Abstract
In recent years, the Lamb wave analysis by the multi-channel analysis of surface waves (MASW) for concrete structures has been an effective nondestructive evaluation, such as the condition assessment and dimension identification by the elastic wave velocities and their reflections from boundaries. This study proposes an effective Lamb wave analysis by the practical application of MASW to concrete wide beams in an easy and simple manner in order to identify the dimension and elastic wave velocity (R-wave) for the condition assessment (e.g., the estimation of elastic properties). This is done by identifying the zero-order antisymmetric (A0) and first-order symmetric (S1) modes among multimodal Lamb waves. The MASW data were collected on eight concrete wide beams and compared to the actual depth and to the pressure (P-) wave velocities collected for the same specimen. Information is extracted from multimodal Lamb wave dispersion curves to obtain the elastic stiffness parameters and the thickness of the concrete structures. Due to the simple and cost-effective procedure associated with the MASW processing technique, the characteristics of several fundamental modes in the experimental Lamb wave dispersion curves could be measured. Available reference data are in good agreement with the parameters that were determined by our analysis scheme.
Highlights
Concrete has been a popular construction material due to its economic efficiency and good durability
This study focuses on the simple Lamb wave analysis by the practical application of multi-channel analysis of surface waves (MASW), combining the IE method and the Rayleigh wave velocity measurement, which utilizes simple equipment and a facile analysis process without the separate impact-echo test
A variety of experimental data along each test line from the MASW test is presented in the dispersion curves of various Lamb wave modes
Summary
Concrete has been a popular construction material due to its economic efficiency and good durability. Concerns about concrete structures, with regard to their quality assurance (in terms of the strength, elasticity and density) and their condition assessment (in terms of dimension identification and the damage characterization of delamination, cracks and voids), are important to consider [1,2]. Stress wave-based testing techniques have the advantage of allowing one to determine certain fundamental material properties and dimensions, as well as identify flaws, in a simple and effective manner [4]. As an example of a stress wave-based. NDE, the impact-echo (IE) method, which uses multiple body wave reflections from the crack or bottom surface, has been widely applied to concrete structures in order to determine dimensions and to characterize damage. In the IE measurement, the tested structure is subjected to a transient impact
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
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 call
