Experimental and calculated evaluation of carbon fiber reinforcing for increasing concrete columns carrying capacity

Abstract

The article presents the concrete columns tests results reinforced with canvases based on carbon fibers FibARM Tape 530/300 and FibARM Lamel 14/100 slats, the calculation of the use effectiveness for strengthening the compressed reinforced concrete elements. Three groups of columns were tested: unreinforced columns, columns reinforced with FibARM Tape 530/300 canvases in one layer, reinforced with FibARM Lamel 14/100 lamella (width is 100 mm), while one of the samples was reinforced with lamella only, and the other was reinforced both lamella and clamps. In addition, it was proposed calibration calculation of concrete columns reinforced with canvases based on carbon fibers FibARM Tape 530/300, the calculation purpose was to determine the bearing capacity for evaluating the suitability in the further structure operation after columns strengthening. According to the experiment results, data were obtained on the carrying capacity of centrally compressed concrete columns reinforced with carbon fiber both with a discrete arrangement of bands (strips) made of composite material along the height of the structures, as well as with their continuous wrapping (analogue of reinforced concrete holder). According to the experiment results, data were obtained on the carrying capacity of centrally compressed concrete columns reinforced with carbon fiber, both with a discrete arrangement of bands (strips) made of composite material along the height of structures, and with their continuous wrapping (analogue of reinforced concrete holder).

Reserves and exposure assessment of reinforced concrete structures safety while reducing its power resistance

“…At the moment of internal forces coincidence and force resistance, the reinforced concrete element is destroyed. The force resistance is equal to zero, which is equivalent to an impulsive application of a reverse sign force in the fracture cross section and equal in value to the previous residual force [28][29][30].…”

“…Next, the maximum allowable load is calculated. (27) and correspondingly (28) or (29) B. Damaged identical columns with various supporting anchors are considered.…”

Assessment of the Impact of High Temperature on the Strength of Reinforced Concrete Structures during Operation

“…During the technical examination of structures exposed to temperature effects, the following were established: appearance, color, solidity, presence of foreign inclusions, surface looseness, cavities, shells, voids, opening width and depth of cracks, corrosion of reinforcement and concrete, chips and abrasion of the concrete surface [19][20][21][22][23][24][25][26][27].…”

Residual resource of power resistance during building structures deformation

“…Real reinforced concrete structures, especially those of environmental protection, communication and communal use, have an increased risk degree of unacceptable damage caused by technogenic or biological aggressive effects (the effect is considered as corrosion damage). The problem of ensuring the state of fracture toughness (absence of cracks) for a specified period of time has the problem of predicting the moment of cracks occurrence in the stretched zones of reinforced concrete elements with the maximum in terms of quantity and significance factors of strength and corrosion content [10][11][12][13][14][15][16][17][18].…”