ETD system

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Tesi etd-11202011-115602


Thesis type
Tesi di laurea specialistica
Author
PIETRINI, DIANORA
URN
etd-11202011-115602
Title
Progetto del varo di un ponte in sezione mista
Struttura
INGEGNERIA
Corso di studi
INGEGNERIA DELLE COSTRUZIONI CIVILI
Supervisors
relatore Prof. Croce, Pietro
relatore Prof. Lucchesi, Daniele
Parole chiave
  • launching nose
  • composite bridges
  • RTM method
  • nose-deck interaction
  • linear buckling analysis
  • patch loading
  • incremental launching
  • erection techniques
  • steel tub girder bridges
Data inizio appello
12/12/2011;
Consultabilità
Parziale
Data di rilascio
12/12/2051
Riassunto analitico
This thesis deals with the erection project of a composite girder bridge, by means of the incremental launching technique. After a detailed description of the main erection techniques regarding girder bridges (prestressed concrete, steel and composite bridges), the attention is focused on incremental launching, describing the most typical features and problems of this construction method, especially for composite bridges. Afterwards, a practical example is analysed, concerning a 310m-long steel tub girder bridge, with a varying depth concrete slab, incrementally launched from one abutment towards the opposite one (consisting in the construction of deck segments behind the abutment alternating with the launch of the whole deck section), using a steel trussed launching nose. The optimization of the nose-deck interaction is carried out, and the calculation of stresses in the superstructure during launching is performed by means of a special spreadsheet developed for this purpose, based on the reduced transfer matrix method. Finally, strength and stability verifications of the superstructure are accomplished, using a linear buckling FEM analysis, and the patch loading problem is described and discussed.
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