## 6 Conclusions  
As a result of the evaluation of the structural health monitoring data via the applied fiber optic cable embedded in the raft plane of pile-raft foundations of a high-rise building at the initial stage of its operation, the following conclusions are presented:1. Fiber optic's monitoring made it possible to provide actual results of strains in the upper layer of the raft at the lowest level B4 of the 75-storey high-rise block of the Abu Dhabi Plaza building on multilayer soils of Astana city.
2. The compression strains were observed over the entire area of the building, with values from \(-20\) to \(-40\)\(\mu\varepsilon\). A greater value of compression strain, from \(-40\) to \(-60\)\(\mu\varepsilon\), was registered in the center in the Y-direction and along the eastern facade of the block R in the building core, with some points up to \(-60\) to \(-80\)\(\mu\varepsilon\).
3. The tension strains are concentrated along the extreme axes of the building, with a predominance in the southern part of the R block, as well as in the immediate vicinity of the columns, in a range from \(-20\) to \(-40\)\(\mu\varepsilon\), with separate spots from \(-40\) to \(-60\)\(\mu\varepsilon\).
4. Individual patches of tension strains near the columns were explained by the increased deflection of the raft under the application of a concentrated load (columns).
5. The deformations of \(600\)\(\mu\varepsilon\) (\(6\) mm m\({}^{-1}\)) or \(300\)\(\mu\varepsilon\) (\(3\) mm m\({}^{-1}\)) for the change in crack width require a local diagnostic examination with concrete sampling and testing for strength characteristics as part of the diagnostic survey.
6. When a strain above \(1000\)\(\mu\varepsilon\) (\(0.1\%\)) occurs, a basic structural analysis is recommended; above \(1500\)\(\mu\varepsilon\), a detailed structural analysis is required.
7. Fiber optic monitoring results at the time of testing did not exceed the permitted values for high-rise building operation; however, they characterized the general picture of the strain in the raft plane and made it possible to determine the initiation of cracks in concrete at an early stage.
8. According to the results of Plaxis 3D modeling, the largest difference in the vertical displacement was \(24\) mm and in the horizontal plane \(1\) mm within a distance from the center of the core up to \(30\) m, which is less than \(1\)\(\mu\varepsilon\) and does not indicate the potential areas of risk of cracking in the concrete raft but gives a general picture of loading and settlement of the building. Therefore, the fiber optic method provides a reliable data source for SHM.  
Conceptualization, A.S. and A.B.; methodology, A.S.; software, A.B.; validation, A.B., A.Z. and A.O.; formal analysis, A.Z.; investigation, A.B.; resources, A.B.; data curation, A.S.; writing--original draft preparation, A.S.; writing--review and editing, A.S.; visualization, A.O.; supervision, A.Z.; project administration, A.Z.; funding acquisition, A.B. All authors have read and agreed to the published version of the manuscript.  
This work was supported by the Science Committee of the Ministry of Education and Science of the Republic of Kazakhstan (Grant No. AP13268861).  
Not applicable.  
All related data can be obtained upon request from the first author.  
The team of authors would like to thank the managers of the Kazakh Research and Design Institute of Construction and Architecture, Director of the Information Center [PERSON], and Head of Department [PERSON], who provided guidance during field research and professional assistance in conducting laboratory experiments.  
The authors declare no conflict of interest.