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This excess capacity was budgeted at 80% of the original load-carrying capacity, which confirmed to provide the potential that is needed to carry the additional loads during the next building phase. That is why new and lower spring stiffnesses needed to be calculated iteratively (taking into account the possible deformations and settlements of the foundations), before assessing the extra load-carrying capacity that becomes available in the supporting structure after the tilting pins have been unlocked. In addition to unloading the supporting structure, unlocking the tilting pins also reduces its stiffness. Oo evaluate the impact of unlocking the tilting pins, the effect of a 7mm settlement of the elastic foundation was calculated in a first step. Analyzing what happens when the tilting pins are unlocked, 28 days after the bottom girder’s concrete has been cast and just before work on the top girder is started, proved to be far more challenging. For this analysis of reaction forces, a sufficiently low E-modulus was used to account for the properties of the freshly cast concrete. In a first step, the Diamonds analysis model was used to calculate the maximum reaction forces in the supporting structure during the casting of the bottom girder. As a result, the inner tube of the support system automatically drops 7 millimeters relative to the outer tube, thereby reducing the load on the supporting structure and making extra load-carrying capacity available. The POLY support elements have a tilting pin that can be unlocked thanks to a simple tap of the hammer. The POLY support system’s possibilities to quickly and easily dismantle the bridge formwork proved to be a crucial element of this approach. Stubeco was called in to research creative building methods that eliminate the need to further strengthen the design due to additional requirements during the building process."Ī solution was developed to increase the load bearing capacity by exploiting the interaction between the 23-meter-high support structure and those elements of the bridge structure that can already bear structural loads during the building phase.
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"To realize a bridge that is as light as possible and yet provides sufficient strength, the structure was designed as an ensemble of two box girders that jointly ensure the required load-bearing capacity. "Look at the bridge structure that supports the diamond-shaped volume, and that integrates this volume with the renovated fire station below," says Tom Molkens. But whereas the result is very striking, there are also many fascinating things to tell about the building process itself - in particular about the role and the importance of creative structural design analysis. The Antwerp Port House, designed by Zaha Hadid Architects and realized by Interbuild, is a building of an entirely different scale.