Naslov
Nonlinear numerical model in r/c bridges analysis

Autori
Trogrlić, Boris ; Mihanović, Ante

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
Proceedings of the International Conference on Bridges / Radić, Jure - Dubrovnik : Structural Engineering Conference (SECON) and Croatian Society of Structural Engineers (CSSE), 2006, 399-406

Skup
International Conference on Bridges

Mjesto i datum
Dubrovnik, Hrvatska, 21.05.2006. - 24.05.2006

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
R/C bridges; material nonlinearity; geometric nonlinearity; failure analysis

Sažetak
This paper presents a numerical model for failure analysis of reinforced-concrete bridges under a monotonically increasing load, from zero up to the ultimate load, i.e. collapse of the structure. The collapse of the structure occurs due to exceeding the limit load and/or losing of stability of space beam elements or whole structure. In general, the developed model describes material and geometric nonlinear behaviour of space beam structures of composite cross sections (pure R/C or combined with steel cross sections). Material nonlinearity is based on uniaxial constitutive law for materials in composite cross section what is, from engineer point of view, practical and more acceptable than constitutive law in 3D. Presented model also covers non-uniform torsion of 3D beam element in case of nonlinear behaviour of composite cross-sections. The equilibrium of the system on deformed geometry is achieved by the model of geometric nonlinearity according to Total Lagrange formulation with small displacements. Thereby, the loss of stability due to buckling caused by bending, torsional buckling and lateral buckling of the space beam element may occur. Discretization of numerical model is multi-level, as follows: global discretization on two-node beam element with 6 degrees of freedom per node ; fiber discretization of composite cross-section, and 3D discretization in order to describe non-uniform torsion but element by element in calculation of global stiffness matrix. Finally, two examples are studied to verify the accuracy of the program and demonstrate its application in practical bridge engineering.

Izvorni jezik
Engleski

Znanstvena područja
Građevinarstvo

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