CAJ | 학술논문

为了研究低屈服点钢材LYP225的循环本构关系，对18个试件进行单调加载和循环加载，研究其单调曲线、滞回特点、破坏形态等。基于Ramberg-Osgood模型拟合了对称逐级加载下的循环骨架曲线，通过试验滞回数据标定了基于Chaboche模型的等向强化和随动强化参数，并将其输入到Abaqus软件的混合强化模型中，对强化参数的准确性进行验证。结果表明：LYP225钢材的应力应变关系与加载历史相关；在不同加载制度下LYP225钢材均表现出良好的延性特征；采用Ramberg-Osgood模型能较好地模拟LYP225钢材在循环对称逐级加载下的骨架曲线；将标定的混合强化参数输入到Abaqus软件中，所得结果能准确模拟LYP225钢材的滞回曲线。因此， LYP225钢材在循环荷载下的性能不同于单调荷载，通过试验数据拟合的强化参数可用于整体结构中的地震反应分析。
위료연구저굴복점강재LYP225적순배본구관계，대18개시건진행단조가재화순배가재，연구기단조곡선、체회특점、파배형태등。기우Ramberg-Osgood모형의합료대칭축급가재하적순배골가곡선，통과시험체회수거표정료기우Chaboche모형적등향강화화수동강화삼수，병장기수입도Abaqus연건적혼합강화모형중，대강화삼수적준학성진행험증。결과표명：LYP225강재적응력응변관계여가재역사상관；재불동가재제도하LYP225강재균표현출량호적연성특정；채용Ramberg-Osgood모형능교호지모의LYP225강재재순배대칭축급가재하적골가곡선；장표정적혼합강화삼수수입도Abaqus연건중，소득결과능준학모의LYP225강재적체회곡선。인차， LYP225강재재순배하재하적성능불동우단조하재，통과시험수거의합적강화삼수가용우정체결구중적지진반응분석。
In order to study the cyclic constitutive relationship of low-yield-point steel LYP225 ,1 8 specimens were tested under monotonic loading and cyclic loading.The monotonic curves,hysteretic performance and failure modes were discussed.The skeleton curves were fitted under cyclic loading with the increase of the strain step by step based on the Ramberg-Osgood model.The isotropic hard-ening and kinematic hardening parameters were calibrated according to the test data based on the Chaboche model and input into the combined hardening model in Abaqus to verify the accuracy of the calibration.The results show that the stress-strain relationship of LYP225 is related to the loading history.LYP225 shows excellent ductility under different loading systems.The Ramberg-Osgood model can simulate the cyclic skeleton curves with the increase of the strain step by step.The finite element results can simulate the hysteretic curves of LYP225 accurately with the calibrated hardening parameters input into Abaqus.Therefore,the performance of LYP225 under cyclic loading is differ-ent from that under monotonic loading.The calibrated hardening parameters according to the test da-ta can be used in earthquake response analysis of the overall steel structure.