PSI - Issue 64

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Petr Tej et al. / Procedia Structural Integrity 64 (2024) 1089–1094 Author name / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 3. Views of the analysis model developed in LUSAS. Green elements = shells and purple elements = beams.

2.3. Approach to the repair of the stone viaduct The historic stone viaduct from the year 1 871 is also a part of the whole of the Vyšehrad Bridge (Fig.4). Today it is not in a good condition (Fig. 5) and its restoration is necessary to preserve the whole bridge structure. An assessment of the state of the structure was carried out. The vaults in question are in poor structural and technical condition. This condition is mainly caused by the constant inflow of rainwater and water that is absorbed from the transferred road.

Fig. 4. Historical drawing - longitudinal section of the viaduct between Vyšehradská třída and the beginning of the bridge.

The lack of functional drainage and waterproofing also contributes significantly to this condition. The repair thus involves the conservation of the original stone mass and surface. To preserve the historic surface of the stones, a microsandblasting method will be used for cleaning of deposits. The amount of water-soluble salts will be reduced by poultices. The viaduct will be re-grouted with grout with suitable properties - consideration will be given to vapour permeability and adequate strength. The composition of the mix will also be addressed in relation to the final overall appearance of the structure. The next step would be to place a concrete slab on top of the structure with cantilevers with suitable waterproofing and reinforcement of bridge arches. The upper part includes two railway tracks and cycle lanes. Glazing is proposed for the empty space under the arches and use of the space for services and retail.