| Title |
Varying Effective Widths of Steel-Concrete Composite Girders with Slits |
| Authors |
Hwang Sung-Chul ; Yang Il-Seung |
| Keywords |
Composite Girder ; Effective Width ; Slit ; Stud Connector ; Composite Effect ; Neutral Axis |
| Abstract |
In the bottom flange of failures steel girders has occurred in U.S. Northridge Earthquake or the Kobe Earthquake of 1995 Japan in 1994. The reason is stress concentration at the lower flange of a steel girder in the neutral axis position by the composite effect of a steel girder and concrete slab rising to the upper flange of a steel girder. General composite girder can increase the stiffness and strength under the positive bending moment compared with negative bending moment.
When horizontal load acts on the composite girder of steel girder-concrete slab repeatedly, this research is the examination object which installed 50mm slit in the concrete slab around the column. In order to make late the bottom flange fracture of a steel girder by accumulation plasticity transformation. As opposed to this slit type composite girder, it is research on the effective width of the concrete slab which becomes the standard of the elastic rigidity of a composite girder. The test specimens are "T" and "+" shaped subassembly frames.
We investigated change of the effective width of concrete slab from the end of a slit type composite girder at the time of positive bending moment. In order that a column may not receive the compression stress of concrete slab about slit type composite girder end effective width change and the nearest stud connector may receive the compression stress of concrete slab from a column, it spreads toward the central part from the position which has the nearest stud connector from a column. Although the effective width of the slit type composite girder central part spread from AIK, ACI [16.15] and LRFD-I3.1, it was near to design recommendations for composite constructions of AIJ. |