Methodology for Evaluating the Stress-Strain State of Strengthened Concrete Pipe Using the Finite Element Method with FEMAP with NX Nastran

Transport infrastructure plays a crucial role in the economic and defense capabilities of a state. One of the prerequisites for the safe passage of vehicles is the proper technical condition of the infrastructure, especially on roads and railways. The most common types of transport engineering structures are concrete pipes. However, the majority of concrete pipes are subjected to long-term exposure to variable environmental conditions and loads from transportation, leading to damages and defects in the pipes. The occurrence of defects and damages results in decreased capacity for traffic flow and transportation efficiency. Consequently, repair measures are required. The technology for strengthening concrete pipes using modern structural solutions is provided, along with a justification for selecting the appropriate technology for strengthening defective concrete pipes. A methodology for assessing the stress-strain state of strengthened concrete pipes using the finite element method has been developed. The stress-strain state of strengthened concrete pipes has been evaluated using the finite element method with the FEMAP with NX Nastran software package. Through the investigation, it has been established that in theoretical calculations, the maximum discrepancy in deformations compared to experimental testing does not exceed 10%. This confirms the effectiveness of utilizing the finite element method for predicting the behavior of strengthened structures using the sleeve method and can be considered a reliable tool for engineering analysis in similar studies. The obtained results can be practically utilized for repairing defective concrete pipes during operation.