简介：Byusingthelogarithmicstrain,thefinitedeformationplastictheory,correspondingtotheinfinitesimalplastictheory,isestablishedsuccessively.Theplasticconsistentalgorithmwithfirstorderaccuracyforthefiniteelementmethod(FEM)isdeveloped.Numericalexamplesarepresentedtoillustratethevalidityofthetheoryandeffectivenessofthealgorithm.

简介：Anenergy-dissipationbasedviscoplasticconsistencymodelispresentedtodescribetheperformanceofconcreteunderdynamicloading.Thedevelopmentofplasticityisstartedwiththethermodynamichypothesesinorderthatthemodelmayhaveasoundtheoreticalbackground.Independenthardeningandsofteningandtheratedependenceofconcretearedescribedseparatelyfortensionandcompression.AmodifiedimplicitbackwardEulerintegrationschemeisadoptedforthenumericalcomputation.Staticanddynamicbehaviorofthematerialisillustratedwithcertainnumericalexamplesatmaterialpointlevelandstructurallevel,andcomparedwithexistingexperimentaldata.Resultsvalidatetheeffectivenessofthemodel.