Damage Mechanism For High Strength Steel Part
Frame Without Diaphragm
Author(s)
Y. Kimura & T. Ishihara
Abstract
Recently, the high tension steel with the yield stress of 800 kN/mm2 was
developed, and the loading test of the structural members with this steel has been
confirmed. It is shown that the ratio between ultimate strength and yield strength
is almost unity, so that the members with this steel have quite small ductility.
When rigid moment resisting frames with high tension steel are subjected to
seismic force, the fracture at the ends of beam may occur and it causes the
strength of frames to decrease. On the other hand, the semi-rigid moment
resisting frames without diaphragm with high tension steel can absorb the
seismic energy at the beam-to-column connections due to its plate bending
deformation. This study performs cycle loading experiments to high tension steel
part frames, and compares the initial rigidity and the yield strength of part frames
without diaphragm with that of part frames with diaphragm. In addition, these
experimental results are compared with the approximation of the reference.
Keywords: high strength steel, fracture, plate bending deformation, ultimate
strength, diaphragmless.
1 Introduction
The new steel named H-SA700 has been developed to decrease the alloy element
and to establish the streamlined process of heat treating in the project in Japan
during 2004 and 2008. In the view of cost, it is better than the steel used with
800N/mm2. The main seismic frame with this new high strength steel has the
possibility to keep elastic and the only damper becomes plastic, even though it is
subjected to a large earthquake. On the other hand, it is shown that this new high
strength steel has smaller fracture capacity and lower fatigue performance than
the used steel of SS400 and SM490 with ultimate stress of 400N/mm2–
Keywords
high strength steel, fracture, plate bending deformation, ultimate
strength, diaphragmless.
Related Book
Other papers in this volume
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