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non-linear numerical modelling 1

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punching 1

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Nonlinear numerical simulation of punching shear behavior of reinforced concrete flat slabs with shear-heads

Dan V. BOMPA, Ahmed Y. ELGHAZOULI

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 2,   Pages 331-356 doi: 10.1007/s11709-019-0596-5

Abstract: This paper examines the structural response of reinforced concrete flat slabs, provided with fully-embedded shear-heads, through detailed three-dimensional nonlinear numerical simulations and parametric assessments using concrete damage plasticity models. Validations of the adopted nonlinear finite element procedures are carried out against experimental results from three test series. After gaining confidence in the ability of the numerical models to predict closely the full inelastic response and failure modes, numerical investigations are carried out in order to examine the influence of key material and geometric parameters. The results of these numerical assessments enable the identification of three modes of failure as a function of the interaction between the shear-head and surrounding concrete. Based on the findings, coupled with results from previous studies, analytical models are proposed for predicting the rotational response as well as the ultimate strength of such slab systems. Practical recommendations are also provided for the design of shear-heads in RC slabs, including the embedment length and section size. The analytical expressions proposed in this paper, based on a wide-ranging parametric assessment, are shown to offer a more reliable design approach in comparison with existing methods for all types of shear-heads, and are suitable for direct practical application.

Keywords： non-linear numerical modelling     concrete damage plasticity     RC flat slabs     shear-heads     punching shear    

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Punching of reinforced concrete slab without shear reinforcement: Standard models and new proposal

Luisa PANI, Flavio STOCHINO

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 5,   Pages 1196-1214 doi: 10.1007/s11709-020-0662-z

Abstract: Their structural behavior is not straightforward and, specifically, punching shear strength is a currentIn this study an experimental database of 113 RC slabs without shear reinforcement under punching loadsA sensitivity analysis of the parameters involved in the punching shear strength assessment was conductedwhich highlighted the importance of the flexural reinforcement that are not typically considered for punchingAfter a discussion of the current international standards, a new proposed model for punching shear strength

Keywords： punching shear strength     reinforced concrete     slabs     reinforcement ratio    

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Punching shear behavior of recycled aggregate concrete slabs with and without steel fibres

Jianzhuang XIAO, Wan WANG, Zhengjiu ZHOU, Mathews M. TAWANA

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 3,   Pages 725-740 doi: 10.1007/s11709-018-0510-6

Abstract: A study on the punching shear behavior of 8 slabs with recycled aggregate concrete (RAC) was carriedThe failure pattern, load-displacement curves, energy consumption and the punching shear capacity ofIt was concluded that the punching shear capacity, ductility and energy consumption decreased with thefailure pattern to bending-punching failure pattern.On the basis of the test, the punching shear capacity formula of RAC slabs with and without steel fibres

Keywords： recycled aggregate concrete     steel fibres     slab     punching shear     recycled coarse aggregates replacement percentage    

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A preliminary analysis and discussion of the condominium building collapse in surfside, Florida, US, June 24, 2021

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 5,   Pages 1097-1110 doi: 10.1007/s11709-021-0766-0

Abstract: Punching shear and post-punching performances of typical slab-column joints are also studied throughbuilding and the requirements of the current Chinese code are discussed, together with a comparison of the punchingshear and post-punching performances.

Keywords： progressive collapse     flat plate     simulation     punching    

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Influence of loading ratio on flat slab connections at elevated temperature: A numerical study

Rwayda Kh. S. AL-HAMD, Martin GILLIE, Safaa Adnan MOHAMAD, Lee S. CUNNINGHAM

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3,   Pages 664-674 doi: 10.1007/s11709-020-0620-9

Abstract: For reinforced concrete members subjected to high temperature, the degree of in-service loading, commonly expressed as the loading ratio, can be highly influential on the structural behavior. In particular, the loading ratio may be pivotal in relation to the phenomenon of load-induced thermal strain. Despite its potentially pivotal role, to date, the influence of the loading ratio on both material and structural behavior has not been explored in detail. In practice, real structures experience variation in imposed loading during their service life and it is important to understand the likely response at elevated temperatures across the loading envelope. In this paper, the effect of the loading ratio is numerically investigated at both material and structural level using a validated finite element model. The model incorporates a proposed constitutive model accounting for load-induced thermal strain and this is shown to outperform the existing Eurocode 2 model in terms of accuracy. Using the validated model, the specific case of flats slabs and the associated connections to supporting columns at various loading ratios are explored. For the cases examined, a marked difference in the structural behavior including displacement direction was captured from low to high loading ratios consistent with experimental observations.

Keywords： concrete     finite elements     fire     load-induced thermal strain     punching shear    

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Title Author Date Type Operation

Nonlinear numerical simulation of punching shear behavior of reinforced concrete flat slabs with shear-heads

Dan V. BOMPA, Ahmed Y. ELGHAZOULI

Journal Article

Punching of reinforced concrete slab without shear reinforcement: Standard models and new proposal

Luisa PANI, Flavio STOCHINO

Journal Article

Punching shear behavior of recycled aggregate concrete slabs with and without steel fibres

Jianzhuang XIAO, Wan WANG, Zhengjiu ZHOU, Mathews M. TAWANA

Journal Article

A preliminary analysis and discussion of the condominium building collapse in surfside, Florida, US, June 24, 2021

Journal Article

Influence of loading ratio on flat slab connections at elevated temperature: A numerical study

Rwayda Kh. S. AL-HAMD, Martin GILLIE, Safaa Adnan MOHAMAD, Lee S. CUNNINGHAM

Journal Article