合成スラブが鋼構造骨組の挙動に与える影響

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Currently there are no solid guidelines on how the composite actions between steel beams and floor slabs are considered in designing steel moment frames against earthquakes. How the composite action is considered has been left to each engineer's decision. Engineers may consider the benefit of the stiffness increase; however, the strength increase may conservatively be neglected. After the Kobe earthquake, adverse effects of the composite action on beam fracture have attracted an attention, which were caused by the shift of neutral axis toward the floor slab. This suggests a problem of the current design practice that ignoring the composite action may not be always conservative. This problem may be caused mainly due to the limited available research on the composite action. Therefore, the effects of the composite action on the seismic behavior are examined experimentally in this paper. Four H-shaped moment frames are prepared as specimens. There are two types among the four: I) traditional welded frame and II) all-bolted frame developed recently. For each type, two cases with and without a composite slab are examined, which have a relatively thin concrete slab with wire mesh reinforcement. The following main conclusions are obtained from the tests. 1) There are the benefits of stiffness increase and yield strength increase in both frame types. 2) The maximum strength does not increase, and the deformation capacity does not decrease because the composite action disappears in both types as the deformation increases due to compressive and splitting failure of the concrete slab.
一般社団法人日本建築学会の論文
2005-03-20

合成スラブが鋼構造骨組の挙動に与える影響

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