【摘要】 对18根不同长细比和含钢率的钢管轻集料混凝土长柱进行轴压试验,研究了钢管轻集料混凝土长柱在轴心压力下的受力性能,并与钢管普通混凝土进行了对比.结果表明:钢管轻集料混凝土长柱破坏属于整体失稳破坏,长细比越大,其承载力和稳定系数越低,加载过程中由全截面受压转为一侧受拉一侧受压,最终因为挠度过大而破坏;相同长细比情况下,钢管轻集料混凝土构件的承载力随含钢率增大而增大;核心混凝土性能对钢管混凝土的界限长细比有一定影响,钢管轻集料混凝土的界限长细比低于钢管普通混凝土;钢管轻集料混凝土的稳定系数要高于长细比相同的钢管普通混凝土.更多还原

【Abstract】 Based on axial compression tests of 18 lightweight aggregate concrete-filled steel tube(LACFST) long columns,the behavior of LACFST long columns was studied and compared with that of normal CFST.The results demonstrate that the failure of LACFST long columns belong to general instability failure. The larger the slenderness ratio,the lower the bearing capacity and stability factor.In the loading process,the stress distribution changes from compression on the whole section to compression on one side and tension on the other side.With the same slenderness ratio,the bearing capacity of the specimen increases with the steel ratio.The core concrete performance influences the boundary slenderness ratio and stability factor of LACFST.It is proved that the boundary slenderness ratio of LACFST is lower than that of normal CFST,and the stability factor of LACFST is larger than that of normal CFST.更多还原