文档介绍：下的力学性质就能得到钢管再生混凝土和钢管普通混凝土在一定的受火时间后
的轴压承载力。
(4)进行空心钢管再生混凝土长柱的轴压承载力试验,试验表明,空心钢管再生长柱的轴压承载力是要低于空心钢管普通混凝土的轴压承载力。首次进行了钢管再生混凝土柱的抗火试验,试验表明,钢管普通混凝土的耐火性能相比于钢管再生混凝土的耐火性能要差一些。有限元模拟的抗火时间与试验得到的抗火时间基本接近。这些试验弥补了相关实验研究的不足,并能从试验角度进一步验证本文提出的理论公式的正确性和适用性。
(5)进行了实心和空心钢管海砂混凝土的耐久性试验,测试了它们的腐蚀电流密度。空心钢管海砂混凝土的腐蚀电流密度要远高于实心钢管海砂混凝土的腐蚀电流密度。建议在空心钢管混凝土中不采用海砂与钢管内壁直接接触。对于实心钢管海砂混凝土测得的腐蚀电流密度比较小,在实际工程中海砂可以直接与钢管内壁接触。
(6)提出了钢管海砂混凝土柱的腐蚀电流密度预测公式。同时对钢管双层混凝土耐久性能进行了研究,得到了钢管双层混凝土中氯离子在扩散之后分布的解析解,通过对解析解观察和构造得到钢管双层混凝土中氯离子随时间和空间分布的计算公式,并通过回归确定了该计算公式中待定系数的值,理论计算公式计算结果与有限元模拟得到的结果接近。
关键词:钢管特种混凝土;损伤;高温;承载力;腐蚀电流密度
Abstract
The property of Special Concrete Filled Steel Tubular (SCFST) column has been studied in the paper. The Special Concrete Filled Steel Tubular (SCFST) column is a kind of special Concrete Filled Steel Tubular (CFST) column, which is different from Ordinary Concrete Filled Steel Tubular (OCFST) columns. The SCFST column include Recycled Concrete Filled Steel Tubular (RCFST) column and Sea Sand Concrete Filled steel tubular (SSCFST) column. The property of Recycled Concrete (RC) and Sea Sand Concrete (SSC) are different with that of Ordinary Concrete (OC). Hence, after the Recycled Concrete (RC) and Sea Sand Concrete (SSC) are poured into the steel tube, the property of RCFST columns and SSCFST columns will be different from that of OCFST columns. The paper will study the characteristics of RCFST columns and SSCFST columns. The following contents are included:
One new damaged model has been given for studying RCFST columns and RC in the paper. paring the experimental value with the analytical value, the damaged model can be used for revealing the difference between RCFST and OCFST. According to plasticity damage mechanics, the dilation angle of RC is close to that of OC.
Based on the triaxial constitutive relation, the formulae pressive strength of OCFST columns under axial pressure are applicable to RCFST columns. The damage has been used for the stability coefficient of RCFST columns, and the