Abstract
In the case of the embedded type colunm-to-footing connections of large-scale steel structures such as thermal power plants and steel manufacture plants, the embedded depth of column is usually less than the depth of column section ; and the base plate is connected rigidly with reinforced concrete footing by anchor bolts. The results of tests and analysis on the fracture mode and the-ultimate strength of this type connections are as follows, i) The footing concrete of the connections has been fractured by punching shear. The fracture modes can be classified into two types, i.e., one is the punching shear fracture of the upper concrete due to the bearing stress between the footing concrete and the upper face of base plate, and, the other is that of the front concrete due to the bearing stress between the stub concrete and the side of the embedded colunm. ii) Based on the mechanism of stress transfer of the connections obtained from above test results, the analytical method of predicting the ultimate strength of the connections has been proposed for each fracture mode of the connections. iii) The proposed analytical method accounts for the effects-of the experimental variables on the ultimate strength and the fracture modes of the connections.
