earticle

영어

The fracture of H section steel girder end lower flange was intensively generated as an earthquake disaster of the steel structure generated in the Japanese HYOGOKEN southern part district in 1995. In the case of the steel frame group composition girder with which H section steel girder end lower end flange fracture cause united H section steel girder and concrete slab, since it goes up to near the top flange of a composite girder, a lower flange becomes easy to fracture the position of a plastic neutral axis with a positive moment. therefore, it is indicated that it is
important to clarify influence of the concrete slab which attains to the plastic deformation capability of a composite girder at the time of the occurrence of an earthquake.
A steel structure composite girder differs a positive moment part and negative moment in elastic rigidity. In a positive moment part, the price of elastic rigidity changes with concrete slab thickness. It expresses with the elastic rigidity value in consideration of the influence of a steel girder and a steel rod which disregarded the influence of concrete slab in a negative moment part.
The steel structure building of the present most is using the composite girder. however, the earthquake response analysis of the steel frame group building is performing the earthquake response analysis as a malleable steel structure which disregarded composite effect by the thickness of concrete slab. This research conducted seismic response analysis to the inside low layer steel frame building. comparison examination of the difference of the maximum displacement, the maximum relative story displacement, and absorbed energy was carried out to the case where the thickness of the case where composite effect by the thickness of the concrete slab in the same conditions is taken into consideration, and concrete slab is disregarded. The own
natural period of a building changes with composite effect, and the damage concentration story expected by plastic deformation
capability change changes.