Application of Computer Modeling for Accounting of Temperature Deformations of Reinforced Concrete Structures During Geodetic Monitoring of Construction

The article addresses the problem of accounting for temperature deformations of high-rise reinforced concrete buildings during geodetic monitoring of construction. Existing approaches that require significant hardware and human resources are reviewed. An alternative method is proposed, based on computer modeling of deformations of all reinforced concrete elements of the building caused by thermal expansion, using the LIRA-SAPR software complex. The process of creating a three-dimensional finite element model of a 23-story building is described. A comparison is made between the calculated displacements of the model nodes and the actual coordinates of cataphot marks measured by an electronic total station. It is established that for the lower floors the discrepancy between the model and field data is small, while for the upper floors a significant discrepancy is observed. The main reasons for the discrepancies are the angle of incidence of the sighting beam on the reflector, vertical refraction, and automatic determination of reinforcement without manual adjustment. It is concluded that computer modeling is fundamentally applicable for accounting for temperature deformations. However, the constructed model requires refinement, and during experimental verification it is necessary to take into account the indicated instrumental errors and perform interpolation of displacements between nodes for marks located outside the node grid. It is recommended to use corner film or prism reflectors to improve measurement accuracy on the upper floors.