Inclusion of P–Δ effect in displacement‐based seismic design of steel moment resisting frames |
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Authors: | Aristidis V Asimakopoulos Dimitris L Karabalis Dimitri E Beskos |
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Institution: | Department of Civil Engineering, University of Patras, GR‐26500 Patras, Greece |
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Abstract: | A procedure for treating the P– Δ effect in the direct displacement‐based seismic design of regular steel moment resisting frames with ideal elastoplastic material behaviour is proposed. A simple formula for the yield displacement amplification factor as a function of ductility and the stability coefficient is derived on the basis of the seismic response of an inelastic single degree‐of‐freedom system taking into account the P– Δ effect. Extensive parametric seismic inelastic analyses of plane moment resisting steel frames result in a simple formula for the dynamic stability coefficient as a function of the number of stories of a frame and the column to beam stiffness ratio. Thus, the P– Δ effect can be easily taken into account in a direct displacement‐based seismic design through the stability coefficient and the yield displacement amplification factor. A simple design example serves to illustrate the application of the proposed method and demonstrate its merits. Copyright © 2007 John Wiley & Sons, Ltd. |
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Keywords: | P– Δ effect seismic design displacement‐based design plane steel frames moment resisting frames stability coefficient yield displacement amplification factor |
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