Optimization of welded structures for cost

Jármai, Károly (2000) Optimization of welded structures for cost. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 1 (2). pp. 149-166. ISSN 1586-2070

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Abstract

Weight or mass minimization is a usual way of finding optima of structures. Due to the high cost of welding, weight and cost optima can be quite different. We have worked out a cost calculation for welded steel structures, considering not only the material, but preparation, cutting, edge grinding, welding, cleaning, painting costs as well. We have used the backtrack combinatorial discrete optimization method for many years. We made weight minimization. For cost minimization we had to modify the algorithm in order to be able to handle cost function. This paper describes this modification. We show two examples for cost minimization: the first example is cost optimization of welded box beams with longitudinal stiffeners. First we show the economics of using stiffeners in the example. The second example is the effect of post-welding treatments on the optimum fatigue design of welded I-beams. We show how cost saving can be achieved by introducing additional treatment.

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