拉压循环荷载下基于能量的混凝土损伤本构模型

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中图分类号：TU528.01 文献标志码：A

Energy-based Concrete Damage Constitutive Model Under Tensile-Compressive Cyclic Loadings

WU Xiaoxin 1 ， WANG Yin 1，2 ， JIANG Yating 1 ， XIE Qun 1 ， YANG Taochun 1 ZONG Xianghua' ， SUN Liuyang 3

（1.School of Civil Engineering and Architecture，University of Jinan，Jinan 25o022，Shandong，China; 2.StateKeyLaboratoryofDisasterPreventionandMitigationof ExplosionandImpact，ArmyEnginering Universityof PLA， Nanjing 210007，Jiangsu，China；3. Tong Yuan Design Group Co.，Ltd.，Jinan ，Shandong，China）

Abstract：To solvethe problem that theoriginal Kong-Fang concrete damage constitutive model could not describe strain hardening phenomenon ofconcrete duringcompresionandmodulus damage ofconcrete subjectedto tensile-compressive cyclicloadings，the yield strength surface was introduced todescribethestrainhardening phenomenonofconcrete.Scalars of tensile and shear damage derived onthebasis of energy method were multipliedbytensileand shearstresses respectively to describe the modulus damage problem of concrete.In summary，an energy-based concrete damage constitutive model undertensile-compressivecyclic loadings was establishedand implanted intoLS-DYNA software.Stress-straincurves were predicted under uniaxial compresioncyclicloading，uniaxial tensioncyclic loading，anduniaxial tension-compressive cyclic loading of aconcrete single element model.The results showthatstress-strain curves obtained by numericalycalculating thesingleelement modelusingtheestablishedmodel includeelastic segment，strain hardening segment，and strain softeningsegment.The established model can notonly efectively verifythe strain hardening phenomenon inascending section and strainsoftening phenomenon in descending section of the concrete stress-straincurves，but also perfectly predict the concrete stress-strain curves under uniaxial compressivecyclic loading，uniaxial tensile cyclic loading，and uniaxial tensile-compressive cyclic loading.

Keywords： engineering mechanics；cyclic loading；energy method； modulus damage； constitutive model

既有混凝土建筑在遭受地震、风振、冻融等循环荷载时，混凝土处于拉伸-压缩的循环应力状态。（剩余8743字）