Shear Capacity of Reinforced Concrete Slabs under Concentrated Loads

Reißen, Karin; Hegger, Josef

doi:10.2749/222137912805111320

Cited by 7 publications

(6 citation statements)

References 2 publications

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“…The study was based on validated non-linear FE-simulations from experiments. Results from previous research sustain the suggested hypothesis of the relationship 𝑄 − 𝑏 [5,6,7]. In the studied experimental tests, the increase of 𝑄 went beyond the original 𝑏 of a specimen.…”

Section: Generalsupporting

confidence: 83%

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Assessment of Effective and Minimal Slab Widths for Evaluating the Shear Capacity of RC Overhang Slabs

Muñoz

Pacoste

Karoumi

2023

Nordic Concrete Research

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The effective width is a relevant parameter for the design of bridge overhang slabs under concentrated loads. Experimental tests have been used to assess expressions for its calculation. However, the load capacity increases with the width until a transition area is reached. Test specimens may have lacked enough width to reach full shear capacity, affecting thus the evaluation of the results. On the other hand, within the transition area, a threshold value has been hypothesized to match the effective width. This paper aims to provide recommendations for minimal widths that guarantee the full capacity of overhang slabs and to assess the calculation of the effective width by means of the threshold value and other formulations. The effect of the edge beam is also considered. A campaign of validated non-linear FE-simulations based on experiments on range of width-span ratios was performed. The results suggest using a width-span ratio of at least 4.0 for slabs without an edge beam and 5.3 for slabs with an edge beam for the experimental practice. The efficiency of the formulation for the effective widths is diffuse and the use of threshold value leads to unsafe predictions. Instead, linear-elastic FE-analyses are recommended for the design practice.

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Section: Generalsupporting

confidence: 83%

“…The suitability of such simplified formulae for RC overhang slabs has lately been assessed through tests [4,5,6,7,8,9]. It is common to use experiments to investigate the shear behaviour of these structures and to evaluate or to develop design equations.…”

Section: Generalmentioning

confidence: 99%

Assessment of Effective and Minimal Slab Widths for Evaluating the Shear Capacity of RC Overhang Slabs

Muñoz

Pacoste

Karoumi

2023

Nordic Concrete Research

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“…In the literature and resulting slab shear database [9], no report is made of experiments on slabs under a combination of concentrated and distributed loads, except for experiments in which a small line load representing an edge load is applied at the tip of a cantilevering deck [10,11]. Therefore, the experiments on slabs in shear under a combination of loads are designed such that the shear stress at the support due to the line load corresponds with 50% of the shear stress at failure observed in the slab strips of 0,5m wide under a concentrated load.…”

Section: Hypothesis Of Superpositionmentioning

confidence: 99%

Concrete Slabs under a Combination of Loads in Shear

Lantsoght¹,

Veen²,

Walraven³

2013

IABSE Conference, Rotterdam 2013: Assessment, Upgrading and Refurbishment of Infrastructures

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SummaryPrevious experimental research at Delft University of Technology indicated an increased shear capacity of slabs under concentrated loads as a function of decreasing distance to the adjacent line support. Expressions have been derived for this increase, including the definition of an appropriate effective width. However, it is unknown if the uniformly distributed loads on solid slab bridges, e.g. due to dead loads, that act over the full width can be combined with the effects of concentrated loads acting only over the associated effective width at the support. To study this problem, additional experiments have been carried out at Delft University of Technology, in which a combination of loads consisting of a concentrated load close to the support and a line load over the full slab width are applied. The experimental results prove that the superposition principle applies to combinations of concentrated loads and distributed loads.Keywords: slab bridges; shear; experimental research; effective width; tests; reinforced concrete; live loads; superposition IntroductionAs a result of the increased traffic loads and intensity over the past decades, the live loads prescribed by the current codes such as the recently implemented EN 1991-2:2003 [1] result in higher shear stresses at the support. These shear stresses can be higher than the shear stresses for which existing structures are designed. At the same time, the requirements for shear in reinforced concrete as prescribed by EN 1992EN -1-1:2005 are more conservative than the provisions from the former Dutch national code NEN 6720 [3]. These evolutions in the codes resulted in a number of existing bridges becoming shear-critical when assessed according to the governing codes. To better understand the behaviour of these structures in shear, an extensive research programme was started in the Netherlands. One of the aspects studied in this programme was the shear capacity of reinforced concrete slabs under concentrated loads. Most of the recent experimental research on slabs in shear studied the shear capacity of slabs under line loads [4,5]. These experiments showed that slabs under line loads in shear behave in a two-dimensional way and essentially as very wide beams. For slabs under concentrated loads, an increase in the shear capacity resulting from transverse load redistribution can be expected. This phenomenon wass studied in a first series of experiments carried out at Delft University of Technology. The results from the first series indicate an increased shear capacity in slabs under concentrated loads as compared to beams. The next step is to verify if the principle of superposition of concentrated and distributed loads is valid when an increased capacity is assumed for the concentrated loads. Slabs under concentrated loads in shearIn the first series of experiments [6], a total of 18 slabs and 12 slab strips were tested under a concentrated load near the support. The aim of the first series of experiments was to quantify the influence of transverse load ...

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“…It is interesting to note that slab B2 presented a higher shear strength than slab A4 (type‐A control slab). Some numerical studies 22 have shown a small but positive influence of the transverse reinforcement ratio on the shear strength. However, no significant influence has been observed experimentally 23–25 .…”

Section: Resultsmentioning

confidence: 99%

Experimental investigation of the shear strength of one‐way reinforced concrete (RC) slabs subjected to concentrated loads and in‐plane transverse axial tension

Fernández

Bernat

Oller

2021

Structural Concrete

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This paper presents the results of an experimental campaign carried out to investigate the effects of in-plane transverse tensile forces on the shear strength of linearly supported one-way reinforced concrete (RC) slabs without shear reinforcement subjected to concentrated loads. A total of 5 half scale slabs (1650 Â 1650 Â 120 mm), subjected simultaneously to different levels of in-plane tensile forces and a concentrated load were tested up to failure. The clear shear span to effective depth ratio a v /d was equal to 3 in all tests, to minimize the effects of the direct transmission of the load to the closest support, the so called arching action.As observed, the shear strength barely decreases with increasing values of the tensile force applied, even for values of the external force that cracked the concrete cross-section of the slabs in the direction perpendicular to the span. These observations may indicate that the shear-flexural behavior in the spanning direction is not significantly affected by the membrane forces in the transverse direction.

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Shear Capacity of Reinforced Concrete Slabs under Concentrated Loads

Cited by 7 publications

References 2 publications

Assessment of Effective and Minimal Slab Widths for Evaluating the Shear Capacity of RC Overhang Slabs

Assessment of Effective and Minimal Slab Widths for Evaluating the Shear Capacity of RC Overhang Slabs

Concrete Slabs under a Combination of Loads in Shear

Experimental investigation of the shear strength of one‐way reinforced concrete (RC) slabs subjected to concentrated loads and in‐plane transverse axial tension

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