Adjustable Restraining Frames for Systematic Investigation of Cracking Risk and Crack Formation in Reinforced Concrete Under Restrained Conditions

Schlicke, Dirk; Hofer, Karin; Tue, Nguyen Viet

doi:10.1007/978-3-030-39738-8_7

Cited by 15 publications

(14 citation statements)

References 10 publications

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“…As not only confirmed by these selected experimental observations but also by many others in the cited works of References 29, 30 or 31, 32, the distance between the first single cracks is often large so that new cracks may well appear between them. This is particularly important because it indicates undoubtedly that the occurrence of new cracks in the crack formation process depends strongly on both the scatter of tensile strength and on the scatter of bond behavior along the member.…”

Section: General Behavior Of Rc Members In Tensionsupporting

confidence: 74%

“…In the first part of the article, it was shown that the calculation of the maximum crack width requires an appropriate consideration of the crack stage with the related slipping length. A general calculation of the maximum crack width on basis of a crack spacing deemed to occur in the stabilized crack pattern, as proposed in References 32 or 35, leads therefore to a clear false assessment for all RC members which are in the relevant SLS condition not clearly in the stabilized crack stage with the respective stress level. Especially members with strict requirements on crack width limitation or prestressed RC members, which are usually in the single crack stage, are therefore put at the risk of underestimated maximum crack width.…”

Section: Validationmentioning

confidence: 99%

“…The local variations of steel and concrete strains in the slipping length are directly related to the distribution of bond stresses at the reinforcement‐concrete interface. Tests on the bond stresses between reinforcement and concrete indicated that the distribution of bond stresses ( τ s ( x )) along a deformed bar in concrete can be described for static loading in the SLS by a function of the slip, as given in References 23 or 32. It reads in the general form:

τ_{s} ((), x) = C s^{α} ((), x)

with C = factor depending on steel surface and compressive concrete strength, s ( x ) = slip along the deformed bar and α = factor depending on steel surface and bond quality; for conventional reinforcement C = 0.31 f c,cube and α = 0.3 with f c,cube = cube compressive strength of the concrete.…”

Section: General Behavior Of Rc Members In Tensionmentioning

confidence: 99%

“…The proposed solution was validated by comparison of computational results with experimental observations from the literature, in particular from References 6, 7, 10, 17, 19, 29‐32, 44‐49. In contrast to the usual approach of assessing selected studies, the herewith aimed validation was made upon a rather broad database containing results of different studies with different conditions.…”

Section: Validationmentioning

confidence: 99%

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Calculation of maximum crack width for practical design of reinforced concrete

Schlicke

Dorfmann

Fehling

et al. 2021

Civil Engineering Design

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Cracks are an essential characteristic of reinforced concrete (RC) construction. Serviceability and durability, however, require a reasonable limitation of the maximum crack width. The prediction of the maximum crack width of RC, however, is not trivial and has been much debated over the past decades. This article starts with a fundamental comparison of basic procedures for determining the crack width, namely using a mechanical or calibrated model. Following, the behavior of reinforced concrete during crack formation is thoroughly discussed with a focus on the bond stress‐slip relation at the reinforcement‐concrete interface and with regard to the particular crack stage. Based on these fundamentals, a mechanical calculation model is then proposed for practical calculation of maximum crack width in RC members. The suitability of the proposed model is demonstrated by the comparison of predicted and experimentally obtained maximum crack widths for a database including 460 crack width measurements. It is shown that the current state of knowledge enables a mechanically plausible calculation of the maximum crack width. Although the formulation based on the bond law is not trivial, the calculation model can be prepared with appropriate simplifications in a practical way.

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Section: General Behavior Of Rc Members In Tensionsupporting

confidence: 74%

Section: Validationmentioning

confidence: 99%

τ_{s} ((), x) = C s^{α} ((), x)

Section: General Behavior Of Rc Members In Tensionmentioning

confidence: 99%

Section: Validationmentioning

confidence: 99%

See 2 more Smart Citations

Calculation of maximum crack width for practical design of reinforced concrete

Schlicke

Dorfmann

Fehling

et al. 2021

Civil Engineering Design

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“…The measuring system involves temperature sensors, LVDTs, DD1s and strain gauges. The set‐up is illustrated in Figure 12 whilst further details on this specific set‐up will be given in Schlicke et al 151 Overall, it can be concluded that this set‐up provides important information on the interplay of hardening‐induced stressing with restraint stressing during service life with special regard to crack width development in time.…”

Section: State Of the Art Review Of Longitudinal Testing Devicesmentioning

confidence: 99%

Longitudinal restraining devices for the evaluation of structural behaviour of cement‐based materials: The past, present and prospective trends

Kanavaris

Azenha

Schlicke

et al. 2020

Strain

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The problem of thermal and shrinkage cracking in concrete has been long recognised by researchers and engineers as it can jeopardise the intended serviceability of a concrete structure. This has led researchers to develop testing devices which aim to simulate the behaviour of concrete under restrained deformations. Such devices are discerned in passive and active, depending on how concrete's movement is restrained, whilst a new type of devices has been developed to account for the combined effects of intrinsic restrained deformations and externally imposed actions. This paper presents a detailed and critical literature review on the developed restraining devices and an analysis of the capabilities, complexities and peculiarities associated with their use. Further to this, the challenges the developers of testing devices are faced with, the gaps and uncertainties with the methods found in the literature and recommendations for potential improvements in the field are discussed. K E Y W O R D Screep and shrinkage, heat of hydration, restraining devices, restraint, shrinkage cracking, thermal cracking, viscoelasticity

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