The stability of HPC beams prestressed by slipping cables is studied. Both the prestressing techniques of unbonded internal cables and external cables are considered. A brief recall of the mathematical formulation of the problem is reported in the first section. In the second section, results of some numerical applications are shown. With reference to the external prestressing, the importance of the number of saddle points to increase the safe prestressing level of the beam is shown. Finally, when prestressing in performed by unbonded internal cables, the different behaviour of beams having the same loading capacity, obtained by modifying the cross section geometry according to the different concrete strength, is shown.
Stabilità di travi in HPC presollecitate con cavi scorrevoli
DALL'ASTA, Andrea;LEONI, Graziano
2000-01-01
Abstract
The stability of HPC beams prestressed by slipping cables is studied. Both the prestressing techniques of unbonded internal cables and external cables are considered. A brief recall of the mathematical formulation of the problem is reported in the first section. In the second section, results of some numerical applications are shown. With reference to the external prestressing, the importance of the number of saddle points to increase the safe prestressing level of the beam is shown. Finally, when prestressing in performed by unbonded internal cables, the different behaviour of beams having the same loading capacity, obtained by modifying the cross section geometry according to the different concrete strength, is shown.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
