234 / 2022-06-14 18:27:00

Axial Behavior of CFRP Grid Confined Concrete

CFRP grid, CFRP strips, Confinement, Concrete, Constitutive model

This paper introduces an experimentally study on the axial behaviour of CFRP grids confined concrete cylinders. Total of thirty concrete cylinders were received different CFRP confinement configurations and tested under a monotonic compression loading. The test variables include the CFRP grids layers, concrete strengths and CFRP confinement configurations. The preferred confinement configuration was eventually determined and the effects from the main variables were investigated.  



The test results showed that CFRP grids confinement can provide a superior ductility performance to the ordinary concrete. However, the grid structure leads to a moderate increase in the axial compressive strength of confined cylinder. Excellent results on both strength and ductility improvements can be achieved by providing the combination confinement of CFRP grid and CFRP strips. It is also found that the results from the CFRP grid-CFRP strips configuration was better than the CFRP strips-CFRP grid configuration.



The existing stress-strain model were reviewed in order to determine one rational and accurate model for the confinement behaviour with softening. A stress-strain model for moderate confinement, such as CFRP grid confinement, was proposed. The performance of the proposed model were evaluated by comparing to the test data.