| Textile reinforced concrete(TRC)is a kind of composite material formed by adding fiber into concrete,which has been widely studied and developed in the world.This method can not only enhance the property of concrete structure,but also has the advantages of light weight,strong flexural capacity,high toughness,which makes it widely used in the actual building structure.In this thesis,based on the strengthening mechanism of textile reinforced concrete,the mechanical capacity of carbon textile reinforced concrete are analyzed by ABAQUS finite element method.Based on the analysis of the constitutive model of fiber and concrete and the assumption of adhesion,the relevant experiments are simulated and analyzed to verify the validity and rationality of the model.The flexural and impact behavior of the specimens are studied considering the number of layers,mesh size,braiding type and laying method of the textile.Finally,this thesis simulated and analyzed the interface property of TRC.The following research results are obtained:1.The simulation results of the flexural behavior of the textile reinforced concrete slab are as follows:(1)With the increase of the number of fiber layers laid in the concrete,the flexural load of the whole structure is improved,but the strengthening effect is not obvious.At the same time,it can effectively restrain the possibility of the sudden fracture of the concrete slab,which makes the damage of the structure have obvious buffer time and improve the safety property of the structure.(2)Mesh size of textile is an important factor affecting the flexural behavior of TRC slab.With the decrease of mesh size,the flexural behavior of reinforced concrete slab can be effectively improved.When the mesh size is 80 mm × 80 mm,the reinforcement effect is the best.(3)The comprehensive analysis shows that the woven net formed by wire and carbon fiber has better reinforcement effect on the concrete slab,effectively restrain the development of cracks in the structure,and improve the flexural behavior.(4)With the improvement of the strength of the concrete slab,the cracking load of the concrete slab increases,which can improve the flexural behavior of the TRC slab in a small range,but the strengthening effect is not obvious.2.The interface property between concrete and textile in TRC slab is simulated as follows:(1)Based on the experimental study of TRC interface performance,the cohesive element in ABAQUS is implanted into the interface between the textile and concrete.Establish an effective model,and calculate the corresponding parameters by theoretical formula.The large damage and peeling effect of the interface layer in the TRC slab are simulated,and the evolution process of the interface damage between textile and concrete is analyzed from the load slip relationship curve.(2)The failure location and scope of the fiber reinforced net are analyzed,at the same time,it is found that the flexural capacity of the whole specimen is lower than that of the model without interface,and the cracking of concrete and the sliding of woven net are improved accordingly.3.The simulation results of the impact behavior of the textile reinforced concrete slab are as follows:(1)The larger the slenderness ratio of TRC slab is,the smaller the damage of concrete slab is,and it has better impact behavior and can maintain the structure property better under the impact load.(2)The drop height of hammer is an important factor in the study of impact behavior.With the rise of drop height,the damage of concrete increases obviously,and the carbon textile reaches the stress limit and breaks,which directly affects the impact behavior of TRC slab.(3)Four layer textile reinforced concrete has less absorbed energy,the more rebound energy,has better resistance to the impact energy of the hammer,and has better impact behavior. |
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