Improvement of Calculation for Determining the Deflections of Flexible Non-centrally Compressed Reinforced Concrete Poles Strengthened with Composite Materials in the Transverse Direction

The analysis of calculation methods stated in the normative literature on strengthening of reinforced concrete structures with composite materials located in the transverse direction by wrapping the structures showed that there is no calculation method for the second group of limiting states. Code of Rules 164.1325800.2014 “Strengthening of reinforced concrete structures with composite materials” does not consider options for strengthening flexible compressed reinforced concrete structures, with the location of composite materials in the transverse direction, introducing restrictions on the dimensions of structures. However, our research suggests the opposite. This paper gives experimental values of deflections of strengthened concrete reinforced poles in transverse direction with composite materials, characteristics and test procedure of experimental specimens. The results of theoretical calculation of deflections are presented and, on the basis of comparison of experimental and theoretical values of deflections, the algorithm of calculation according to the second group of limiting states has been developed. A new deflection calculation algorithm has been developed for poles strengthened in the transverse direction. Corrections to the calculation of the elastic modulus of concrete Eb1, by introducing the coefficient \({k}_{f5}\) , for the poles “without cracks” are offered and the value of the relative deformation of concrete Eb1,red for the poles “with cracks” is corrected.