抄録
The structural behaviors of continuously spanned composite beams in steel frames are investigated. Three of 1/3-scale models of one-story three-span steel frames with/without reinforced concrete (RC) slab were tested under lateral cyclic loading. The inner RC slab in a positive moment was subjected to larger compressive strain than the exterior RC slab, and also the larger number of shear connectors (headed studs) in composite beams resulted in a slight increase of compressive strain at the inner RC slab in a positive moment and even in a negative moment. The authors pointed out that the composite beams, even if assumed to fail in axial compression at RC slab, may fail in shear at studs because of the fact that the apparent shear strength of studs decreases with the number of studs increasing. Furthermore, the authors proposed the strain amplitude evaluation for the bottom flange of composite beams under cyclic loading.
