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Journal of Structural Engineering / Volume 137 / Issue 12 / TECHNICAL PAPERS

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Effective Stiffness of Squat Structural Walls

J. Struct. Eng. 137, 1470 (2011); http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000386 (10 pages)

Bing Li1 and Weizheng Xiang2

1Associate Professor, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore 639798 (corresponding author). E-mail: cbli@ntu.edu.sg
2Senior Engineer, Det Norske Veritas (DNV), Singapore; formerly, School of Civil and Environmental Engineering, Nanyang Technological Univ., Singapore 639798.

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(Submitted 19 May 2009; accepted 14 January 2011; published online 15 November 2011)

Reinforced concrete (RC) structural walls are the primary lateral-load carrying elements in many structures designed to resist earthquakes. A review of the technical literature shows considerable uncertainty with regards to the effective stiffness of these structures when subjected to seismic excitations, which many design practices currently deal with by employing a stiffness reduction factor. In an attempt to obtain additional information regarding the stiffness of these structures, an analytical approach, combining the flexure and shear components of deformation, is proposed to evaluate the effective stiffness of the RC walls tested. Based on this proposed analytical approach, a comprehensive parametric study comprising 180 combinations was carried out and a simple equation for assessing effective stiffness of RC squat structural walls then proposed, on the basis of these parametric case studies.

© 2011 American Society of Civil Engineers

Article Outline

  1. Introduction
  2. Previous Research in Evaluating Effective Wall Stiffness
    1. Research Conducted by Fenwick and Bull
    2. Research Conducted by Paulay and Priestley
    3. NZS 3101
    4. ACI 318-08
  3. Stiffness Characteristics
    1. Effective Stiffness
      1. Flexural Deformation Determination
      2. Shear Deformation Determination
      3. Combination of Shear and Flexure Response
      4. Validation of the Proposed Approach
  4. Parametric Study for Effective Stiffness of Squat Structural Walls
    1. Influence of Aspect Ratio
    2. Influence of Axial Load
    3. Influence of Longitudinal Reinforcement Content in Wall Boundaries
    4. Influence of Yield Tensile Strength of Longitudinal Bars in Wall Boundaries
  5. Proposed Equation for Moment of Inertia of Structural Walls
  6. Comparisons of Analytical Stiffness Ratios with Tested Results
  7. Conclusions

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ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000386

PUBLICATION DATA

ISSN

0733-9445 (print)  
1943-541X (online)

Publisher

American Society of Civil Engineers

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