Članek opisuje sistem optimalnega projektiranja jeklenih okvirnih konstrukcij v skladu z evropskim pred-standardom ENV 1993-1-1, znanim tudi pod imenom Eurocode 3. Celoten problem je zapisan v obliki ...matematičnega programa. S pomočjo zunanjih kazenskih funkcij smo matematični program pretvorili v brezpogojno obliko in ga nato reševali z metodo konjugiranih gradientov. Glavni del algoritma smo modificirali tako, da se je optimizacija izvajala samo na delu neznank problema - nad enim prečnim prerezom, pri čemer so bile ostale neznanke - ostali prečni prerezi - fiksirane. Taka modifikacija je sicer malo povečala računske čase, je pa zato tudi povečala konvergenčni radij optimizacijskega algoritma
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