CAJ | 학술논문

为揭示圆钢管再生混凝土柱的轴压性能，基于试验实测数据，采用ABAQUS有限元软件对试验试件的受力全过程进行了数值模拟，并证实了数值模拟方法的可行性，在此基础上，通过增设30个数值计算模型，全面考察了含钢率、长细比及截面积等变化参数对钢管再生混凝土轴压柱受力性能的影响。结果表明：长细比的增长将显著削弱其极限承载力，而含钢率的增长将显著提高其延性和耗能能力；增大截面积将有利于承载力的提高，但提高幅度不明显；依据现行规范公式计算所得的极限荷载值较试验值和模拟值的小，计算结果偏于保守。将再生粗骨料取代率引入规范公式予以修正，所得计算模型对钢管再生混凝土轴压构件的设计计算具有参考价值。
위게시원강관재생혼응토주적축압성능，기우시험실측수거，채용ABAQUS유한원연건대시험시건적수력전과정진행료수치모의，병증실료수치모의방법적가행성，재차기출상，통과증설30개수치계산모형，전면고찰료함강솔、장세비급절면적등변화삼수대강관재생혼응토축압주수력성능적영향。결과표명：장세비적증장장현저삭약기겁한승재력，이함강솔적증장장현저제고기연성화모능능력；증대절면적장유리우승재력적제고，단제고폭도불명현；의거현행규범공식계산소득적겁한하재치교시험치화모의치적소，계산결과편우보수。장재생조골료취대솔인입규범공식여이수정，소득계산모형대강관재생혼응토축압구건적설계계산구유삼고개치。
In order to reveal the axial compressive capacity of recycled aggregate concrete-filled cir-cular steel tube columns, numerical calculation using the ABAQUS software was conducted based on experimental results. The feasibility of the numerical simulation was proved by comparing the experi-mental and numerical results for the mechanical behavior of 22 specimens. On this basis, 30 extend-ed numerical models were built to conduct systematic analysis to reveal the calculation method of re-cycled aggregate concrete-filled steel tube columns. The variable factors included the aggregate re-placement ratio, steel ratio, and slenderness ratio and section area. The conclusion shows that, the numerical simulation results agree well with the test ones. Slenderness ratio and steel ratio both have obvious influence on the bearing capacity. In particular, the increase of slenderness ratio can weak-en the bearing capacity, while the increase of steel ratio can improve ductility and energy dissipation capacity. The bearing capacity will also be strengthened with the enlargement of section area, whereas the amplitude is not sharp. The calculation results based on current steel-concrete design code is likely to be conservative and slightly lower than the experimental and numerical results. Con-sidering the influence of aggregate replacement ratio, the axial compression calculation formulas of concrete-filled steel tube columns based on the code is amended and can be adopted in structure de-sign and practical engineering.