Fire Performance Research On BFRP Confined Concrete Column

Basalt fiber reinforced polymer(BFRP) has become a focus in the field of strengthening concrete structure, the results show that BFRP can improve the ultimate bearing capacity of concrete columns at room temperature, but in our country, the fire happens easily, and the fire performance research on BFRP reinforced concrete column is not sufficient both at home and abroad. So the fire performance research on BFRP reinforced concrete column is studied.Firstly, through the cross section temperature field of 12 groups specimen,the environment temperature is 200?, 400?, 600?, and 800? respectively,and the temperature is test on surface of concrete column and BFRP inside and outside with different glue, the results show that BFRP has the certain heat insulation ability; BFRP outside temperature and surface temperature of plain concrete column are not identical, it indicates that the integrated heat transfer coefficient are different between BFRP, concrete and environment; The heat insulation performance of BFRP with inorganic glue is superior to the organic.Through the cross section temperature field of 6 groups specimen, the environment temperature is 800 ?, after a constant temperature time, the temperature of BFRP inside and outside surface is test with 2, 3, 4 layers respectively, the results show that changing of BFRP layers are not significantly affected on the cross section temperature field.Secondly, through the bearing capacity test of 15 groups specimen under high temperature, the environment temperature is 200?, 400?, 600?and 800?respectively, under high temperature, the bearing capacity are test of plain concrete column and BFRP reinforced concrete column with different glue, the damage form is summarized of different specimens at different temperatures, and the curve is obtained of concrete compressive strength with the changing temperature, and the factors are analyzed of affecting the compressive strength of concrete, including temperature, BFRP constraints and the glue type. Through the test of 6 groups of specimens, the environment temperature is 800 ?, the ultimate compressive strength of concrete is test with 2, 3, 4 layers BFRP respectively, and the results show that the BFRP layer has little effect on thestrength of concrete.Finally, through the comparison of temperature value of numerical calculation and experimental results, the cross section temperature field numerical calculation model is established under different temperature; Based on the section temperature field numerical calculation of plain concrete column and BFRP confined concrete column with inorganic glue or organic glue, the changing rule of temperature field is obtained. Meanwhile, the calculation model of the axial displacement is established, by calculating the axial displacement under different temperature, the changing role with the temperature of specimens is got.