Improved Configuration of I-Beam to Box Column Connections in Seismic Steel Moment Frames

Abstract eng:
In countries like Japan and China, a number of steel moment frame buildings are built with box columns and I-beams. The I-beam to box column (IBBC) connection is not straight-forward. Seismic design of moment frames expects these IBBC connections to accommodate 4-6% drift levels that the building sustains during strong earthquake shaking. The studies reported in literature on seismic behaviour of IBBC connections do not clarify whether the current IBBC connections can accommodate these drifts. The configurations of IBBC connections currently in use have major deficiencies, like discontinuity in flow path of forces between beam and column. This paper presents an improved IBBC connection configuration, which overcomes many deficiencies present in current IBBC connections. Displacement-based inelastic finite element analyses are performed to estimate the drift capacities of current and proposed IBBC connections; the proposed connection is seen to perform much better.

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