Evaluation of non-linear effects in steel cable-stayed bridges (in Polish) Ocena wpływów nieliniowych w stalowych mostach podwieszonych

In steel cable-stayed bridges, i.e., moderately long span structures, the contribution of nonlinear influence to static response and parametric modal and stability analyses due to hinges located along a deck of untypical cable-stayed bridge were studied. Moreover, the response of chosen steel one-tower cable-stayed bridge was discussed on the basis of detailed combined field tests and numerical calculations under static and dynamic loads. The influence of geometrical and material nonlinearities on the displacement, bending moment and axial force in selected arrangements of three- and multi-span cable-stayed bridges under dead and life loads was established. Theoretical analyses of planar 2D and spatial 3D models have been mostly conducted by FEM software Cosmos/M using suitable solution techniques for nonlinear schemes, such as these of Newton-Raphson, modified Newton-Raphson and BFGS, applying load and arc-length methods.