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The purpose of this paper was to evaluate the bolt slippage in column-tree steel moment connection. Column-tree connections are composed of a shop-welded and field-bolted steel structure. However, it is known for that the bolt slippage was occurred in columntree connection system. Therefore, the bolt slippage in column-tree connection was examined the effects on seismic performance. So, there are fabricated with that 600, 500, 400 mm depth of beam were attached to same column size, respectively. As a result, the maximum load obtained from column face was increasingly decreased when the depth of beam was smaller. Also, if it is possible to control the L/d, it would be determined the section and amount of bolt slippage.

Bolt Slippage Evaluation in Column-tree Steel Moment Connection on L/d