Ductility in Earthquake Resisting Squat Shearwalls

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Title: Ductility in Earthquake Resisting Squat Shearwalls

Author(s): T. Paulay, M. J. N. Priestley, and A. J. Synge

Publication: Journal Proceedings

Volume: 79

Issue: 4

Appears on pages(s): 257-269

Keywords: compressive strength; damping capacity; diagonal tension; ductility; earthquake resistant structures; flexural strength; load-deflection curve; reinforced concrete; reinforcing steels; shear strength; shearwalls; stiffness; tests.

Date: 7/1/1982

Abstract:
The possibilities of achieving an acceptable level of energy dissipation in squat shearwalls, mainly by flexural yielding, are examined. Mechanisms of flexural and shear resistance are reviewed with em-basis on aspects of sliding shear. The response of four test walls with rectangular or flanged cross sections to simulated seismic foad-rg is discussed. Detrimental effects of sliding shear are demonstrated together with improvement achieved by use of diagonal wall reinforcement. It is postulated that critical parameters of sliding gear during inelastic seismic response are ductility demand, vertical web reinforcement in providing dowel shear resistance, and aspect ratio h,&. The aspect ratio may be expressed by the magnitude of neutral axis depth relative to wall length. Approaches for determining a desirable amount of diagonal shear reinforcement to control sliding and necessary horizontal shear reinforcement to prevent diagonaf tension failure are presented. It is postulated that with suitably arranged diagonal wall reinforcement a predominantly flexural response mode with good energy dissipating characteristics can be received n squat shearwalls.