Finite Element Analysis On The Anti-seismic Property Of Hybrid Fiber Reinforced Concrete Columns Under Low Cyclic Reversed Loading

Hybrid fiber reinforced concrete in this text is a kind of heterogeneous composite material which is concrete reinforced by steel fiber and polypropylene fiber. Hybrid fiber reinforced concrete is superior to single composite material on many performances. China is a country which is earthquake happened frequently. A few times great earthquakes caused tremendous damage to us. It is necessary to study anti-seismic property of hybrid fiber reinforced concrete and use it in building structure in future. Finite element analysis is convenience, quick, cost saving. So this text studying the anti-seismic property of hybrid fiber reinforced concrete column by ANSYS.Finite element model in this text is build up by reasonably select element type, constitutive relation and failure criterion. Hysteresis curve and skeleton curve which are obtained by this model well matched with the experiment. Study carrying capacity, ductility, energy-dissipating capacity and rigidity degeneration of the hybrid fiber reinforced concrete column under low cyclic reversed loading. Results indicate that fiber can improve carrying capacity, ductility, energy-dissipating capacity and rigidity degeneration of concrete. The ductility of hybrid fiber reinforced concrete is better than steel fiber reinforced concrete, but advantages on carrying capacity, energy-dissipating capacity and rigidity degeneration is not notable. In addition, this text analyze the effect of anti-cracking of fiber in the hybrid fiber reinforced concrete column under low cyclic reversed loading through load-strain curve of rebar and concrete strain cloud picture. Verify plane cross-section assumption. Intuitively show the function of restraint of fiber in crack developing process by crack developing map.At last, this text build up shear capacity calculate formula which is base on "truss+arch" model. Shear capacity which is determined by this formula is different from finite element analysis result. After anatomize, I find that the difference is reasonable, not influence its use value.