Statical analysis of the roof structure in Šenk homestead protected as national cultural heritage site

摘要

This thesis presents the static analysis of the heritage protected Šenk homestead's roof structure with the use of the structural analysis program SAP2000. For this purpose I have analyzed the chronological decay of roof structure elements and made a parametrical study of six static roof structure models. The basic model has four frames with a trapeze shaped triple roof static system Mechanical parameters for the calculation of spruce elements (compressive strength, bending strength, elastical mosulus, shear modulus) for statical analysis were gained by laboratorical testing of spruce samples.udI have researched how gradual decay of the roof structure have influenced the deformation of the underlying stone walls. The northern walls are the most damaged with the widest cracks and are almost completely seperated from the rest of the house. Vertical reactions and displacemants of the roof wall plate roller supports were therefore the main focus of this analysis. Dead load, live load, snow load and wind load are assesed using Eurocode standards. Static analysis is based on the method of limit state load (MSN).udAnalysis shows that the main reason for the north wall deformation is the influence of deformed roof structure and ground setlement. The house is without a foundation and its walls sit directly on rocks that are laying in in soft gravel soil. The house was without gutters and drainage for a long time. Rainwater was therefore able to wash away the soft subgrade causing additional subgrade subsidence. The roof wall plate had to be supported at some point in time, which means that the north wall was without vertical load and consequently constant compressive stress, that had a positive effect on it. As a result the northern wall was able to deform even more. Point supported roof wall plate caused greatly increased horizontal reactions in NE and NW corner of the north wall, that have triggered the beginning of the formation of cracks.