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

Damage assessment of reinforced concrete flat slabs through modal tests using impact excitation 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/approachThe 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.FindingsThe 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/valueDamage 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Structural Integrity Emerald Publishing

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

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Publisher
Emerald Publishing
Copyright
© Emerald Publishing Limited
ISSN
1757-9864
DOI
10.1108/ijsi-08-2018-0049
Publisher site
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Abstract

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/approachThe 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.FindingsThe 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/valueDamage 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.

Journal

International Journal of Structural Integrity – Emerald Publishing

Published: Apr 3, 2019

Keywords: Damage index; Modal testing; Concrete slabs; Impact excitation; Structural health monitoring

References

  • Non-linear dynamics of a cracked cantilever beam under harmonic excitation
    Andreaus, U.; Casini, P.; Vestroni, F.
  • Cracked beam identification by numerically analyzing the nonlinear behavior of the harmonically forced response
    Andreaus, U.; Baragatti, P.
  • Considerations regarding superharmonic vibrations of a cracked beam and the variation in damping caused by the presence of the crack.
    Bovsunovsky, A.P.; Surace, C.
  • Structural damage identification using damping: a compendium of uses and features
    Cao, M.S.; Sha, G.G.; Gao, Y.F.; Ostachowicz, W.
  • Analysis of cracked RC beams under vibration
    Capozucca, R.; Magagnini, E.
  • Vibrational response of a beam with a breathing crack
    Cheng, S.M.; Swamidas, A.S.J.; Wu, X.J.; Wallace, W.
  • Vibration of a beam with a breathing crack
    Chondros, T.G.; Dimarogonas, A.D.; Yao, J.
  • Modal curvature and modal flexibility methods for honeycomb damage identification in reinforced concrete beams
    Dawari, V.B.; Vesmawala, G.R.
  • Vibration-based damage identification methods: a review and comparative study
    Fan, W.; Quiao, P.
  • Influence of the longitudinal reinforcement on the shear strength of one-way concrete slabs
    Gurutzeaga, M.; Oller, E.; Ribas, C.; Cladera, A.; Marí, A.
  • Modelling the degradation of vibration characteristics of reinforced concrete beams due to flexural damage
    Hamad, W.I.; Owen, J.S.; Hussein, M.F.M.
  • Experimental and theoretical investigation of the crack behavior of RC-slabs subjected to biaxial bending
    Han, D.
  • Influence of transverse reinforcing bar spacing on flexural crack spacing on reinforced concrete
    Han, D.; Keuser, M.; Zhao, X.; Langer, B.
  • Shear in one-way slabs under concentrated load close to support
    Lantsoght, E.O.L.; Veen, C.; Walraven, J.C.
  • Identification and quantification of cracks in concrete by optical fluorescent microscopy
    Litorowicz, A.
  • Comparison of linear and nonlinear static and dynamic behaviour of prestressed and non-prestressed concrete slab elements
    Mahowald, J.; Bungard, V.; Maas, S.; Waldmann, D.; Zuerbes, A.; De Roeck, G.
  • Nonlinear vibration characteristics of damaged concrete beams
    Neild, S.A.; Williams, M.S.; McFadden, P.D.
  • Comparison studies of open and breathing crack detections of a beam-like bridge subjected to a moving vehicle
    Nguyen, K.V.
  • Experimental and finite element dynamic analysis of incrementally loaded reinforced concrete structures
    Pesic, N.; Zivanovic, S.; Dennis, J.; Hargreaves, J.
  • Damage detection assessment in reinforced concrete slabs using impact tests
    Pimentel, R.; Guedes, T.; Melo, L.; Ferreira, G.; Gonçalves, M.
  • A local flexibility method for vibration-based damage localization and quantification
    Reynders, E.; De Roeck, G.
  • Mode shape-based damage detection in plate structure without baseline data
    Rucevskis, S.; Janeliukstis, R.; Akishin, P.; Chate, A.
  • Evaluation of seismic damage indices for reinforced concrete structures
    Rodríguez-Gómez, S.; Cakmak, A.S.
  • Assessment of fire-damaged concrete using crack density measurements
    Short, N.R.; Purkiss, J.A.; Guise, S.E.
  • Internal cracking and transport properties in damaged concretes
    Torrijos, M.C.; Giaccio, G.; Zerbino, R.
  • Damage detection of RC beams based on experiment and analysis of nonlinear dynamic characteristics
    Wang, L.; Zhou, X.; Liu, H.; Yan, W.
  • Modeling the dynamic stiffness of cracked reinforced concrete beams under low-amplitude vibration loads
    Xu, T.; Castel, A.
  • Influence of steel–concrete bond damage on the dynamic stiffness of cracked reinforced concrete beams
    Xu, T.; Huang, J.; Castel, A.; Zhao, R.; Yang, C.
  • Experimental and numerical study on the dynamic response of RC slabs under blast loading
    Yao, S.; Zhang, D.; Chen, X.; Lu, F.; Wang, W.
  • Damage identification of RC bridge decks under fatigue loading
    Zanuy, C.; Maya-Duque, L.F.; Gallego, J.M.; de la Fuente, P.
  • Nonlinear characteristics of damaged reinforced concrete beam from Hilbert-Huang transform
    Zhu, X.Q.; Law, S.S.