Seismic
Behavior of Steel Buildings with Combined Rigid and
Semi-Rigid Frames
Summary:
The 1994 Northridge Earthquake (USA) has shown the
vulnerability of welded moment connections in steel moment
resisting frames (MRFs) subject to severe earthquake ground
motions (EQGMs). Since then, as an alternative connection
type, bolted connections, often called semi-rigid connections,
are considered for the
retro t and new design of steel MRFs in high seismicity
regions. This paper investigates the seismic design and
performance of a hybrid system, consisting of welded moment
frames and bolted semi-rigid frames. For this purpose,
an analytical study is carried out on two steel buildings
with interior semi-rigid steel frames having beam-to-column
connections with di erent strength and sti ness ratios.
The two buildings, of 5 and 10 stories, are designed in
compliance with the current seismic design codes for two
di erent cases. In the rst case (Case 1), the interior
frames are assumed to be simply connected. In the second
case (Case 2), the interior frames are assumed to be semi-rigidly
connected. The buildings are subjected to three representative
earthquakes. The evaluation of the results indicates that
making the interior frames semi-rigid can lead to less
story shear and lower column and connection moments and
will increase the lateral load capacity of the building.
Format:
Pages : 12
Size: 184 kb
Author : B¨ulent AKBAS, Jay SHEN
Download:Seismic Behavior of Steel Buildings with Combined Rigid and Semi-Rigid Frames
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