CAJ | 학술논문

以内时理论和损伤理论为框架，分析了骨料粒径和应变率效应对混凝土损伤的影响。建立了大骨料混凝土的率型内时损伤本构模型，并采用该模型进行多轴动态应力-应变曲线分析。与大骨料混凝土多轴动态试验数据对比结果显示数值与试验结果符合较好，说明该模型可作为大骨料混凝土动态性能研究的依据。最后，应用所提出的本构模型和未考虑大骨料因素的内时损伤本构模型对某混凝土拱坝进行非线性地震反应分析，结果表明，应变率和骨料粒径对于结构的强度和刚度影响较大，在分析中应得到重视。
이내시이론화손상이론위광가，분석료골료립경화응변솔효응대혼응토손상적영향。건립료대골료혼응토적솔형내시손상본구모형，병채용해모형진행다축동태응력-응변곡선분석。여대골료혼응토다축동태시험수거대비결과현시수치여시험결과부합교호，설명해모형가작위대골료혼응토동태성능연구적의거。최후，응용소제출적본구모형화미고필대골료인소적내시손상본구모형대모혼응토공패진행비선성지진반응분석，결과표명，응변솔화골료립경대우결구적강도화강도영향교대，재분석중응득도중시。
Based on the theory of endochronic and damage mechanics,the effect of aggregate size and strain rate on the damage variables of concrete is analyzed.A rate-dependent endochronic damage constitutive model of large aggregate concrete is proposed.The proposed model is used to analyze the multiple axis dynamic stress-strain curves.Compared with experimental data it is shown that the analytical result is in good agreement with the experimental data,and it can be used as the basis for dynamic properties research of large aggregate concrete.Finally,nonlinear seismic responses of a concrete arch dam are analyzed with this model and the model of endochronic and damage mechanics with normal concrete.The experimental results show that the effect of strain rate and aggregate size on the strength and stiffness of concrete structures is remarkable and should be paid attention to in analysis.