Bonding Mechanismand Analysis On Micromechanics FEM Of SFRC Interface

Steel fiber reinforced concrete (SFRC) is an outstanding performance composite material.There are a lot of influencing factors on SFRC's mechanical properties because of its compositeproperties.The interface bonding characteristics and interface effect are the key fators to displaythe ability of fiber's enhancement,toughening and crack resistancing to concrete. This paperhavesimulatedtheprocess ofthesteel fiberpulloutedfrom the concrete onthebasis ofprevioustest data by micro-mechanics Finite Element Method(FEM) and have analysed the interfacebond mechaninism and reinforcement effect about the smooth and straight steel fiber and thedeformed.Andtheworkdoneisasfollows:1.Establish the pullout micro-mechanics Finite Element model of SFRC to analysis thepullout process and at the same time put forward a bond-slip constitutive model for finiteelement calculation of pullout problems of SFRC. The numberiacl results have been in goodagreementwithexperimentresults.2.Useplanestressmethodtosimulatetheprocessofthesmoothandstraightfiberpulloutedfrom the concrete for the first time , compare the results with the axisymmetric method's andfound a simulation method for fiber been pullouted from all angels. Discover a numberial modelmethodforsteelfibers'pulloutedproblemswithhook-end.3.Analysethebondmechanismonthebasisofnumberiaclresultsandtestresults,comparethe changes of the bond strength of fiber pullouted from differet angels and analyse the energydissipationandsubsequenttoughnessoffiber'sobliquepullouted.4.Studyfibers'reinforcedmechanismfrommechanicsofcompositeandfracture,foundoutthe difference of the reinforcedment between the straight steel fiber and the deformed.At thesametimeobaintherelevantconclusion.