Damage identification of RC bridge decks under fatigue loading

Zanuy, Carlos; Maya-Duque, L. F.; Gallego, Juan Manuel; Fuente, Pablo de la

doi:10.3989/ic.13.087

Cited by 2 publications

(1 citation statement)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since cracking changes the structure’s stiffness, it is possible to associate the detection, localisation and quantification of damage with changes in vibratory properties, such as natural frequencies, mode shapes or damping ratios. Applications regarding this in different structures and employing different techniques can be cited (Zanuy et al , 2014; Capozucca and Magagnini, 2017; Xu et al , 2018; Cao et al , 2017). The choice of the damage evaluation technique depends on the level of information that can be extracted from data as well as on the structural behaviour after damage.…”

Section: Introductionmentioning

confidence: 99%

Damage assessment of reinforced concrete flat slabs through modal tests using impact excitation

Ferreira

Guedes

Melo

et al. 2019

IJSI

View full text Add to dashboard Cite

Purpose In reinforced concrete (RC) structures, an evidence of damage is the presence of cracking. In order to evaluate the effect of damage on cracking pattern and natural frequency in RC slabs, two of such structures with different dimensions and reinforcement ratios were tested, in which cracks were induced through application of static load, followed by modal tests using impact excitation. The paper aims to discuss this issue. Design/methodology/approach The gradient of the fundamental natural frequency along the decay, the crack opening rate and also a global damage index based on changes of the fundamental natural frequency were evaluated. Findings The behaviour of the aforementioned gradient was distinct for both slabs, increasing monotonically with the cracking level for the slab with lowest reinforcement ratio, and increasing until 33 per cent of the collapse load and then decreasing afterwards for the slab with the highest ratio. Changes of the gradient were consistent with changes of the crack opening rate. Both results of gradient changes and cracking pattern brought evidence that the balance between open (old) and breathing (new) cracks differed between the slabs, and may be responsible for such differences. Originality/value Damage assessment in RC structures using vibration tests is mostly concentrated on beams. In this work, an advance is made by investigating slabs. The lack of a unique pattern of changes of the gradient implies that its absolute value is not generally suitable for the association with the damage level. However, the impact tests can be effectively used to detect early damage on slabs using this proposed parameter.

show abstract