Influence of Transverse Reinforcing Bar Spacing on Flexural Crack Spacing on Reinforced Concrete

Han, Dongdong; Keuser, Manfred; Zhao, Xuemei; Langer, Beate

doi:10.1016/j.proeng.2011.07.282

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…A difference is observed in the crack intensity in early load levels (33 per cent of the collapse load), in which slab S2 showed a much severe crack rise. A change on reinforcement is a factor that can cause variation in cracking pattern (Han, 2011; Lantsoght et al , 2013; Gurutzeaga et al , 2015; Han et al , 2011).…”

Section: Resultsmentioning

confidence: 99%

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

Ferreira

Guedes

Melo

et al. 2019

IJSI

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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.

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Section: Resultsmentioning

confidence: 99%

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

Ferreira

Guedes

Melo

et al. 2019

IJSI

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“…It is noted that this phenomenon is not consistent with the cracking behavior of reinforced concrete under short-term loading. Usually, the usage of reinforcement on concrete structures is not to prevent concrete from cracking [18] but to limit the deflection and crack width [19,20]. Obviously, the effect of reinforcement on cracking behavior of concrete under long-term loading (temperature variation) is not negligible.…”

Section: Introductionmentioning

confidence: 99%

Effect of Reinforcement on Early-Age Concrete Temperature Stress: Preliminary Experimental Investigation and Analytical Simulation

Xin

Lin

Shi

et al. 2015

Advances in Materials Science and Engineering

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For concrete under short-term loading, effect of reinforcement on concrete crack resistance capability is usually negligible; however, recent research results show that extension of this viewpoint to concrete under long-term loading (temperature variation) may be unsuitable. In order to investigate this phenomenon, this paper presents the experimental and analytical results of early-age reinforced concrete temperature stress development under uniaxial restraint. The experiments were carried out on a temperature stress testing machine (TSTM). Experimental results show that the coupling of reinforcement and concrete creep behavior influenced the concrete temperature stress development, and nearly 16% of concrete stress was reduced in the current research. Moreover, the cracking time of reinforced concrete was also delayed. Finally, based on the principle of superposition, analytical simulations of effect of reinforcement on concrete temperature stress have been performed.

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Influence of Transverse Reinforcing Bar Spacing on Flexural Crack Spacing on Reinforced Concrete

Cited by 2 publications

References 6 publications

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

Effect of Reinforcement on Early-Age Concrete Temperature Stress: Preliminary Experimental Investigation and Analytical Simulation

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