Abstract
A practical minimum weight design algolithm is presented for such large scale problems as the design of spatial framed structures under multiple loading cases. The stress, local buckling of plates, slenderness ratio, displacement and minimum size constraints specified by the design codes are considered in the optimum design. For the development of a practical programming system with high efficiency, new mathematical and numerical methods, such as modified SLP, surplus variables and the other several technique, are employed. Efficiency and reliability of the design system are demonstrated by numerical calculations for large scale problems in the design of actual bridges.
