Numerična analiza mehanskega odziva naknadno prednapetega betonskega nosilca z nepovezanimi ukrivljenimi kabli
Numerical analysis of a posttensioned concrete beam with unbonded curved cables

slovenian

2024

continuous beam   curved cables   numerical model   post-tensioning   prestressed concrete   simply supported beam

Zveza društev gradbenih inženirjev in tehnikov Slovenije
(Obvezni izvod spletne publikacije)

The paper presents a mathematical model and a corresponding numerical procedure for the analysis of the mechanical response of a post-tensioned concrete beam with unbonded curved cables under short-term static loading. The concrete part of the beam, which can be reinforced with soft reinforcement, is modeled with Reissner's in-plane beam model and the prestressed cables running inside the concrete beam are modeled with the rope model. It is assumed that the cable and the concrete beam may displace side-by-side, but cannot displace apart at the point of contact between them. The phenomena of localization of deformation and softening of the concrete under compression, which usually occur at high loads, are modeled with a well-established »crack-band« model, which limits these phenomena to the finite length of the beam. The suitability and accuracy of the developed model is demonstrated by comparing numerical and experimental results of a simply supported and a continuous beam, for which well documented experimental results are available in the literature. Finally, a very good agreement of the results is found.

22.05.2024