FRP in China

Feng, Peng; Tan, Zhiming; Ye, L; Hu, Wendy; N, Zhang; Qian, P; Lin, Lian-Shin; Yang, Yi; Huang, Yuesheng; Li, R; Yue, Qzq; Lu, X.S.; Yang, Tae-Seon

doi:10.1201/9780203970850.ch9

Cited by 4 publications

(1 citation statement)

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“…Carbon fiber reinforced polymer (CFRP) is widely used to strengthen concrete structures because of high strength, light weight, good corrosion resistance and easy cutting. Pasting circumferentially CFRP strips is commonly used to strengthen RC columns, which can improve the bearing capacity and does not change significantly axial stiffness of the structural members [1][2][3][4]. However, the strip does not work before a new load is applied on the column due to the lagged strain.…”

Section: Introductionmentioning

confidence: 99%

Stress Loss of Pre-Tensed CFRP Strips Strengthening Square RС Column

Zhao

Shi²,

et al. 2021

KEM

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Pre-tensing the CFRP strip strengthening RC column can improve the strain lag of the confined concrete and avoid unloading of column in advance. The pre-stress of strip has an important influence of strengthen. Stress loss of the strip pre-tensed by using the device proposed were investigated by using an experimental test. Firstly, the reasons for the stress loss of strip were analyzed according to the working principle of the device and the strengthening procedure. Then the primary causes of the stress loss, such as friction, relaxation and removing device, were experimentally tested. The influence of the pretension, detail and sectional geometric dimension on the stress loss of the strip were studied. The results show that all three types of pre-stress losses increase significantly with the initial stress. Increasing the cross-sectional size would reduce the relaxation and unwinding losses, but it has little effect on friction losses. The influence of fillet radius on the pre-stress loss was negligible, but in order to avoid premature tearing of local CFRP caused by stress concentration, the chamfer should be made as large as possible within the thickness of concrete protective cover. The test also found that friction was the main cause of stress loss, and friction loss accounts for more than 90% of the total loss.

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Section: Introductionmentioning

confidence: 99%