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., Zhang, N. S., & Lee, G. C. (2015). Cyclic loading test of unbonded and bonded posttensioned precast segmental bridge columns with circular section. Journal of Bridge Engineering , 21(2), 04015043. Dai, L., Wang, L., Zhang, J., & Zhang, X., 2016. A global model for corrosion-induced cracking in prestressed concrete structures. Engineering Failure Analysis , 62, 263-275. Dewit, N. (2012). A Composite Structural Steel and Prestressed Concrete Beam for Building Floor Systems. Di Ludovico, M., Nanni, A., Prota, A., & Cosenza, E., 2005. Repair of bridge girders with

their shells, taking into account all three types of foundations (A, B and C) and with the assumption of elastic-plastic model of steel. The stress-strain relationship for structural steel consisted of a linear and perfectly plastic region: f y = 235 MPa, e y = 0.1119 %. These relationships for the foundation of type A and B are presented in Fig. 7 ; other cases will be analyzed in point 5 ( Fig. 8 , Fig. 9 ). These relationships are of great practical importance, because on the basis of quite easy measurements of u r deformations of the lower part of the shell