CAJ | 학술논문

基于混凝土的塑性损伤模型及钢材的塑性流动模型,建立了双钢管混凝土轴压柱有限元模型.在此基础上,对双钢管混凝土轴压短柱的载荷-位移曲线进行了研究,重点分析了内外钢管之间的相互作用机理,影响该组合柱力学性能的主要因素.结果表明,内径大小及厚度的变化,对外径的约束力有明显的影响;同时,外径尺寸的变化对内径的约束力也有影响;试件的承载力随着核心混凝土强度、内外钢管的直径及壁厚的增大而增加.计算结果和试验结果总体上吻合良好.
기우혼응토적소성손상모형급강재적소성류동모형,건립료쌍강관혼응토축압주유한원모형.재차기출상,대쌍강관혼응토축압단주적재하-위이곡선진행료연구,중점분석료내외강관지간적상호작용궤리,영향해조합주역학성능적주요인소.결과표명,내경대소급후도적변화,대외경적약속력유명현적영향;동시,외경척촌적변화대내경적약속력야유영향;시건적승재력수착핵심혼응토강도、내외강관적직경급벽후적증대이증가.계산결과화시험결과총체상문합량호.
A nonlinear finite element model was developed to simulate double steel tubular concrete columns under axial compression based on a plastic damaged model of concrete and elastic-plastic constitutive relationship of steel.The load-displacement curves are simulated and more attentions are plied on the interaction mechanism of the outside and inside steel tube.A parametric study is also carried out.The numerical results indicate inside tube radius,tube thickness and concrete core strength correlate with the increase of the ultimate strength of the composite column.The numerical results have a close agreement with the tests.