Distributed fibre optic sensing: Reinforcement yielding strains and crack detection in concrete slab during column failure simulation

Buda‐Ożóg, Lidia; Zięba, Joanna; Sieńkowska, Katarzyna; Nykiel, Damian; Zuziak, Katarzyna; Sieńko, Rafał; Bednarski, Łukasz

doi:10.1016/j.measurement.2022.111192

Cited by 20 publications

(16 citation statements)

References 29 publications

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“…The good bonding between the particular layers inside the cable allowed for avoiding the extensive internal slippage in the range of 10,000 µε. However, crack-induced strain values in concrete structures can be even higher [ 63 , 77 ]. In work [ 12 ], where example results from an S-type beam were presented, the slippage in cable C2 was also reported after exceeding 1% with wider cracks.…”

Section: Resultsmentioning

confidence: 99%

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Crack Shape Coefficient: Comparison between Different DFOS Tools Embedded for Crack Monitoring in Concrete

Howiacki

Sieńko

Bednarski

et al. 2023

Sensors

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The article presents research on the performance of different distributed fibre optic sensing (DFOS) tools, including both layered cables and monolithic composite sensors. The main need for the presented research was related to the growing applications of the DFOS techniques for the measurements of cracked concrete structures. There are no clear guidelines on the required parameters of the DFOS tools, which, despite their different designs, are offered for the same purpose (strain sensing). The state-of-the-art review and previous experiences show noticeable differences in the quality of the results depending on the applied DFOS tool. The technical construction of selected solutions was described with its theoretical consequences, and then laboratory tests on full-size reinforced concrete beams were discussed. Beams equipped with embedded tools were investigated in four-point bending tests, causing the formation of multiple cracks in the tension zone along the beams’ length. The results in the form of strain profiles registered by selected DFOS tools were analysed regarding the qualitative (crack detection) and quantitative (width estimation) crack assessment. The comparison between crack-induced strain profiles was based on a new parameter called crack shape coefficient CSC, which could be applied to assess the effectiveness of the particular DFOS tool in crack detection and analysis. It was one of the world’s first research allowing for such direct comparison between the layered and monolithic sensing tools. The summary indicates practical guidelines referring to the preferable design of the tools best suitable for crack measurements, as well as the field proofs based on data from two concrete bridges in Germany.

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Section: Resultsmentioning

confidence: 99%

“…The next requirement is the high-strain range, as local crack-induced strain peaks can achieve even 30,000 µε or more [ 62 , 63 ]. The DFOS tools should withstand such conditions without the fear of breakage.…”

Section: Review Of Dfos-based Toolsmentioning

confidence: 99%

Crack Shape Coefficient: Comparison between Different DFOS Tools Embedded for Crack Monitoring in Concrete

Howiacki

Sieńko

Bednarski

et al. 2023

Sensors

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“…Sensors: (a) arrangement of fiber optic and foil strain gauges 17 and (b) fiber optic on the reinforcing bar.…”

Section: Experimental Programmentioning

confidence: 99%

“…Sensors: (a) scheme with names and locations of fiber optic on the concrete 17 and (b) fiber optic on the concrete.…”

Section: Experimental Programmentioning

confidence: 99%

Experimental research and numerical simulations of the actual response flat slab in case of column loss

Buda‐Ożóg

Zięba

Sieńkowska

et al. 2023

Structural Concrete

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This study reports the influence of tie reinforcement on the load‐bearing capacity of a flat plate slab in a failure situation due to the removal of an edge column. The results are based on numerical model analysis, experimental investigations, and analytical estimation. A numerical model was developed using the ATENA FEM program and validated based on the test results of the materials used. Experimental studies on the edge column removal were carried out for three models of 16 field flat plate slabs with varying degrees of tie reinforcement. Furthermore, the columns removed in Models M1 and M2 were near the corner edge columns, whereas in Model M3, they were the middle edge columns. The behavior of a reinforced concrete flat plate subjected to large deflections was estimated analytically based on the current literature and compared with the results obtained from numerical analyses and experimental investigations. During the experimental investigations, many traditional and modern techniques were used to measure the strains and displacements of reinforcing steel and concrete.

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“…It is analysed that the measuring principle of the vibrating wire crack metre and designs the signal transmission circuit of the vibrating wire crack metre [23]. The TIM_TRGO timing event triggers on‐chip ADC1 interval sampling, the conversion data is moved to the extended buffer SDRAM managed by the FMC peripheral in the form of DMA and processed by FIR band‐pass filtering [24, 25], fast Fourier operation [26, 27], and Kalman filtering [28, 29]. It is calculated with the vibration frequency of the tension after the change of steel wire displacement and then further converted the steel wire displacement according to the calibration value of vibration frequency.…”

Section: Introductionmentioning

confidence: 99%

Research and design of bridge distributed monitoring system based on LoRa technology

Hou

Bao²

2023

IET Wireless Sensor Systems

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Bridges are a kind of infrastructure constructed to save urban space, to relieve traffic congestion, and to show urban modernisation. Therefore, bridge safety has become the focus of social attention. To know the structural condition of the bridge in real‐time, it is necessary to develop an intelligent and efficient bridge health monitoring system. However, the traditional bridge health monitoring system has poor real‐time performance, low efficiency, and a low degree of automation. The development of LoRa technology is expected to improve this situation. In this study, we designed a bridge‐distributed monitoring system based on LoRa technology, which has end nodes, relay nodes, a collect node, and a monitoring centre. In detail, the STM32H743XI processor is combined with the radio frequency SX1268 chip to form the above nodes. Furthermore, the end node contains the pulse vibration excitation circuit, and pick‐up signal conditioning circuit of the vibrating string crack metre, and the signal conditioning circuit of the temperature sensor AD590 and the humidity sensor HM1500LF. Finally, the data preprocessing of sensors and the communication performance of the two‐stage relay network of the LoRa module, which represent the key technologies to effectively and efficiently meet the real‐time monitoring of bridge conditions, are tested and discussed. This distributed monitoring system for the bridge can provide feasible solutions for the application field of bridge monitoring, which is helpful for the daily maintenance management and risk warning decision‐making of bridges.

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Distributed fibre optic sensing: Reinforcement yielding strains and crack detection in concrete slab during column failure simulation

Cited by 20 publications

References 29 publications

Crack Shape Coefficient: Comparison between Different DFOS Tools Embedded for Crack Monitoring in Concrete

Crack Shape Coefficient: Comparison between Different DFOS Tools Embedded for Crack Monitoring in Concrete

Experimental research and numerical simulations of the actual response flat slab in case of column loss

Research and design of bridge distributed monitoring system based on LoRa technology

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