In this thesis, various seismic retrofitting projects of buildings are examined from the perspective of construction costs and the evaluation of influencing parameters on these costs. In the first part of the thesis, typical approaches to seismic strengthening of buildings are presented, with a focus placed on the strengthening of reinforced concrete (RC) buildings by means of reinforced concrete walls. Methods for estimating the costs of seismic strengthening are briefly outlined and are classified into rapid methods, applicable when the level of knowledge about a building is low, and more detailed methods. The latter methods require that actual project data, the planned strengthening measures, and a bill of quantities based on the known amount of required materials, labor, and machinery be considered. In the second part, an estimation and analysis of costs is presented for the seismic strengthening of the main faculty building, a student dormitory, and a school center. Within the cost assessment, key works required for seismic strengthening are included, namely the construction of foundations, seismic reinforcements, and finishing works. Materials and elements consumed in larger quantities are also taken into account. The bill of quantities was prepared partly on the basis of preliminary assumptions and calculations of the works considered necessary. It was found that the costs of seismic strengthening of the analyzed buildings ranged between approximately 110 and 280 EUR/m² of net floor area, and between 30 and 85 EUR/m³ of building volume, with higher shares of new RC walls being associated with higher costs. When the strengthening costs are normalized to 1% of added RC walls relative to the building’s net floor area, they range between 15 and 26 EUR/m³. The variation in costs is thereby reduced from a factor of 2,7 to 1,7, but not to 1,0, since the differences in price are influenced not only by the quantity of added walls but also by other factors, the detailed analysis of which lies beyond the scope of this thesis.
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