The tendon stress at failure, and consequently, the flexural strength of beams prestressed with external slipping tendons cannot be evaluated by a local analysis of the critical sections, and a nonlinear analysis of the whole beam-tendon structural system is required. In the past simplified formulas were proposed to calculate the tendon stress increment at failure. Some approaches however result in excessively high or too conservative increments of stress. In this work a new simplified method of analysis is proposed. This method reduces the analysis of externally prestressed beams from a global structure problem to an easier section problem and leads to a good approximation of the results of nonlinear finite element analysis.
Un metodo semplificato per la valutazione della capacità portante di travi in calcestruzzo armato precompresse con cavi esterni
DALL'ASTA, Andrea;ZONA, Alessandro
2007-01-01
Abstract
The tendon stress at failure, and consequently, the flexural strength of beams prestressed with external slipping tendons cannot be evaluated by a local analysis of the critical sections, and a nonlinear analysis of the whole beam-tendon structural system is required. In the past simplified formulas were proposed to calculate the tendon stress increment at failure. Some approaches however result in excessively high or too conservative increments of stress. In this work a new simplified method of analysis is proposed. This method reduces the analysis of externally prestressed beams from a global structure problem to an easier section problem and leads to a good approximation of the results of nonlinear finite element analysis.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
