Shear walls in which sheets with burring-holes aligned along the vertical direction are fastened to frame members, are applied to multi-story buildings. The walls that receive in-plane shear force allow shear stress to concentrate in intervals between the holes. Shear stiffness of the wall was gradually decreasing according to the deformation increasing. All intervals were simultaneously deformed and the deformation areas were limited in the intervals by ring-shaped-burring-ribs. Shear walls behavior at large deformation depended on the tension field on the intervals. The effect of the thickness of sheets is evaluated and estimating methods for the design values are developed.
The number of cold-formed steel framed houses is increasing and they tend to be built as apartment houses rather than detached houses. Along with this trend, heavy-floor impact sound insulation performance of the houses is expected to be improved. In order to meet this expectation, experimental test and numerical analysis are carried out, using the really-constructed houses as specimens. The results indicate, 1) in order to improve the heavy-floor impact sound insulation performance of cold-formed steel framed houses, sound pressure in a frequency band of 63 Hz has to be reduced, 2) floors of cold-formed steel houses tend to vibrate in a perpendicular direction to floor joists axis in the low-ranged frequency band, which is caused by the anisotropy of floor bending stiffness, 3) considering the vibrating mode shape, to improve sound insulation performance, it seems one of the solutions to increase the floor bending stiffness of weak axis, and 4) the possibility of the suggested solution is confirmed through the on-site test.
In-plane stiffness of dryly built-up steel floor made of flat and corrugated plate is evaluated with using theoretical formulation and physical test. They indicate, 1) dryly built-up floor alone can satisfy required stiffness; 2) it is difficult to satisfy required stiffness when the floor is connected to beam by self-drilling screw; and 3) stiffness of built-up steel floor can be estimated by theoretical formulation shown herein with the accuracy between 0.8 and 1.4 as the ratio of test result to the theoretical value.
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