The static-strength analysis is an extremely important and important part of the research. It should provide data on the behavior of the building, as well as its individual structural elements and materials, under the action of constant and service load and reveal the type and extent of deformation. By comparing the detected deformations with those considered to be dangerous, the analysis should show the general equilibrium conditions of the above-ground parts of the structure, specify the mechanical strength of the wall structure and the load-bearing capacity of the basic elements.
Particular attention should be paid to examining the condition of the foundations and the pressure, which prevails under the spread footing in the given static working conditions. In vertical load-bearing elements (walls, poles, columns etc.) it is not only the prevailing forces that should be examined, but also the state of stress, especially in weakened sections, taking into account the actual deformations found.
The static and strength tests of all covers should be carried out with the same care (ceilings, vaults etc.).
Static and strength calculations are performed not only after the completed testing process, but also during the observation period, with different static assumptions, especially when new damage or deformations are revealed in the course of observation and research. It is necessary due to the need to determine the actual stage of the statistic and strength work of the entire building or its separate structural units., because when deep scratches and cracks appear, the set of masonry structures stops working as a spatial structure, because it becomes a combination of links not related to each other. These cells, exempt from subordination of the parent system, they can move and rotate independently of it and of the neighboring links, creating a completely different structure in terms of static and strength, new layout.
Performing control calculations during the observation of the system is also necessary due to the need to determine the behavior of the materials at a given stage of work and to determine their characteristics..
In all cases, when doubts arise as to the quality of the materials, of which the tested structure is made, laboratory tests of the mechanical and physical properties of these materials are carried out on samples taken from these parts of the structure, which make it possible to do so without risking the stability and strength of the system and in which it is possible to later fill the defect imperceptibly.
Samples should be taken in the natural state, and laboratory tests should take into account both the operating state under normal conditions, as well as in the event of the action of destructive factors, especially when the building is exposed to weather conditions and moisture.