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Equivalent notional load

Kanchanalai, adjusted exact

FIGURE 5.20 Comparison of strength curves for a portal frame subject to strong-axis bending with Lc/rx = 60, Ga = 0 (equivalent notional load method).

Equivalent notional load

Kanchanalai, adjusted exact

FIGURE 5.20 Comparison of strength curves for a portal frame subject to strong-axis bending with Lc/rx = 60, Ga = 0 (equivalent notional load method).

When the reduced tangent modulus factor of 0.85 is used for portal and leaning column frames, the interaction curves generally fall between the plastic zone and LRFD curves. In portal frames, the conservative error is less than 8% (better than 11% error of the LRFD) and the maximum unconser-vative error is not more than 5% (Figure 5.22). In leaning column frames, the conservative error is less than 7% (better than 17% error of the LRFD), and the maximum unconservative error is not more than 5% (Figure 5.23).

5.3.3 Six-Story Frame

Vogel [35] presented the load-displacement relationships of a six-story frame using plastic-zone analysis. The frame is shown in Figure 5.24. Based on ECCS recommendations, the maximum

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