Assessment of shear damaged and NSM CFRP retrofitted reinforced concrete beams based on modal analysis

Assessing the performance of CFRP strengthening on masonry walls using experimental modal analysis

“…Finally, the possibility of applying the developed methodology on damaged structures, different masonry materials or different masonry elements (e.g. arches, vaults) is supported by previous researches found in the literature review ( [21,24]) which used modal analysis to characterise them. In addition, experimental tests that can be generally found in literature show that the stiffness on any structure is modified when a stiffer strengthening (like FRP, which is stiffer than most of the general building materials) is applied.…”

“…In contraposition, other authors proposed using experimental modal analysis, which crosses load and acceleration data to obtain modal shapes, associated frequencies and damping values. Some applications of this technique were conducted on different structures from concrete beams [21] to rammed earth walls [22]. All concluded that modal analysis is a high-potential non-destructive technique for the structural assessment of large structures.…”

Global methodology for damage detection and localization in civil engineering structures

“…They reflect the correlation between the mode shapes of the same mode. Any diagonal value less than 1 can be interpreted as a damage indication [19].…”

Review on NSM CFRP Strengthened RC Concrete Beams in Shear

“…e prediction of the shear capacity of RC beams is a challenging task because shear mobilizes several complex resisting mechanisms such as (1) shear resistance assured by the uncracked concrete in the compression zone; (2) interface shear transfer by aggregate interlocking in the cracked concrete; and (3) the dowel action of the longitudinal reinforcement [96]. Several analytical formulations were proposed in order to predict the contribution of the NSM CFRP laminates for the shear capacity of RC beams [74,75,79,[97][98][99][100][101][102][103][104][105][106][107][108]. Some of these models were only set to predict a certain failure mode such as Rizzo and Lorenzis and c) of the RC beams shear strengthened with NSM CFP laminates [75].…”