The Researches Of Nonlinear Finite Element And Experiment On PE-ECC Component

Engineered cementitious composite(ECC)is a fiber reinforced cement based composite material systematically designed on the basis of micromechanics and fracture mechanics by Victor C.Li, the professor of University of Michigan.PE-ECC is a project of fiber reinforced cement based composite materials, which has high cracking capacity, high strength, high toughness characteristics and exhibit pseudstrain-hardening behavior and multiple cracking under tension?On the basis of the researches of others, PE-ECC material is applied to the short beam and the shear wall in this dissertation.This dissertation uses the method of experimental study and finite element simulation Combined, the short beam with PE-ECC and the shear wall with PE-ECC material in plastic hinge zone were tested and analysised, the main research contents are as follows:(1)Based on the finite element software ABAQUS and the softened strut-and-tie model, the shear resistance of the short beams were calculated. It turned out that, calculation results are consistent with the test results; the PE-ECC short beams show higher value of ultimate load compared with the high strength concrete short beam and the ultimate shear-resistant capacity drops quickly with shear-span ratio increasing;With the increase of stirrup ratio,the ultimate shear-resistant capacity increase more when the shear-span ratio is small than the shear-span ratio is big.(2)The experimental study on the seismic performance the part of the high damping PE-ECC shear wall with concealed bracings under cyclic loading was carried out. Test and analysis results indicate that, the part of the high damping PE-ECC shear wall with concealed bracings have the higher cracking load, yielding load, ultimate bearing capacity, late stiffness and performs well in ductility and energy dissipation.(3)Based on MSC. MARC program of multi-layer shell element, simulation analysis was carried out on the shear wall. Analysis showed that, the numerical simulation values are consistent with the experimental research; the bearing capacity of shear wall components increases significantly, but the ductility decreases rapidly with an increase of axial compression ratio; With longitudinal reinforcement ratio of concealed column increases, bearing capacity of shear wall components increases significantly, pinching effect of hysteretic curve was improved,but the ductility decreases; With longitudinal reinforcement ratio of concealed bracings increases, bearing capacity of shear wall components increases slowly, but the ductility increases quickly.