基于位移的方钢管混凝土柱抗震设计方法研究

Displacement-based seismic design method for square CFT columns

对基于位移的方钢管混凝土柱抗震设计方法进行了研究:介绍了基于位移抗震设计方法的概念、原理和设计的一般过程;探讨了方钢管混凝土柱的等效刚度、等效阻尼等设计中的关键问题,并确定了参数的具体取值;最后对方钢管混凝土柱进行了具体的基于位移的抗震设计,并研究了主要参数的影响。结果表明:在通常范围内,第二阶段刚度系数对滞回阻尼比影响不大;随着轴压比的增加,钢管壁厚度增加,柱延性系数增加;随着截面尺寸增加,钢管壁厚度减小,屈服弯矩也减小。

Displacement-based seismic design method of concrete filled square tubular in this paper. The key problems such as equivalent stiffness and damping ratio, the d columns has been researched etail design procedure of CFT columns and the main factors related with CET columns are summarized. Results show that stiffness of the second stage has little effect to hysteretic damping ratio. The thickness of steel tube and the displacement ductility of the CFT columns are both increased as increasing axial loading ratio, the thickness of steel tube and yield moment are both decreased as increasing the section dimension of the CFT columns.