Műszaki Tudományos Közlemények vol. 18. (2023) 49–52. DOI: Hungarian: https://doi.org/10.33895/mtk-2023.18.09 English: https://doi.org/10.33894/mtk-2023.18.09 FLOOD PROTECTION PARTIAL ANALYSIS OF THE OLT BRIDGE IN SÂNTIMBRU Zsombor KISFALUDI-BAK, 1,2 F.-Zsongor GOBESZ 3 1 Transylvanian Museum-Society, Department of Technical Sciences, Cluj-Napoca, Romania, kisfaludi.zsombor@eme.ro 2 Technical University of Cluj-Napoca, Department of Structural Engineering, Cluj-Napoca, Romania, zsombor.kisfaludi@mecon.utcluj.ro 3 Technical University of Cluj-Napoca, Department of Structural Engineering, Cluj-Napoca, Romania, go@mecon.utcluj.ro Abstract In many places in Transylvania, we can observe the ruins and remains of buildings, from which many inter- esting conclusions can be drawn. As part of a more comprehensive research, in which the flood protection safety of old Transylvanian bridges is examined, in this case the rebuilt road bridge in Santimbru was in- vestigated. Modelling and hydraulic calculations performed on the basis of in situ measurements can reveal the old hydraulic construction requirements used in the design of the bridge, and then the data were also considered in the light of today's standards. Keywords: technical history, bridge design, flood . 1. Introduction The examined bridge over the Olt River in Sân- timbru (Csíkszentimre in Hungarian) is locat- ed on the county road number 133 in Harghita County, Romania, and probably adds to the list of bridges that were blown up in September 1916 by the retreating Austro-Hungarian army. The origi- nal design plans of the bridge are not known, but the structure is not unique on the Olt River, sim- ilar bridges were built in Sâncrăieni (Csíkszent- király), Sfântu Gheorghe (Sepsiszentgyörgy) and Fig. 1. The image of the old Olt bridge in Santimbru on a postcard from 1912. [1] Fig. 2. The current state of the old bridgehead. other places. A postcard illustrating the original state of the bridge is shown in Figure 1. Figure 2 proves that the railing at the bridgehead, which is completely different from the current railings on the bridge's superstructure, corresponds to the one shown on the old postcard. According to the Hungarian text carved on a plaque on the bridgehead (Figure 3): „The re- newal of the Olt bridge was carried out in 2016 by the town hall of the settlement, with the fi- nancial support of the Harghita county council,