Effect Of Elastic Columns On The Mechanism Of
Damage Control For Steel Structures In
Japan And The USA
Author(s)
Y. Kimura & S. Hamazaki
Abstract
There are some differences in steel structures from the point of view of seismic
designs between the USA and Japan. Japanese typical frames are spatial moment
resisting frames. USA frames are the perimeter frames, and the columns inside
the frames are designed as gravity columns, which support only the weight of the
buildings. Such columns may divide the shear force over the height of the frame
and work as damage control systems. This study clarifies the drift deformation
concentration for the standard steel moment resistant frames in the USA and
Japan. The equations for the drift concentration are developed under the
equilibrium conditions, and compared with the push over analyses results.
Keywords: USA and Japanese moment resisting frame, gravity column, drift
concentration factor, ratio of column flexural stiffness.
1 Introduction
The typical structural system of steel buildings in the USA is perimeter frame,
while the Japanese typical steel system is a spatial moment resisting frame. USA
frames consist of seismic columns and gravity columns. While the gravity
columns are designed not to carry the seismic forces and the role of the gravity
columns is to support the weight of the building, they have some flexural
stiffness. Such column flexural stiffness and strength are regarded as the
redundancy of structures, and the effect of column properties on the soft story
mechanism is supposed to be performed during an earthquake. While researches
have been concerned about the possibility of drift concentration in frames (e.g.
Keywords
USA and Japanese moment resisting frame, gravity column, drift
concentration factor, ratio of column flexural stiffness.
Related Book
Other papers in this volume
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