Seismic Performance of Steel Special Moment Resisting Frame Using Reduced Beam Section

Ginsar, Ima Muljati and Lumantarna, Benjamin (2011) Seismic Performance of Steel Special Moment Resisting Frame Using Reduced Beam Section. In: The 3rd International Conference of European Asian Civil Engineering Forum, 20-09-2011 - 22-09-2011, Yogyakarta - Indonesia.

Abstract

After the 1994-Northridge Earthquake several steel buildings failed to maintain beam-column joint stronger than the member. As the result, structures do not meet the safe failure mechanism as determined in strong column weak beam concept. To encounter the problem, a new design philosophy has been developed to force the inelastic deformation of the frame, away from column connection to assure column interface is still in elastic condition. Reduced Beam Section (RBS) Moment Connection has been developed according to the philosophy. The method reduces beam flange area in order to reduce the beam moment capacity at the interface of the column. The purpose of this research is to evaluate the performance of steel special moment resisting frame with RBS designed according to SNI 03-1729-2002 and AISC 358-05. The considered buildings are 4-, 8- and 12- stories structures subjected to seismic loading in x-direction. Static nonlinear pushover and dynamic nonlinear time history analysis have been used to observe the performance of the structures. Results show that RBS Moment Connection is able to guarantee the strong column weak beam mechanism. All structure meets the damage index requirement, but have excessive drift ratio. The used column section becomes more efficient than the regular steel special moment frame.

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