Punching of flat slabs under reversed horizontal cyclic loading

Ramos, António Manuel Pinho; Marreiros, Rui; Almeida, André; Isufi, Brisid; Inácio, Micael M.G.

doi:10.35789/fib.bull.0081.ch13

Cited by 14 publications

(18 citation statements)

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“…Such test setups have been commonly accepted and used as good and simple representatives of slab–column connections. However, they use simplified boundary conditions, such as borders that are free of bending moments and vertically fixed, which lead to a static position of the zero‐moment line and the inability to have bending moment redistribution . To overcome some of these limitations, a different test setup has been developed at Department of Civil Engineering, Faculty of Sciences and Technology, Universidade NOVA de Lisboa (DEC/FCT/UNL) .…”

Section: Experimental Campaignmentioning

confidence: 99%

“…However, they use simplified boundary conditions, such as borders that are free of bending moments and vertically fixed, which lead to a static position of the zero‐moment line and the inability to have bending moment redistribution . To overcome some of these limitations, a different test setup has been developed at Department of Civil Engineering, Faculty of Sciences and Technology, Universidade NOVA de Lisboa (DEC/FCT/UNL) . This setup allows vertical displacements at the slab borders; equal magnitude of shear forces, bending moments and rotations at the slab borders; mobility of the line of inflection location along the longitudinal direction and the possibility of applying high vertical load ratios.…”

Section: Experimental Campaignmentioning

confidence: 99%

“…The ratio V g / V 0 , known as gravity shear ratio (GSR), has been recognized as a major factor in the ultimate drift capacity of flat slab specimens with and without shear reinforcement . All specimens had approximately the same GSR around 55%, except for C‐SSR5c in which a higher GSR was applied (Table ).…”

Section: Experimental Campaignmentioning

confidence: 99%

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Reversed horizontal cyclic loading tests of flat slab specimens with studs as shear reinforcement

Isufi

Ramos

Lúcio

2018

Structural Concrete

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The results of a series of experiments on four reinforced concrete flat slab specimens with shear studs and a control specimen without any shear reinforcement are presented. The specimens were tested under constant gravity loads and reversed horizontal cyclic displacements. The main test variables were the applied gravity load and the number of perimeters of studs. One of the specimens was tested in two phases to study the postearthquake behavior. Results showed a considerable improvement of the deformation capacity of specimens with studs compared to the reference specimen. In agreement with previous research, increasing the applied gravity shear ratio resulted in a lower experimental drift capacity. It is shown that a better explanation of the observed ultimate drifts can be made by considering also the flexural capacity and the extent of shear reinforcement. The specimen tested in two phases exhibited considerable residual capacity, even after severe horizontal loading.

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Section: Experimental Campaignmentioning

confidence: 99%

Section: Experimental Campaignmentioning

confidence: 99%

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Reversed horizontal cyclic loading tests of flat slab specimens with studs as shear reinforcement

Isufi

Ramos

Lúcio

2018

Structural Concrete

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“…The differences described in the previous paragraphs are visible in Figure 6a, resulting in a wide range of ultimate drift ratios between 1.5 and 6.5% for GSR between 0.2 and 0.35. Figure 6a,b compare the results obtained in the tests described in this paper (Figure 6a) with those of the database of isolated slab‐column connections analyzed by Ramos et al, 35 figure 6b. In both sets of results, for GSR between 0.2 and 0.35 the values of ultimate drift are in the range 1.5–6%.…”

Section: Resultsmentioning

confidence: 66%

A state of the art of flat‐slab frame tests for gravity and lateral loading

Coronelli

Muttoni

Pascu

et al. 2020

Structural Concrete

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This paper presents a critical review of the state of the art of experimental research concerning the seismic response of reinforced concrete flat slab frames. After a summary of tests on connections, the paper examines tests carried out on frames with gravity and cyclic lateral loading, and shake table tests; scaled specimens and one real scale study are included. A discussion of the results reached so far is provided focusing on the global response, the different load types and effects; the ultimate rotations at failure in relation to the gravity shear and a classification of different failure modes for different types of connections. Based on this analysis, the research needs are highlighted. An experimental program launched to address these open questions is described. Further open topics are highlighted.

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“…This experimental work was developed using a test setup that models the boundary conditions of the flat slab at half spans, allowing the redistribution of bending moments and the migration of the inflection point as well as controlling the vertical movement by impose equal displacements of the supported borders to simulate the behaviour of the real slab. This test setup had already been used by the research team and proved to be efficient for what it was designed, as can be seen in (Almeida et al, 2016), (Ramos et al, 2017) and (Gouveia et al, 2017). For the detailing of the shear reinforcement, variations were made in the amount of steel reinforcement in each layer and in the number of used layers.…”

Section: Introductionmentioning

confidence: 99%

Behaviour of reinforced-concrete flat slabs with stirrups under reversed horizontal cyclic loading

Almeida

Alcobia

Ornelas

et al. 2020

Magazine of Concrete Research

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Punching of flat slabs under reversed horizontal cyclic loading

Cited by 14 publications

References 0 publications

Reversed horizontal cyclic loading tests of flat slab specimens with studs as shear reinforcement

Reversed horizontal cyclic loading tests of flat slab specimens with studs as shear reinforcement

A state of the art of flat‐slab frame tests for gravity and lateral loading

Behaviour of reinforced-concrete flat slabs with stirrups under reversed horizontal cyclic loading

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