拉壓循環(huán)荷載下基于能量的混凝土損傷本構(gòu)模型

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中圖分類號：TU528.01 文獻標志碼：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、風振、凍融等循環(huán)荷載時，混凝土處于拉伸-壓縮的循環(huán)應(yīng)力狀態(tài)。（剩余8743字）