Cost Optimization of RC Beams Considering Steel Rebar Losses

Resumo

Optimization techniques are an efficient tool for developing structural projects. By seeking the rational use of available resources, they can not only reduce costs but also the impact on the environment. In this sense, it is interesting that these techniques are effectively incorporated throughout the process, including at the construction stage. For example, in the design of reinforced concrete structures, an additional 10 percent of steel consumption is usually foreseen due to losses from cutting rebar, which is supplied in standard lengths on the market. These losses can be significantly reduced if the bars are cut according to an optimized plan. This study aims to combine the optimization of the cost of reinforced concrete beams with the minimization of losses due to the cutting of steel bars. Initially, the two optimization problems were implemented separately and used sequentially, using the Harmony Search Optimization Method. Several simulations were then carried out to assess the influence of factors such as the number of beams and the number of gauges on losses and final costs. In a second stage, the aim is to integrate the two problems so that the reduction of losses can be optimized even during the design and detailing phase of the structure.