CAJ | 학술논문

为了揭示方钢管再生混凝土中长柱在轴心荷载作用下的性能退化规律，以再生粗骨料取代率和长细比为变化参数，完成了5个试件的轴心受压试验。在此基础上，分析了其延性指标、能量耗散、刚度退化的演化过程。研究结果表明：方钢管混凝土试件的峰值荷载比方钢管再生混凝土试件的大；随着再生粗骨料取代率的增加，方钢管再生混凝土轴压中长柱的耗能能力具有先降后升的趋势；方钢管混凝土试件的延性系数均比其再生混凝土试件的大；试件的弹性轴压刚度随取代率的增加表现为先增后减；随着长细比的增加，钢管再生混凝土中长柱的轴压耗能和弹性轴压刚度具有稳步减小的趋势，延性系数则呈现为先降低后增长之势。所得刚度退化的简化计算模型可为工程设计提供参考。
위료게시방강관재생혼응토중장주재축심하재작용하적성능퇴화규률，이재생조골료취대솔화장세비위변화삼수，완성료5개시건적축심수압시험。재차기출상，분석료기연성지표、능량모산、강도퇴화적연화과정。연구결과표명：방강관혼응토시건적봉치하재비방강관재생혼응토시건적대；수착재생조골료취대솔적증가，방강관재생혼응토축압중장주적모능능력구유선강후승적추세；방강관혼응토시건적연성계수균비기재생혼응토시건적대；시건적탄성축압강도수취대솔적증가표현위선증후감；수착장세비적증가，강관재생혼응토중장주적축압모능화탄성축압강도구유은보감소적추세，연성계수칙정현위선강저후증장지세。소득강도퇴화적간화계산모형가위공정설계제공삼고。
In order to reveal the degenerate rule of the mechanical behavior under the axial pressure of square steel tube reinforced recy-cled concrete intermediate length columns,5 specimens were axial-compression tested with the varied parameters of recycled coarse aggre-gate replacement ratio and slenderness ratio.On this basis,the evolutionary process of ductility index,energy dissipation and rigidity degen-eration were conducted research.As conclusion,the peak loads of square steel tube concrete columns were heavier than the recycled con-crete ones.The energy dissipation of recycled concrete columns went up after dropping along with the increase of replacement ratio.The ductility indexes of concrete columns were larger than the recycled ones.Elastic shaft rigidity dropped after going up along with the in-crease of replacement ratio.Energy dissipation of axial compression and elastic shaft rigidity declined steadily along with the increase of re-placement ratio,while the ductility index went up after dropping.The conclusive simplified model of rigidity degeneration could be served as a conference in practical engineering.