Simplified calculation of effective flange width for shear walls with flange

Summary The shear lag effect of shear walls with flange is normally analyzed by introducing the concept of effective flange width. Therefore, it is crucial to accurately evaluate the effective flange width for tall buildings design. In this paper, based on the energy variational method, the normal stress distribution in the flange of shear walls is deduced, and the analytical solution of effective flange width in elastic stage is obtained according to the stress equivalent principle. For simplification, a parametric study on a serial T-shaped cross-section shear walls was conducted using finite element method in order to clarify the characteristic of effective flange width along with the loading history and the variations of shear lag effect with different parameters accordingly. Based on the numerical results, simplified formulas of the effective flange width in different loading stages are deduced for practical structure design. Moreover, the rationality of the values derived from different design codes is evaluated by comparing with simplified formulas. Copyright © 2015 John Wiley & Sons, Ltd.

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