A Comparative study of AISC360 and EC3 provisions for member stability

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The purpose of this thesis is to compare the stability provisions of AISC360 and EC3 specifications. AISC360 specification introduces two methods for member stability which are Effective Length Method (ELM) and Direct Analysis Method (DM). ELM uses effective length factor (K) which is a function of support and side-sway conditions and directly influences the buckling load. On the other hand, DM assumes the effective length factor K=1 for all support conditions. Moreover, due to inelasticity, DM uses reduced axial and bending stiffness. To take into account destabilizing effects (imperfections) on the structure, AISC360 offers notional load for both methods. Similarly, EC3 takes into account these destabilizing effects with sway and bow imperfections which consist of equivalent lateral loads. EC3 has a more direct approach which eliminates the use of effective length and therefore buckling checks. In this approach, additional notional loads are applied. In this thesis, individual fixed base members with different cross sections and two dimensional plane frames with different slenderness ratios were studied in detail according to these specifications. Results indicate that, DM, ELM and EC3 provisions give similar axial load capacities. Moreover, minor differences exist in moment capacities of DM and EC3. However, ELM gives smaller moment capacities compared to other analysis methods, generally.


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Citation Formats
Ö. Kevran, “A Comparative study of AISC360 and EC3 provisions for member stability,” M.S. - Master of Science, Middle East Technical University, 2016.