GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 2.2 GNGTS 2023 This research uses one single column out of the two of the pier as a case study. This is 3850 mm high and has a circular cross-section with a diameter equal to 1200 mm. The normal strength concrete (NSC) used to construct the bridge column has a nominal compressive strength and associated strain of 30 MPa and 0.2 percent, respectively, while the softening branch experiences zero stress at 0.4 percent strain. The concrete cover has a depth of 40 mm, and the estimated axial force on a single column is 4500 kN. Twenty 24 mm diameter rebars are set in a single concentric circular layer, and a spiral with a diameter of 12 mm and a pitch of 250 mm serves as the transverse reinforcement. The yielding stress is 536 MPa, the ultimate stress 649 MPa, and corresponding strain for the uncorroded reinforcing steel bars 11.6%. The pier is considered as a cantilever element, not considering the effect due to the frame. Fig. 1. Model of the Brabau bridge pier analyzed. Alternatives of intervention The aim is to assess the sustainability of four post-collapse rehabilitation interventions through a multi-parameter approach. To estimate the needed material quantity and all the mechanical data required for the subsequent evaluations, the alternatives are designed, analyzed, and modeled using BIM (Building Information Modelling) and FEM (Finite Element Modelling) models (Fig. 2).