Abstract
The use of modal tests for detecting damage in reinforced concrete precast slabs is evaluated. A set of eight slabs were tested, each belonging to flats constructed for residential use. Two groups of slabs were identified and, in each group, both cracked and uncracked slabs were found. This made it possible to compare the responses of the slabs when subjected to modal tests. The tests were carried out employing an instrumented hammer and heel drops as excitation sources. Responses were measured using an accelerometer. The lowest natural frequencies of the slabs could be identified and after filtering the results, plots indicating the variation of the lowest natural frequency versus the number of cycles of free decay were obtained for each slab. Such a plot is of more general use than the value of the natural frequency by itself, as it does not depend on slab configuration. It was observed that the cracked slabs presented a similar pattern of variation of the natural frequencies throughout the decay, being distinctive from the pattern observed for their uncracked counterparts. This provided evidence that a quick assessment of the structural condition of such slabs through the use of the tests were feasible.
Highlights
Structural integrity assessment is a topic of major importance in civil structures
Use of modal testing can be considered a useful alternative to provide at least a qualitative assessment of the structural condition
Two groups of four concrete precast slabs with cracks were investigated by means of modal tests, aiming to analyse the applicability of such tests in damage detection
Summary
Structural integrity assessment is a topic of major importance in civil structures. Cracking is a condition that raises a flag regarding the integrity of a structural system, being a possible sign of reduction of structural strength. Visual inspection can be conducted to identify its presence. This is not efficient since one cannot properly assess the structural condition, and access to visual inspection may be impaired. Use of modal testing can be considered a useful alternative to provide at least a qualitative assessment of the structural condition. In this context, a series of previous works related to this application can be found
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
