Abstract
The use of external reinforcement based on carbon fibers is technically and economically justified to strengthen concrete structures, which is confirmed by years of experience. The use of this method of reinforcement for masonry structures has significantly less history and, accordingly, experience. However, experimental and site specific efficacy of the use of external reinforcement in the amplification of the pillars of masonry by the device holder has been proven. The experiments of strengthening of a brickwork carried out earlier, as well as the developed theory of calculation, concern application of a full-bodied brick. Given the volume of construction of large-format ceramic stone, the task of strengthening structures from it becomes more urgent every year. In order to solve this problem, the present experimental studies were carried out – experimental studies of the clip effect on the fragments of brickwork with the strengthening of the external reinforcement system based on carbon fibers. In addition to studies of the influence of the size of bricks and the presence of voids, there was a study of the possibility of strengthening the samples with a cross-section size ratio of more than 2. In this case, carbon through anchors were mounted in the Central part of the samples. The test results obtained characters of destruction of specimens, the ultimate load-bearing capacity, made the appropriate conclusions.
Highlights
The use of external reinforcement based on carbon fibers is technically and economically justified to strengthen concrete structures, which is confirmed by years of experience
Measurement of deformations was carried out using indicating gages with divisions of 0.01 mm. the Tests were carried out according to the method adopted for reinforced concrete structures according to GOST 8829-94
The bearing capacity of the experimental samples of the I-series piers mounted from large-format ceramic stones and reinforced with carbon strips 300 mm wide increased by 26% compared to the non-violent reference samples
Summary
- to estimate the effect of the method of strengthening of centrally and extra-centrally compressed stone piers and pillars with the aspect ratio a / b ≤ 2 and a / b > 2 using carbon tape on their bearing capacity;. Prototypes of fragments of walls and columns were made of ceramic bricks and stones: - ceramic hollow brick (voidness 41.1%) PORONORM 1 (1 NF) - Fig. 1 a; - ceramic large-format stone (voidness 54%) POROMAX 280 (12.3 NF) – Fig. 1 b; - full-bodied ceramic brick-rice. 1.1 c
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