FRP-Strengthening of Stretched Parts of Structural Elements by Cascade Multilayer Method

Alexander Danilov
2019 IOP Conference Series: Materials Science and Engineering  
The purpose of research is the analysis of applicability and effectiveness of cascade type multilayer models in design of structural elements strengthening by gluing on their surfaces fiber reinforced polymers (FRP). Materials and methods: variants of using the FRPreinforcement for stretched and bent elements with application of FEM simulation and analytic approach. A number of diagrams and tables represent the results. Design examples include the analysis of the adhesive joints application to
more » ... ttach FRP elements. Results are: justification of an efficient and cost-effective method of strengthening the stretched and/or bent elements to increase their bearing capacity reserves, the features of the bonded joint behavior, the equations and formulae for analysis and design. Analytical expressions are obtained and presented for designing the cascade strengthening schemes. Conclusions: the expression "cascade" reflects the features of the proposed strengthening layout, the reinforced (base) element unloading progress gradually along its length with each successive reinforcement element (strengthener) attached. The results suggest the possibility of effective use of adhesive joints to strengthen rather strong, including steel, elements. The cascade method allows to diminish the strength level of applied materials, thereby reducing the cost of reinforcement structures and increases the safety level of the reinforcement structure. For the same layouts but with tapes of E = 20 Gpa (glass fiber) the results change (table 5) .
doi:10.1088/1757-899x/661/1/012064 fatcat:tstanzitajfitnp5jam2unalhu