Basic Investigation for shearing failure of concrete filled steel tubular column

《钢管混凝土（CFT）结构设计和施工建议》于1997年在日本出版，并于2008年修订。钢管混凝土柱的轴心承载力和抗弯承载力的计算方法是在400多个试件试验结果的基础上建立起来的，而《建议》中对受剪破坏的钢管混凝土柱的试验结果仅涉及12个试件。有必要积累钢管混凝土柱的抗剪承载力和抗剪性能的试验数据。对16根剪跨比分别为0.5和0.75的钢管混凝土柱进行了试验研究。钢管的直径与厚度之比约为30。它们在恒定轴向力下受到循环侧向力。14个试样在弯曲屈服前发生剪切破坏。采用日本CFT推荐的抗剪承载力计算方法，计算结果偏低30%左右。

“Recommendations for Design and Construction of Concrete Filled Steel Tubular (CFT) Structures” was published in 1997 and revised in 2008 in Japan. The calculating methods for axial strength and flexural strength of CFT columns were established on the bases of the experimental results of total of more than 400 specimens, however the test results of the columns which fail in shear were referred to only twelve specimens in the Recommendations. It is necessary to accumulate the experimental data of shearing strength and behavior of CFT columns. Tests were carried out on sixteenspecimens of the circular CFT columns with shear span ratio of 0.5 and 0.75. The diameter to thickness ratio of the steel tube was around 30. They were subjected to cyclic lateral force under constant axial force. Fourteen specimens failed in shear before flexural yielding. The shearing capacities were underestimated around 30% by the calculating method of the CFT Recommendations in Japan.