CCFT

The use of circular concrete-filled tube ( CCFT) coloumns composite structures become wide because it is of superior seismic performance, which requires us to create seismic performance assessment criteria.

钢管混凝土组合结构因为其优异的抗震性能，使用越来越广泛。这也要求我们建立相关的抗震性能评估准则。

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This paper presents an innovative concrete filled steel tubular ( CFT) column system, named as confined CFT or CCFT, for improved seismic design of steel and concrete composite structures.

提出一种适用于抗震设计的新型钢管混凝土体系：约束钢管混凝土柱体系。

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The study concluded that the capacity of CCFT decreased sharply with the increase of fire time and the capacity was almost directly proportional to the temperature distribution.

研究表明，短柱在火灾下与火灾后的极限承载力随升温时间的增加而剧减，承载力与温度场的分布基本上成线性关系。

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In order to further apply centrifuge concrete-filled steel tube structure to other engineering fields, the development of fundamental study on design theory for CCFT structure will have significant effects on the new subject.

为了将离心钢管混凝土结构进一步应用于其它基本建筑领域，并使其成为一个完整的结构体系，开展离心钢管混凝土结构的设计理论基础性研究，具有重要的理论和实际意义。

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Test results show that: because of the local confinement, CCFT columns demonstrated significant ductility and energy-dissipation capability;

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；

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This paper presents a new type of CFT column named CCFT column ( confined concrete filled tubes).

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。

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By using local confinement in the plastic hinge region, A CCFT column can acquire improved ductility compared with a CFT column under cyclic loading.

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。

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