An Experimental Study on Mechanical Behaviors of Non Base-plate Column Bases of Square CFTs with Built-in Reinforcements

In this study, the authors propose a new exposed-type column base which is a non base-plate square CFT column base with built-in high strength reinforcements (square CFTR column base). The base plate and anchor bolts are omitted in this CFTR column base, but the high strength reinforcements are inserted from the CFT column to the RC foundation. A total of three specimens was fabricated. The parameter for the study is the axial force ratio (0, 0.25, 0.50). The specimens were tested under the horizontal cyclic lateral load while subjected to a constant axial load. The mechanical behaviors of the column bases are investigated. The test results indicate that the non base-plate CFTR column bases have excellent seismic performances and are applicable in the practical structural design