局部约束方钢管混凝土柱约束件设计方法

提出了一种新型方钢管混凝土柱结构形式 :局部约束方钢管混凝土柱。它通过在方钢管混凝土柱的塑性铰区域设置局部约束以有效提高柱在往复荷载作用下的延性 ,克服传统方钢管混凝土柱由于局部屈曲而导致的延性不足的抗震缺陷。建立了约束件设计的塑性铰模型 ,应用该模型设计了 4个分别采用钢板、钢带和角钢约束件的约束钢管混凝土试件 ,并进行了往复荷载试验。试验结果表明 :局部约束可有效提高柱的延性 ,增加柱的耗能能力 ;同时说明了该设计方法的有效性。

EXPERIMENTAL STUDIES ON HYSTERIC BEHAVIOR OF SQUARE CCFT COLUMN

This paper presents a new type of CFT column named CCFT column(confined concrete filled tubes).By using local confinement in the plastic hinge region,A CCFT column can acquire improved ductility compared with a CFT column under cyclic loading.Design method of confine element was set up based on plastic hinge theory.Four square CCFT columns were tested which was confined by steel plat or steel stripes or angles.The columns loaded with constant axial load and cyclic lateral force until damage.Test results show that:because of the local confinement,CCFT columns demonstrated significant ductility and energy-dissipation capability;Design method for the confinement is effective.