Seismic Response Analyses Of Rocking
Structural Systems With Yielding Base Plates By The Finite Element Method
Author(s)
M. Midorikawa, T. Azuhata, T. Ishihara & A. Wada
Abstract
It is pointed out that the effects of rocking vibration accompanied with up-lift
motion may reduce the seismic damage of buildings subjected to severe
earthquake motions. Based on these findings, we have been developing the
rocking structural systems that cause the rocking vibration under appropriate
control during a major earthquake motion. One of these systems has weak base
plates at the bottom of each column at the first story of steel frames. When the
weak base plates yield during a major earthquake motion, the frames cause the
rocking vibration. In this paper, the seismic responses of the base-plate-yielding
rocking systems are examined by finite element analysis. A three-story, one-by-two
bay braced steel frame of a half scale is analyzed, that was previously tested
by a shaking table. According to the results of the previous tests, the base plate
yielding systems reduced effectively the seismic responses of steel frames. The
total height of the test frame is 5.3 meters, each floor height is 1.7 to 1.8 meters,
each floor plan is 3 by 4 meters, and the total weight is 15.0 tons. The yielding
base plates are installed at the bottom of each column at the first story. One of
the three frames in the test direction is modelled in the analysis. The base plates
and the columns of the first story are modelled as shell elements. The columns
and girders at the second and third stories are modelled as beam elements, and
the bracing members as truss elements. The earthquake ground motion is the
record of the 1940 El Centro NS component whose time scale is shortened to
1/√2. From the analytical results, it is concluded that the seismic responses of the
base-plate-yielding rocking systems are appropriately simulated comparing with
the experimental results obtained from the previous shaking table tests.
Keywords: seismic response, dynamic analysis, finite element method, seismic
response reduction, rocking vibration, up-lift, steel frame, base plate, yielding.
Keywords
seismic response, dynamic analysis, finite element method, seismic
response reduction, rocking vibration, up-lift, steel frame, base plate, yielding.
Related Book
Other papers in this volume
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