Abstract
During last years a new constructive sequence of viaducts with movable scaffolding system (MSS) has been developed in Spain. This sequence is based on a self-supporting core that is formed by the bottom slab, webs and the cantilevers of the top slab so the MSS can advance to the next span and activities of the second casting phase can be performed out of crithical path. This current sequence has 2 related issues: the need of two prestressing stages per span and the need of long length splices between the self-supporting core and the second casting phase. The current paper studies if the number of prestressing stages per span can be reduced to only one. Two different solutions are proposed. Solution 1 consists in introducing 100% of the prestressing force at the self-supporting core. Solution 2 consists in introducing 50% of the prestressing force in a tendon that crosses two spans so when other 50% of the prestressing force is introduced at the self-supporting core, prestressing force reaches 100% at the previous span. As no viaducts have been constructed with Solution 1 and 2, Finite Element models have been carried out and suggest that Solutions 1 and 2 can be considered for construction.
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