Nonlinear numerical model in R/C bridges design (CROSBI ID 552641)
Prilog sa skupa u zborniku | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Mihanović, Ante ; Trogrlić, Boris
engleski
Nonlinear numerical model in R/C bridges design
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.
R/C bridges; material nonlinearity; geometric nonlinearity; failure analysis
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Podaci o prilogu
399-406.
2006.
objavljeno
Podaci o matičnoj publikaciji
Proceedings of the International Conference on Bridges
Radić, Jure
Dubrovnik: Structural Engineering Conferences (SECON) and Croatian Society of Structural Engineers (CSSE)
953-95428-0-4
Podaci o skupu
International Conference on Bridges
predavanje
01.01.2006-01.01.2006
Dubrovnik, Hrvatska