| With the development of high-rise buildings,the use of composite slabs with profiled steel deck and ordinary concrete can solve the problem of excessive weight which is found in ordinary concrete slab.At the same time,the profiled steel plate can be used as a permanent formwork,which can reduce the construction period,but the concrete itself still has the disadvantages of low tensile capacity,low resistance to crack.Meanwhile,the internal steel bar and studs can be exploded and easily corroded after cracking,which makes the overall mechanical performance of the component decrease.At the same time,with the rise and development of emerging materials,carbon fiber has been able to enter the construction industry from the initial aerospace field.By adding a certain amount of chopped carbon fiber into ordinary concrete,the compressive capacity of concrete can be slightly improved,at the same time,the tensile capacity and ductility can be largely enhanced.Because of the light weight and excellent corrosion resistance of the carbon fiber,the corrosion resistance of the carbon fiber reinforced concrete can also be improved and the overall weight will not increase with the mixing of fiber.Therefore,in this paper,the flexural behavior of the composite slab with profiled steel sheeting and carbon fiber reinforced concrete is studied.Based on the bending experiments of seven composite slabs with profiled steel deck and carbon fiber reinforced concrete,the effects of carbon fiber’s volume ratio,thickness of composite slab and profiled steel sheeting on the mechanical properties of the members are studied.According to results of experiments and numerical simulation,the influence of different shear span length,the diameter and spacing of steel bars on the flexural performance of members are studied.The conclusions are described as follows:1.For the cube compressive strength of carbon fiber reinforced concrete,with the increase of carbon fiber’s volume ratio,the strength of test block decreases.The compressive strength of test block of 0.6% volume ratio is even lower than that of ordinary concrete.For composite slabs,with the increase of volume fraction of carbon fiber,the ultimate bearing capacity of members decreases.Compared with 0.2% volume fraction and 0.4% and 0.6% volume fraction,the ultimate bearing capacity of members decreases by9.81% and 13.64% respectively.2.The ultimate bearing capacity of the member increases significantly with the increase of the thickness of the steel plate.The thickness of 1.0 mm and 1.2 mm is 12.51% and 34.78%higher than that of 0.8 mm.3.The ultimate bearing capacity of the component increases with the increase of the total thickness of the composite floor.The thickness of 140 mm and 150 mm is 4.16% and 10.15%higher than that of 130 mm.4.Through the simulation analysis,the increase of the diameter of the distributed steel bars and the decrease of the spacing between those bars can hardly improve the ultimate bearing capacity.However,the ultimate bearing capacity decreased with the increasement of span length.5.Based on the results of full-scale test and finite element analysis,the calculation formula of ultimate bearing capacity which considering the contribution of tensile properties of carbon fiber and the restraint effect of profiled steel sheeting is proposed by linear fitting method. |
