engleski

Numerical analyses of PC girders reinforced with different combinations of tendons

This paper presents the numerical analyses of the prestressed concrete girders from the engineering practice (prefabricated element), which were reinforced with various cross-sectional area of prestressing reinforcement. During analyses next parameters were observed: deflections of the girders, concrete stresses and strains at the top and bottom of the girders, compressive and tensile strains of the reinforcement. Numerical analyses were performed with the model for static analysis of prestressed structures. Numerical models for concrete and reinforcement were implemented in the computer programme PRECON3D for a 3D analysis of the prestressed and reinforced concrete structures where the structures are discretized by three-dimensional finite elements with embedded one-dimensional finite elements of reinforcement and prestressed tendons. Nonlinear triaxial behaviour of concrete is involved in this model, including all dominant influences in concrete. The nonlinear behaviour of classical and prestressed reinfoecement was described by the one dimensional elasto-viscoplastic model. The tendon geometry is described by the second order space function which is determined by its projections.

experimental testing; numerical simulation; real size concrete specimen; reinforcement

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