Title:
On the Ultrasonic Pulse Propagation into Fire Damaged Concrete
Author(s):
Andrea Benedetti
Publication:
Structural Journal
Volume:
95
Issue:
3
Appears on pages(s):
259-271
Keywords:
fire damage; frozen modulus hypothesis; identification techniques; reinforced concrete; residual elastic modulus; ultrasonic pulse propagation; ultrasonic tests
DOI:
10.14359/544
Date:
5/1/1998
Abstract:
In what follows we present a new identification technique capable to reconstruct the residual elastic modulus distribution in a fire damaged concrete section, starting from few travelling times measured in a side ultrasonic testing of that section. More precisely, making use of a variational setting of the problem, an analytical form of the travelling time has been established, for the case of material with linear property variation; owing to the particular form of the moduli distribution outlined by experimental analyses, a solution for the travelling time in a medium with bilinear modulus variation is set up in an approximate form. The examination of several data pertaining to a large experimental program completed in the past allowed to demonstrate the effectiveness of the proposed method for comparing identified modulus distributions with data obtained through other experimental techniques.