with a fictive E-modulus). Because the linear calculation resulted in compression in the tension bars a non-linear calculation was needed. Because of the light and slender character of the bridge there was also need to calculate the eigenvalues / frequencies of the bridge in order to check if there were risks of vibration under live load or wind actions. The calculation of the eigenvalues was done with the module of eigenvalues and masses in ESA-Prima Win. In the calculation of this project the use of ESAPrima Win was very intense and diverse: • Combination of 1D and 2D-elements in one model • Non-linear calculation • Stability control • Calculation of eigenvalues Description of our experience with ESA-Prima Win when realizing the project The challenge in the calculations of the project was found in the design of a slight and slender structure for a big span without losing the control of deformation and vibration of the structure. For this ESA-Prima Win was the most suited software because of the variety of possibilities to check the structure to the limit, based on linear calculations, non-linear calculations, EC3 steel check control, stability control and eigenvalues calculations in one software program. This could be done in a very easy to use and clear software environment. Used modules • Base • 3D frame • 3D shell • Stability frame • Physical non-linear conditions • Dynamics frame • Steel code check (EC3) 85
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