GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.2 GNGTS 2023 coefficient in this situation is two to three orders of magnitude lower than that of regular strength concrete, chloride penetration into the concrete is prevented. As a result, which show the evolution of rebar cross sections, seem plausible. It should be noted that the FRP jacketing used in Alternative 3 can help to increase the pier's longevity in addition to restoring its mechanical performance because the external wrapping can greatly lower the rate of corrosion. Last but not least, the fourth intervention seems to behave the worst in a corrosive environment. The column's repairs aim to recreate the original, uncorroded pier's resisting moment (C212). The engineering of the solutions, however, resulted in slightly different final results from the desired values. The four solutions have slightly different resistive moments, with values ranging from 3868 to 4546 kNm. About ductility (C213), it should be noted that the ductility was adjusted to 0 in the case of the FRP intervention due to the material's brittle behavior. The existence of codes and regulations (C221), is seen as a vital factor and is frequently disregarded. Its inclusion is crucial because planning retrofitting measures is challenging. In the BIM system, material and construction costs (C311) are calculated by adding the cost parameter to each produced element. The costs are obtained from the region of Sardinia's construction cost list. Some parameters, such as the need of skilled workers (C421) are counted as values that can be 0, 0.5 or 1 at the discretion of decision makers. After the analysis has been conducted, it is possible to estimate that A2 (rebar replacement) is the most sustainable alternative for this study case. The relative closeness results of each alternative for each criterion are given in Table 1. Table 1. Relative closeness for first level criterion. A1 A2 A3 A4 C1 0 0.99 0.96 0.97 C2 0 0.99 0.98 0.96 C3 0 0.99 1 0.96 C4 0 0.99 0.98 0.97 The result of last level weighted alternatives are shown in Table 2.