An Experimental Study on Steel Sguare Pipe Column Bases Solidified with Encasement

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A new structutal method of steel column bases, which solidified with RC stub covered with steel tubing. was proposed. This methos has good construction workability. In order to clayfy the mechanical characteristics of the prooised column bases, 13 specimens were tested under alternating horizontal load. The main parameters involved in the tests were hight and covering depth of RC stub, comressive strenght of concret and arrangement of reinforcing main bar. Some observations from the test results are as follors. 1. The column bases with high strength concret were good mechanical characteristics in spite of small RC stub. 2. The yielding strength of many specimens were decided by yielding of reinforcing bar. But some specimens, which solidified with low stub consist of low strength conoret, were decided by failer of anchorage of reinforcing bar. 3. The steel tubing contributes to stress transfer from steel column to RC stub.