Serviceability uncertainties in flat slabs

Scott, Richard

doi:10.1002/suco.201300098

Cited by 1 publication

(1 citation statement)

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“…These assumptions also apply to the strain distributions in Figure 1. However, research involving the use of strain‐gauged reinforcement 9,10 demonstrated that there is a miss‐match between strains in the steel and strains in the surrounding concrete, particularly in zones adjacent to cracks. This challenges the assumptions normally made in practical design and causes tension stiffening 11,12 where the flexural stiffness of a section varies along a beam due to the varying contribution of the concrete in tension to the stiffness of the member.…”

Section: Introductionmentioning

confidence: 99%

Shrinkage curvature of cracked reinforced concrete sections under load

Scott

Whittle

Jones

2021

Structural Concrete

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This paper describes an experimental program, which investigates the validity of using Expression 7.21 in Eurocode 2 for calculating shrinkage curvatures of loaded reinforced concrete beams cracked in flexure, this Expression having previously been validated for use with uncracked sections but not for cracked sections. The experimental method used a heating technique, which exploited the differing coefficients of expansion of limestone concrete and stainless steel reinforcement to impose simulated shrinkage strains on a range of rectangular beams of various sizes and reinforcement percentages. The results indicate that Expression 7.21 is valid for use with sections cracked in flexure but may overestimate curvatures by significant amounts. It is shown that improved estimates of curvature are given by using Expression 7.18 in conjunction with Expression 7.21 with the best results being obtained by setting β = 0.3 or by using an adjusted value for the cracking moment (Mcr), as detailed in the paper.

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Section: Introductionmentioning

confidence: 99%