Steel Panel Encased R.C. Composite Shear Wallsby Minoru Yamada, Kansai Univ, Suita-Osaka, Japan,
Abstract: In order to make clear the fundamental resisting mechanisms of composite shear walls, tests are carried out on the composite unit rigid frames with various infilled shear walls. Composite shear walls are classified into the following three fundamental types; (a) reinforced concrete shear panel infilled in composite frame, which are already in common use, (b) steel band bracing embedded in reinforced concrete shear panel, which belongs to the so-called open web panel type, (c) steel panel with or without covering reinforced concrete shear panel, which belongs to the so-called full web panel type. Test results show that the resisting mechanism of reinforced concrete shear panel infilled in composite rigid frame is composed of diagonal compression field of the infilled concrete, therefore the initial stiffness, ultimate resistance become very high. But because of the compression fracture of concrete, deformability is very small (such as 0.005 in story sway angle). Through the formation of diagonal compression field of concrete, the surrounding frames are expanded to outsides. On the contrary, the resisting mechanism of steel panel infilled in rigid frame is composed of diagonal tension field of the buckled steel panel; therefore, the initial stiffness is not so high but through the formation of diagonal tension field the ultimate strength is fairly high. The plastic deformation is generally very large because of tensile yielding of steel. The surrounding frame are contracted into inside through the diagonal tension of the buckled shear panel. The optimum combination of these two fundamentally opposite resisting mechanisms of infilled reinforced concrete or steel shear panel, makes it possible to control the aseismic characteristics of a composite structure.
Subject Headings: Shear walls | Reinforced concrete | Panels (structural) | Composite structures | Concrete frames | Steel structures | Shear tests | Steel frames
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