Shear Resistance Mechanisms of Steel Sheet Walls with Burring Holes and the Effect of Wall Widths with Vertical Slits

摘要

Shear walls containing 2.73-m-long × 0.455-m-wide steel sheets with vertically aligned burring holes are employed in multi-story buildings in seismically active regions. A configuration with burrs on the inside enables the construction of thinner walls and simplified attachment of finishing. The machining of equipment and piping holes at the construction site can be omitted by the holes. In-line 1.82-, 2.73-, and 3.64-m-wide walls are employed in the buildings, with at least one vertical slit every 0.91-m-wide. The purpose of this study is to clarify the shear resistance mechanisms of walls with burring holes and the effects of wall widths with and without vertical slits. The wall that receives the in-plane shear force allows shear stress to concentrate in the intervals between the holes. Finite element analysis and shear experiments revealed that all intervals between the holes were simultaneously deformed and that the buckling areas in the intervals were restricted by the use of ring-shaped burring ribs of the holes. The postbuckling behavior was dependent on the shapes of the tension field on the intervals. The effect of vertical slits involved maintaining wall strength stable in the inelastic region. The formulas of the allowable design strength and the indexes of strength after shear buckling were developed.