By Cesare Davini, Erasmo Viola
The quantity collects papers illustrating the paintings performed inside of a study undertaking on structural id and diagnostics. The papers care for difficulties taken from civil engineering functions and canopy a number of subject matters or facets during this box. the point of interest is especially addressed to dynamic identity strategies. In a box like that of inverse difficulties, the place the inability of a passable framework of basic houses may possibly hinder purposes to sensible difficulties, the booklet bargains a suite of easy case reviews the place numerical simulation and experimental measurements are mixed to get diagnostic info. It’s worthy stating a paper that particularly confines to crack detection in beams and rods and establishes a sequence of carefully proved effects which can flip beneficial in harm detection. particularly, the paper presents the reply to a lately raised query as to the minimum variety of frequency measurements wanted on the way to localise the crack.
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Additional info for Problems in Structural Identification and Diagnostics: General Aspects and Applications: MURST Project n. MM08342598 — COFIN 2000
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Yang and J. D. Yau. Vehicle-bridge interaction element for dynamic analysis. Journal of Structural Engineering, 123:1512-1518, 1997. DYNAMIC BEHAVIOUR AND MODELLING OF RC BEAMS RETROFITTED WITH CFRP SHEETS Barbara Bonfiglioli *:j: and Giovanni Pascale t+ * PhD, Research Fellow t Associated Professor + DISTART- University of Bologna, Viale Risorgimento, 2- 40136 BOLOGNA ITALY Abstract A procedure for assessing stiffness variations due to damaging and retrofitting of reinforced concrete beams is presented in this paper.
Nevertheless, these techniques can only provide a control of the application, aimed at detecting local defects or detachments, but they are not capable to evaluate the stiffness recovery 48 B. Bonfiglioli and G. Pascale and the global behaviour of the structure after the rehabilitation. Damaged areas in structures can be detected and localised by modal testing. Many researchers have given their contributions in this field as (Eilbracht, 1995, Zonta, 2000) and (Pimentel et al , 1999) . The aim of this research is to evaluate the effectiveness of modal testing for assessing the overall stiffness variations in RC beams extensively cracked and subsequently repaired with FRP sheets.
Ection at x = 7/16l versus crossing time: darnage Level 3. ection (Table 4). In general the experimental response is larger than the calculated one and, after the peak, it shows higher response than the theoretical one. This may be caused by out-of-plane oscillations of the moving disk that, in turn, can be due to rolling surface irregularities or small deviations of the rail-guide from a straight line. 37% (darnage level3 V6). ection increases 44 C. Bilello with darnage Ievel but not always with the moving disk's speed (for the experimental as well as the theoretical data); moreover, the percentages of variation in the beam response to the moving mass are larger than those induced in the beam dynamic parameters.