Performance of industrial wedge-anchors for pre-stressing BFRP bars: Experimental and numerical studies

Motwani, Prashant; Perogamvros, Nikolaos; Taylor, Su; Laskar, Arghadeep

doi:10.1016/j.compstruct.2020.112592

Cited by 13 publications

(11 citation statements)

References 22 publications

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“…The evidence shows that prestressed BFRP reinforced elements have improved stiffness, approaching or surpassing that of steel reinforced elements with the same reinforcement ratio at levels of prestress over 30% of the ultimate tensile capacity of the bars. Due to the anisotropy of the mechanical properties of BFRP, the anchorage of tendons is also an area of high importance, especially for prestressing applications; issues such as slipping or crushing of the tendons have been reported when using industrial wedge anchorage (Dal Lago et al 2017;Motwani et al 2020) (Dal Lago et al 2017;Motwani et al 2020).…”

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confidence: 99%

Short- and Long-Term Prestress Losses in Basalt FRP Prestressed Concrete Beams under Sustained Loading

et al. 2022

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The favourable mechanical properties of basalt fibre-reinforced polymer (BFRP) bars, such as their excellent strength-to-weight ratio, resistance to corrosion, lower environmental impact and electromagnetic neutrality, make them attractive for internal reinforcement of concrete elements with specific service requirements. Prestressing has emerged as a possible method for limiting the deflections and cracking of BFRP reinforced flexural RC elements. However, long-term behaviour of such structural members has not yet been investigated extensively. Therefore, this paper aims to give information on long-term behaviour and prestress losses of pretensioned BFRP reinforced concrete beams based on the collected experimental data. The testing programme includes long-term analysis of six BFRP concrete beams pretensioned to different prestress levels; namely, 20%, 30% and 40% of the ultimate tensile capacity of the bars. The monitored testing stages included initial tensioning of the bars, casting and curing of concrete, transfer of prestressing force to the concrete, long-term unloaded phase after transfer, sustained loading application, long-term sustained loading phase, unloading and final destructive testing, conducted in a controlled indoor environment. During all phases of the testing strain levels in the BFRP bars and deflections were continuously monitored. The results of continuous strain monitoring show that the average loss of strain over the period of initial 90 days of Journal of Composites for Construction unloaded monitoring was 7% of the initial strain. During the following 6 months of monitoring under sustained loading recorded an additional 0.3% reduction on average. The loss was dependent on the initial strain.

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confidence: 99%

Short- and Long-Term Prestress Losses in Basalt FRP Prestressed Concrete Beams under Sustained Loading

et al. 2022

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“…Wraz ze wzrostem różnorodności materiałów, przeprowadzono kilka badań z wykorzystaniem prętów FRP, GFRP i BFRP. W tych badaniach pręty zamontowano w betonach wzmocnionych włóknami, zamiast normalnego betonu (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35). Kalthoff i Raupach (36) badali wpływ rodzaju betonu, jak również dodatku mikro-włókien ze stali stopowej, na przyczepność.…”

Section: Introductionunclassified

“…As with the recent increase in the material diversity, there were some studies conducted by using FRP, GFRP and BFRP bars and in these studies. These bars were installed in fi ber-reinforced concretes, instead of normal concrete (25)(26)(27)(28)(29)(30)(31)(32)(33)(34)(35). Further, examined the impact of concrete type as well as the addition of micro-alloyed steel fi bers, on the adhesion by Kalthoff and Raupach (36).…”

Section: Introductionmentioning

confidence: 99%

Effect of synthetic zeolite on tobermorite synthesis

et al. 2023

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Chemical anchors are widely used in additional installations of construction irons, repair and reinforcement work. Due to the increasing diversity of materials and the improved awareness of waste products, it has become possible to produce different kinds of concrete, with various properties. In this study, class B420C ribbed bars with 16 mm diameter, were installed in four different concretes by using four different chemical adhesives, and a tensile force was applied. The stiffness, displacement ductility ratio, energy-dissipation capability and tensile force values were determined and the failure modes were interpreted from the load-displacement curves, obtained as a result of the experiments. It was found that the tensile force and energy-dissipation capacity, had increased as a result of installing anchor and applying a tensile force to the concrete, that was obtained by adding admixture materials, to the reference concrete. In the analytical part of the study, the formulation provided in ACI 318 was used, capacity and design strengths were identified, and their safety levels were determined in comparison with the test results.

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“…They have a range of industrial uses in addition to scientific and technological research and development [ 2 ]. Load cells have been providing quality measurements in robotics and automation [ 3 , 4 , 5 ], agriculture [ 6 , 7 ], medicine [ 8 , 9 , 10 ], industrial weighing [ 11 , 12 ], and many other applications for decades [ 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. The load cell can also be used to gauge the interference force in wearable robotic applications (such as exoskeletons and prostheses) or to detect the comparison force as the robot walks to provide information to the stable-controlling system [ 23 , 24 , 25 , 26 , 27 ].…”

Section: Introductionmentioning

confidence: 99%

Design and Shape Optimization of Strain Gauge Load Cell for Axial Force Measurement for Test Benches

Al-Dahiree

Tokhi

Hadi

et al. 2022

Sensors

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The load cell is an indispensable component of many engineering machinery and industrial automation for measuring and sensing force and torque. This paper describes the design and analysis of the strain gauge load cell, from the conceptional design stage to shape optimization (based on the finite element method (FEM) technique) and calibration, providing ample load capacity with low-cost material (aluminum 6061) and highly accurate force measurement. The amplifier circuit of the half Wheatstone bridge configuration with two strain gauges was implemented experimentally with an actual load cell prototype. The calibration test was conducted to evaluate the load cell characteristics and derive the governing equation for sensing the unknown load depending on the measured output voltage. The measured sensitivity of the load cell is approximately 15 mV/N and 446.8 µV/V at a maximum applied load of 30 kg. The findings are supported by FEM results and experiments with an acceptable percentage of errors, which revealed an overall error of 6% in the worst situation. Therefore, the proposed load cell meets the design considerations for axial force measurement for the laboratory test bench, which has a light weight of 20 g and a maximum axial force capacity of 300 N with good sensor characteristics.

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Performance of industrial wedge-anchors for pre-stressing BFRP bars: Experimental and numerical studies

Cited by 13 publications

References 22 publications

Short- and Long-Term Prestress Losses in Basalt FRP Prestressed Concrete Beams under Sustained Loading

Short- and Long-Term Prestress Losses in Basalt FRP Prestressed Concrete Beams under Sustained Loading

Effect of synthetic zeolite on tobermorite synthesis

Design and Shape Optimization of Strain Gauge Load Cell for Axial Force Measurement for Test Benches

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