Volume and cost minimization of a displacement-constrained tubular truss

222 ABSTRACT: A simply supported planar truss with N-type bracing is optimized for minimum volume and cost. The lower chord of the truss is horizontal, but the symmetric upper chord parts are nonparallel and their inclination angle as well as the cross-sectional area of CHS (circular hollow section) rods are optimized. For the calculation of required cross-sectional area of compression struts closed formulae are used as a good approximation of Eurocode 3 buckling curve. A special method is developed for the minimum volume design considering the deflection constraint. In the case of a strong displacement constraint the cross-sectional areas required for the allowed deflection are larger than those required for stress and buckling constraints. The cost function includes the cost of material, cutting and grinding of CHS strut ends, assembly, welding and painting. Special mathematical methods are used to find the optima in the case of a numerical problem.

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