FINITE ELEMENT ANALISYS OF INFLUENCE FACTORS ON IMPACT RESISTANCE OF UHPC BEAM
In order to study the influence of stirrup ratio longitudinal reinforcement ratio UHPC strength on the im-pact resistance of UHPC beam,LS-DYNA software is used to establish the finite element model of UHPC beam un-der the impact of drop hammer.The results show that the steel fiber in UHPC improves the shear resistance of the beam,and the stirrup ratio has little effect on the impact response of the UHPC beam.When the longitudinal rein-forcement ratio is less than 1.0%,the failure mode is less reinforcement failure.With the increase of the longitudinal reinforcement ratio,the impact resistance of the beam increases,the failure mode changes to suitable reinforcement failure,and the maximum displacement in the span decreases,but the influence degree decreases gradually with the increase of the longitudinal reinforcement ratio.When the strength of UHPC increases from 100MPa to 140MPa,the damage mode of the beam body changes from oblique damage on both sides of the drop hammer to mid-span tensile damage.The impact resistance design of UHPC beam can reduce the configuration of the hooper and improve the ra-tio of longitudinal reinforcement or UHPC strength.
UHPC beamimpact resistanceinfluence factorfinite element analysis
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