Nemetschek Engineering User Contest 2009 • Category 2: CAE Housing & Buildings 93 2 Public Transport Terminal, Central Station, Utrecht structure. At this point the main roof girder is split into two separate tubes serving as upper and lower edge of the “Vierendeelliggers”. The fire resistance of the main steel superstructure itself is established at 30 minutes. The application of Sprinkler systems prolongs the fire resistance by 30 minutes and due to a low fire load another 30 minutes can be added, totalizing to a fire resisting period of 90 minutes. Because of the fact that the traverse is surrounded by high-rise buildings wind tunnel tests were carried out. Results from the tests are integrated in the design parameters and measures as local increase in wind loading are applied into the design. In relation to wind loadings an analysis of the frequencies of the total roof superstructures was executed. The use of Scia Engineer software For the analyses of the steel structures the Scia Engineer software is used because the double bent roof definitely needs 3-dimensional analyses. Originally the main model was shaped with the 3D AutoCAD package and the result is read into Scia Engineer. To the basic model all other structural elements and conditions are added. As the wind- and stabilizing elements can only transfer tensile forces, these elements are introduced as nonlinear members. Consequently all structural members are tested on results from non-linear analyses. Buckling lengths and the verification of the Codes, as well as the analyses of deformations are done by using Scia Engineer. In relation with the wind tunnel tests determination of the natural frequencies, the dynamic properties, is established in order to compare the test results with the basic assumptions as mentioned in the Codes. Link: http://www.movares.nl/Projecten/Stations/ OV+Terminal+Utrecht+Centraal.htm
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