Study On The Durability Of Gfrp Tube Concrete Columns Under The Uv Irradition

At present, both at home and abroad, the study on the durability of FRP enhanced component is not very much, GFRP as a new material with high ratio of performance to price, it is worth to study it under irradiation of ultraviolet durability. The experiment takes the GFRP tube concrete column as the research object, respectively producing six fiber laying angle of 0 DEG and 30 DEG 150 x 450 mm columns, and respectively putting the three columns into the water. In order to accelerate the aging, 16 UVA-340 lamps and 12 UVB-313 lamps were installed on the climate box, after 45 days and 90 days out component loading. The tests show that:(1) the effect of ultraviolet aging can obviously affect the ultimate bearing capacity of GFRP tube concrete columns, and the influence of fiber laying angle of 0 degrees compared to fiber laying angle of 30 degrees more;(2) the water environment has greater influence on the ultimate bearing capacity of fiber laying angle of 30 degrees of GFRP tube concrete columns, and the fiber failure developed toward immersion parts;(3) UV and water environment weakened GFRP tube confinement effect on the concrete, the brittleness increases, which reduces the ductility.Using ABAQUS finite element software, only considering the ultimate bearing capacity, change the elastic modulus of GFRP, and the ultimate bearing capacity of the column is changed. Comparing the experimental data, obtain the decrease of elastic modulus of the GFRP material by the ultraviolet radiation.