## 2 Materials and Methods
### Database of Buildings
#### 2.2.3 Building Technical Condition Indicators  
The measure of the technical condition of a building structure is its technical wear \(s_{z}\) (e.g., [9]). In this study, the degree of technical wear was determined for individual buildings using the weighted average method, considering individual constructional and technological solutions. The examined objects are characterized by the degree of wear with average values from 17.8% in 2002 to 25.1% in 2012 for large-panel, and from 27.4% in 2002 to 36.7% in 2012 for large-block buildings. In order to investigate the contribution of damage to the technical wear of buildings, changes in damage intensity over time and the relationship between the extent of damage and the impact of mining exploitation, a qualitative index of damage intensity \(w_{ui}\) was determined for individual structural and non-structural elements (e.g., [21; 22]). A total of 22 elements were identified (Table 1), for which this index was defined on a 6-point scale, in which \(w_{ui}\) = 0 means no damage, \(w_{ui}\) = 1--insignificant damage (range from 0 to 10%), \(w_{ui}\) = 2--moderate damage (range from above 10 to 30%), \(w_{ui}\) = 3--intensive damage (range from above 30 to 50%), \(w_{ui}\) = 4 (and 5)--very intensive damage (range above 50%). Figure 2 shows examples of damage to the load-bearing structure and secondary components. The analysis of the value of the damage intensity index \(w_{ui}\) for individual building elements in the studied groups showed that there was insignificant, moderate or, in individual cases, intensive damage. \begin{table}
\begin{tabular}{c c} \hline \hline
**Designation** & **Index Description** \\ \hline \multicolumn{3}{c}{Components of load-bearing structure} \\ \hline \(w_{u1}\) & Intensity of damage to foundations \\ \hline \(w_{u2}\) & Intensity of damage to load-bearing walls of the basement or to foundation walls \\ \hline \(w_{u3}\) & Intensity of damage to interior and exterior overground load-bearing walls (including lintels and walls under windows) \\ \hline \(w_{u4}\) & Intensity of damage to firewalls \\ \hline \(w_{u5}\) & Intensity of damage to components of framed load-bearing structure (columns, transoms) \\ \hline \(w_{u6}\) & Intensity of damage to ceilings over basements \\ \hline \(w_{u7}\) & Intensity of damage to ceilings over higher levels, flat roof (roof covering) \\ \hline \(w_{u8}\) & Intensity of damage to stairs \\ \hline \(w_{u9}\) & Intensity of damage to balconies and loggias (as well as eaves and cornices) \\ \hline \(w_{u10}\) & Intensity of damage to roof structure \\ \hline \multicolumn{3}{c}{Secondary components (finishing elements)} \\ \hline \(w_{u11}\) & Intensity of damage to partition walls \\ \hline \(w_{u12}\) & Intensity of damage to internal plasters and wall cladding \\ \hline \(w_{u13}\) & Intensity of damage to floors (floor layers) \\ \hline \(w_{u14}\) & Intensity of damage to chimney walls \\ \hline \(w_{u15}\) & Intensity of damage to bracings (elements ensuring spatial rigidity) \\ \hline \(w_{u16}\) & Intensity of damage to infill (or curtain) walls \\ \hline \(w_{u17}\) & Intensity of damage to facade (facade layers) \\ \hline \(w_{u18}\) & Intensity of damage to damp-proof insulation \\ \hline \(w_{u19}\) & Intensity of damage to roofing \\ \hline \(w_{u20}\) & Intensity of damage to flashings, gutters and downpipes \\ \hline \(w_{u21}\) & Intensity of damage to joinery \\ \hline \(w_{u22}\) & Intensity of damage to exterior elements (entrances to buildings, platforms, terraces, wall trims, etc.) \\ \hline \hline \end{tabular}
\end{table} 
Table 1: Intensity indices of damage to components of a building structure [22]. Figure 2: Examples of damage to load-bearing basement walls \(w_{u2}\) (**a**) and facade layers \(w_{u17}\) (**b**). The damage intensity index of entire buildings was then determined as linear combinations of the indices describing the damage of their component parts.