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November 2004 |
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  You still have time until 30/11/04 for the SCIA USER Contest 2004/2005 - Subscribe today...Due
to the Armistice Day, the SCIA head office in Belgium will be closed on 11 and 12 November 2004. Support however can still be obtained on the usual numbers or by e-mailThe
next ESA-Prima Win training will be organized in Arnhem (NL) on 15/16/19 November 2004.
Contact for more information or consult our Online Training Calendar
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 Dear eNews reader - in this November issue we have gathered again a lot of interesting items, some hot topics from the construction world, tips & tricks of the SCIA support team and other news about our products and activities. We would already like to thank you for the many entries we received for the SCIA USER CONTEST 2005. Haven't you registered yet? Than we have good news for you. You still have time until the 30th November to enter your project(s) via our website.In this edition we review the following items:  Launched projects: SCIA Phoenix & Allplan Steel DesignWater accumulation in SCIA.ESA PTThe construction market in DubaiCustomers
Projects: Kaal Mastenfabriek builds highly outstanding Radarmasts Support
Tips & Tricks: Units in SCIA.ESA PT |
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Water accumulation In the SCIA.ESA PT program a module is available for the determination of loads due to the accumulation of water. As SCIA.ESA PT works entirely in 3D, the effects of water accumulation are also entered and calculated in 3D. Working with the module Water accumulation The areas of the roof where water accumulation could occur have to be set. If more areas are defined in the same load case, than it can be taken into account that water accumulation can occur simultaneously on several spots on the roof, or that accumulation in one area has influence on accumulation in another area.
The camber, determining the height of the water, can be modelled into the construction model or separately, e.g. when the camber is incorporated in the isolation. Extra effects, e.g. the storage of water through the roof plates or extra water, possibly caused by construction faults, can be introduced. All entered data are taken into account in order to calculate the initial water height for the undeformed construction according to NEN6702 art. 8.7.1.5. The connections between the beams are also taken into account during the calculation. If the strength and rigidity of the construction is sufficient, the calculation will converge to a state of equilibrium, which eventually determines the load. This load will be shown together with the corresponding maximum bending in each iteration step. If the iteration diverges, it will be reported and the iteration stops. After the calculation, the load can still be combined with other loads and it can be checked according to a code, e.g. the NEN6770/6771.  |
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 The 'Radarmast of Zandvoort' is the most exceptional mast ever placed by Kaal Mastenfabriek. The special design was done by Zwarts & Jansma, a firm of architects. The building department of Rijkswaterstaat commisioned the job.The mast, with a height of 50 m, is situated in the middle of the dunes, next to the circuit of Zandvoort (in The Netherlands). On top is placed a slowly rotating radarantenna of 6,4 m height. In total, the mast weights 45 ton, of which 20 tons for the mast, 7,5 tons for the almost massive cast-iron spheroid segments, 7,5 tons for the stairs and 10 ton for the radar with control centre. The dimensions of the base, which is poured in reinforced concrete, are no less than 9,5m by 9,5m by 1,6m.  In order to obtain accurate measuring data of the radar installation, the rotation stability of the mast is of the highest importance. Only a small deviation in the position of the mast can cause an important inaccuracy in the registered data. To realise a mast as light as possible, but with a rotation stiffness as large as possible, a spatial construction was chosen. Such a construction gives the mast a largest possible diameter in order to get the necessary stiffness and highest possible structure transparency.  The spectacular design of the tower consists in an accumulation of octahedrons, of which the lateral surfaces are composed of irregular triangles. By making one side of the perpendicular triangle longer in the octahedron, a distortion appears in the tower. Along the longest side of the triangle, that is the edge with the weakest inclination, the staircase, which spirals around the tower, is placed. The sections of the 10 levels have each been been rotated by 72 degrees. In this way the first, the fifth and the tenth section point in the same direction. Because of the fact that each segment is rotating and because the mast tapers off the way up, the diagonals vary in length. With the complicated design it was not easy for Kaal Mastenfabriek to make the strength analysis. ESA-Prima Win was the answer to their problem. The outcome of the analysis was that the required thickness of the tubes had to be 16 mm at the bottom and declining to 5.6 mm at the top, also the weight of the spheroids at the node connections was determined.   The spheroids are made of cast iron, hollow and the heaviest ones have a weight of approx. 400 kg each. In order to absorb the forces, the spheroids at the bottom have a thickness of 80mm. Six beams of a frame construction end in a spheroid node. They are fixed to the spheroid from the inside with one M 60 bolt of 6 kg.As there was no need for welding, all components were assembled in the workshop. The mast itself has been constructed on site. |
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SCIA Group NV - Industrieweg 1007 - B-3540
Herk-de-Stad |
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Copyright © 2004 SCIA Group nv- |
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you get to the window of the units. In this window, the number of decimals can be adapted for the required results. One could e.g increase the number of decimals of the bending in order to obtain a more accurate representation of the bending.