Experimental Investigation of the Deformability of Reinforced Concrete Slabs under Punching

Filatov, Valery; Bubnov, E. P.

doi:10.1051/matecconf/20168601007

Cited by 8 publications

(5 citation statements)

References 2 publications

(3 reference statements)

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“…This distribution leads to a reduction in the punching shear carrying capacity for slabs supported on rectangular columns compared to those supported on squared columns with a similar length of control perimeter. This was also experimentally observed by many researchers including Teng et al (2004), Filatov and Bubnov (2016) and Filatov and Bubnov (2017). Furthermore, the concrete capacity to transfer shear stresses between the slab and the column decreases in cases where slabs are supported on rectangular columns.…”

Section: Literature Reviewsupporting

confidence: 73%

Punching shear behaviour of flat slabs with different reinforcement schemes: openings and rectangularity effects

Salman¹,

Allouzi

Shatarat

2021

IJSI

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PurposeThe main goal is to investigate the effect of size and location of opening and column size on the punching shear strength. Openings are often needed in order to install mechanical and electrical services. This process takes away part of the concrete volume which is responsible for resisting the shear forces and any unbalanced moment. Furthermore, the application of rectangular columns in flat slabs is commonly used in practice as they provide lateral stiffness to the building. They are also utilised in garages and multi-storey buildings where these elongated cross-sectional columns reduce the effective span length between adjacent columns.Design/methodology/approachThis research is a numerical-based investigation that is calibrated based on a thirteen previously tested and numerically calibrated slab specimens with no openings. A parametric study is conducted in this study to consider the effect of other parameters, which are the size and location of opening and the rectangularity ratio of column in order to evaluate their effect on the punching shear capacity. A total of 156 models are developed to study these factors. Additionally, the predicted shear carrying capacity of the simulated slabs is calculated using the ACI318–19 and Eurocode (EC2-04) equation.FindingsThe presence of openings reduced the punching shear capacity. The small opening's location and orientation have almost no effect except for one slab. For slabs of large openings, the presence of openings reduced the punching capacity. The punching capacity is higher when the openings are farther from the column. The numerically obtained results of slabs with rectangular columns show lower punching capacity compared to slabs of squared columns with the same length of the punching shear control perimeter. The punching capacity for all slabs is predicted by ACI318–19 and Eurocode (EC2-04) and it is found that Eurocode (EC2-04) provided a closer estimation.Originality/valueThe slabs considered for calibration were reinforced with four different punching shear reinforcement configurations, namely; ordinary closed rectangular stirrups, rectangular spiral stirrups, advanced rectangular spiral stirrups and circular spiral. Generally, there has been limited research on concrete flat slabs with openings in comparison with other subjects related to structural engineering (Guan, 2009) and no research on punching shear with openings of slabs reinforced with these reinforcement schemes. The available research focussed on the effects of openings on the flexural behaviour of reinforced concrete slabs includes Casadei et al. (2003), Banu et al. (2012) and Elsayed et al. (2009). In addition, experimental tests that examined slabs supported on rectangular columns are very limited.

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Section: Literature Reviewsupporting

confidence: 73%

Punching shear behaviour of flat slabs with different reinforcement schemes: openings and rectangularity effects

Salman¹,

Allouzi

Shatarat

2021

IJSI

View full text Add to dashboard Cite

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“…The measured concrete cube strength f cu at time of testing ranged from 29 MPa to 40 MPa as shown in Table 1. The detailed description of the construction, the geometrical sizes of specimens and their reinforcing are presented in [10]. Loading of test specimens was carried out in test frame placed underneath the reaction floor.…”

Section: Methodsmentioning

confidence: 99%

“…At each step of loading the indications of strain and dial gages, schemes of crack formation and development were registered. The test frame construction and the technique of specimen loading are presented in [10]. The specimen CMR-D in the process of testing is shown in Deflections of slab were measured by means of dial gauges as the difference in slab displacements at a given point and near the surface of the column.…”

Section: Methodsmentioning

confidence: 99%

“…This deformation peculiarity of flat reinforced concrete slabs, as test results show, can reduce their bearing capacity at punching by rectangular columns (pylons) [8][9][10]. The punching shear strength of RC flat slabs at rectangular columns can be overestimated if the non-uniform distribution of strains along the control perimeter around the column is neglected in the calculations.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Experimental investigation of stress-strain conditions in punching zone of flat slabs

Filatov

2017

MATEC Web Conf.

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Abstract.The technique and results of experimental study on the test specimens of the stress-strain condition of flat reinforced concrete slabs of a girderless framework at punching by columns of square and rectangular section are presented. The punching shear strength of slabs at rectangular columns can be lower than at square columns with a similar length of the control perimeter. The research of influence of a form of a column crosssection on the stress-strain condition of a reinforced concrete slab in a punching zone is conducted. The comparative analysis of distribution of concrete and reinforcement deformations of reinforced concrete slabs on column perimeter depending on a ratio of the sides of cross section is made. The results of the research of сracking in a zone of punching of reinforced concrete slabs are presented here. Results of the conducted research allow expanding the base of experimental data of the considered subject and promoting improvement of modern positions in the theory of power resistance of reinforced concrete. New experimental data received in the research corresponded with the earlier offered hypothesis that in a slab there is a zone of the constrained deformation located along the perimeter around the rectangular column.

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“…Since the calculation for punching shear has an empirical basis, the carrying out of experimental studies [11][12][13] is a necessary condition for the improvement of computational methods [14][15][16][17]. As the results of experimental studies show [18][19][20], the punching strength of a slab supported on a rectangular column may be less than that of punching a square column. This effect is a consequence of the non-uniform distribution of deformations along the control perimeter of the punching of a flat reinforced concrete slab supported on a rectangular column.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of punching shear strength of flat slabs supported on rectangular columns

Filatov

2018

E3S Web Conf.

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Abstract. The article presents the methodology and results of an analytical study of structural parameters influence on the value of punching force for the joint of columns and flat reinforced concrete slab. This design solution is typical for monolithic reinforced concrete girderless frames, which have a wide application in the construction of high-rise buildings. As the results of earlier studies show the punching shear strength of slabs at rectangular columns can be lower than at square columns with a similar length of the control perimeter. The influence of two structural parameters on the punching strength of the plate is investigated -the ratio of the side of the column cross-section to the effective depth of slab C/d and the ratio of the sides of the rectangular column Cmax/Cmin. According to the results of the study, graphs of reduction the control perimeter depending on the structural parameters are presented for columns square and rectangular cross-sections. Comparison of results obtained by proposed approach and MC2010 simplified method are shown, that proposed approach gives a more conservative estimate of the influence of the structural parameters. A significant influence of the considered structural parameters on punching shear strength of reinforced concrete slabs is confirmed by the results of experimental studies. The results of the study confirm the necessity of taking into account the considered structural parameters when calculating the punching shear strength of flat reinforced concrete slabs and further development of code design methods.

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Experimental Investigation of the Deformability of Reinforced Concrete Slabs under Punching

Cited by 8 publications

References 2 publications

Punching shear behaviour of flat slabs with different reinforcement schemes: openings and rectangularity effects

Punching shear behaviour of flat slabs with different reinforcement schemes: openings and rectangularity effects

Experimental investigation of stress-strain conditions in punching zone of flat slabs

Evaluation of punching shear strength of flat slabs supported on rectangular columns

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