The article presents partial results of laboratory research into physical and mechanical characteristics of materials most commonly used as walling units in masonry structures of historic and heritage buildings. Core boreholes and specimens for the laboratory research of selected characteristics were sampled from accessible places of historic buildings, which had not been restored or reconstructed.The results of the research brought new knowledge about the unreliability (variance) of the properties of historical, mainly natural building materials, and, at the same time, pointed out the need for further research and extension of knowledge necessary for the assessment of residual physical and mechanical characteristics of historic masonry structures.
The issues of the response of buildings to dynamic loading effects caused by natural seismicity have become a focus of great interest worldwide. According to the latest observations and calculations, the seismic hazard for buildings, mainly in seismically active regions of the Czech Republic, has increased, together with the area of the territories where buildings must be assessed for seismic effects. It is primarily historic and listed buildings with vaulted structures, or even partially damaged ones, that are exceptionally sensitive to the deformations of the supporting structure due to natural seismicity, and their response to these effects is often accompanied by the appearance of structural failures.
The demountable precast reinforced concrete building system consists of bar and thin-walled units allowing designing hybrid integrated systems of multi-storey buildings. The system’s characteristic property are demountable, self-rectifiable and dry joints enabling assembly without wet processes and, in case of need, the disassembly and relocation of the structure. The system applies special mounting, the joint of prestressed hollow core floor units and the load-bearing structure by steel pins additionally embedded in the hollow cores. The article presents the results of experimental research into the major parts and joints of the load-bearing system and the verification of the load-bearing system’s prototype exposed to static load tests with an example of the load-bearing system’s assembly and disassembly.
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