher M.; Bundy, Matthew F.; Chen, Genda

doi:10.1088/1361-665x/aa89a9

Cited by 50 publications

(28 citation statements)

References 39 publications

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“…Telecommunication-grade, single-mode optical fiber cable with a polymer sheath and aramid yarn was used as a distributed temperature sensor. Figure 4-10 shows the structure of the optical fiber cable for temperature measurement (Bao et al, 2017). The optical fiber has a tight polymer buffer (diameter: 900 μm), a polymer outer coating (outer diameter: 242 μm), a polymer inner coating (outer diameter: 190 μm), a silica (glass) cladding (outer diameter: 125 μm), and a silica (glass) core (diameter: 8.2 μm).…”

Section: Distributed Fiber Optic Sensorsmentioning

confidence: 99%

Compartment fire experiments on long-span composite-beams with simple shear connections part 1:

Ramesh¹,

Choe²,

Seif³

et al. 2019

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A series of compartment fire experiments was conducted on long-span steel-concrete composite floor beams designed and constructed following U.S. building codes and standards. The test program consisted of five 12.8 m long composite floor beam specimens with various end support conditions. Each specimen was constructed as a partially-composite beam consisting of a W18×35 steel beam and an 83 mm thick lightweight concrete slab cast on top of 76 mm deep ribbed steel decking units. Test variables included two types of simple shear connections (shear-tab and welded/bolted double-angle connections) and the slab continuity over girders. One specimen with the double-angle connections at the ends was tested at ambient temperature and the remaining four specimens were tested under simultaneous mechanical and fire loading. This report, Part 1, presents details of the test setup, specimens, design basis of fire loading, instrumentation, and the behavior of the composite beam with double-angle connections at ambient temperature. The ambient temperature test indicated that the composite beam specimen failed by a shear stud near the west end, followed by concrete breakout failure and yielding of the steel beam. The measured moment capacity was approximately 80% of the calculated flexural strength. The double-angle connection at the west end failed by weld fracture, which caused collapse of the composite beam. The ambient behavior of the composite beam specimen presented herein will serve as a baseline to compare with the composite beam assemblies tested under combined mechanical loads and fire exposure, which are presented in a subsequent report; Part 2 (Choe et al. 2019). The datasets obtained from these tests provide technical information to advance performance-based design of composite floor assemblies in steel-framed buildings subject to fire.

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Section: Distributed Fiber Optic Sensorsmentioning

confidence: 99%

Compartment fire experiments on long-span composite-beams with simple shear connections part 1:

Ramesh¹,

Choe²,

Seif³

et al. 2019

Self Cite

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show abstract

“…Different distributed sensors have been used to measure temperatures in small-scale steel and reinforced concrete beams subjected to fire. For example, temperature distributions of a small steel beam exposed to combined fire and mechanical loading were measured and enabled an enhanced thermal–mechanical analysis of the steel beam [ 21 ]; In addition, temperature distributions in a small reinforced concrete beam exposed to fire were measured and enabled detection of cracks in the concrete [ 22 ]. Based on the existing studies, it is rational to hypothesize that distributed fiber optic sensors can be deployed in structures to image three-dimensional temperature distributions and generate digital models of these distributions.…”

Section: Introductionmentioning

confidence: 99%

Measuring Three-Dimensional Temperature Distributions in Steel–Concrete Composite Slabs Subjected to Fire Using Distributed Fiber Optic Sensors

Bao

Hoehler

Smith

et al. 2020

Sensors

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Detailed information about temperature distribution can be important to understand structural behavior in fire. This study develops a method to image three-dimensional temperature distributions in steel–concrete composite slabs using distributed fiber optic sensors. The feasibility of the method is explored using six 1.2 m × 0.9 m steel–concrete composite slabs instrumented with distributed sensors and thermocouples subjected to fire for over 3 h. Dense point clouds of temperature in the slabs were measured using the distributed sensors. The results show that the distributed sensors operated at material temperatures up to 960 °C with acceptable accuracy for many structural fire applications. The measured non-uniform temperature distributions indicate a spatially distributed thermal response in steel–concrete composite slabs, which can only be adequately captured using approaches that provide a high density of through-depth data points.

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“…In recent decades, distributed Brillouin optical time domain analyzer (BOTDA) has been intensively investigated for a wide variety of applications, including temperature analysis [1,2] and structure health monitoring [3,4]. It's capability to provide highly precise and distributed measurements of strain and temperature profiles has been demonstrated [5,6].…”

Section: Introductionmentioning

confidence: 99%

Fast Frame Synchronization Design and FPGA Implementation in SF-BOTDA

et al. 2020

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To address the issues of high time consumption of frame synchronization involved in a scanning-free Brillouin optical time-domain analysis (SF-BOTDA) system, a fast frame synchronization algorithm based on incremental updating was proposed. In comparison to the standard frame synchronization algorithm, the proposed one significantly reduced the processing time required for the BOTDA system frame synchronization by about 98%. In addition, to further accelerate the real-time performance of frame synchronization, a field programmable gate array (FPGA) hardware implementation architecture based on parallel processing and pipelining mechanisms was also proposed. Compared with the software implementation, it further raised the processing speed by 13.41 times. The proposed approach could lay a foundation for the BOTDA system in the field with the associated high real-time requirements.

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Temperature measurement and damage detection in concrete beams exposed to fire using PPP-BOTDA based fiber optic sensors

Cited by 50 publications

References 39 publications

Compartment fire experiments on long-span composite-beams with simple shear connections part 1:

Compartment fire experiments on long-span composite-beams with simple shear connections part 1:

Measuring Three-Dimensional Temperature Distributions in Steel–Concrete Composite Slabs Subjected to Fire Using Distributed Fiber Optic Sensors

Fast Frame Synchronization Design and FPGA Implementation in SF-BOTDA

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