Damage Assessment of RC Flat Slabs Partially Collapsed Due to Punching Shear

The aim of this study is to determine the causes of brittle collapse of existing reinforced concrete (RC) flat slab supported by columns under vertical loading. This paper focuses on the assessment of RC flat slab structures from the point of punching shear resistance. The entire process is illustrated using a case study from a parking structure. In the examined structure, the second storey slab was collapsed to the first storey slab without any earthquake and impact effects. A partially collapsed RC flat slab structure is examined within the scope of a field survey, lab studies, and numerical analyses. The first stage of the study examines the existing state of the collapsed structure and its compliance with architectural and structural drawings. Second, mechanical tests are conducted on samples gathered from the structure, based on observational research and lab environment. At the final stage, the structure’s three-dimensional finite element model is prepared and the causes of the collapse of the structure are determined. The analysis shows that the lack of shear reinforcement, unforeseen loadings, and design errors are remarkably harmful to the slab–column connection resulting in punching shear resistance.

[1]  Lionello BortolottiI.  Punching Shear Strength in Concrete Slabs , 1990 .

[2]  Guray Arslan,et al.  An Investigation of the Concrete Contribution to Shear Strength of RC Columns Failing in Flexure , 2016 .

[3]  Sumei Zhang,et al.  Punching shear behavior of concrete flat plate slab reinforced with carbon fiber reinforced polymer rods , 2007 .

[4]  Ashraf Mohamed Mahmoud,et al.  Finite element implementation of punching shear behaviors in shear-reinforced flat slabs , 2015 .

[5]  David Z. Yankelevsky,et al.  Punching shear in concrete slabs , 1999 .

[6]  Aurelio Muttoni,et al.  Punching shear strength of reinforced concrete slabs without transverse reinforcement , 2008 .

[7]  Iyad Alkroosh,et al.  Soft computing for modeling punching shear of reinforced concrete flat slabs , 2015 .

[8]  Hamed S. Askar.  Usage of prestressed vertical bolts for retrofitting flat slabs damaged due to punching shear , 2015 .

[9]  A. J. Al-Karawi,et al.  Synthesis, characterization and thermal properties of sodium pyruvate thiosemicarbazone and some of its metal complexes , 2012 .

[10]  Valter José da Guia Lúcio,et al.  Punching of flat slabs with in-plane forces , 2011 .

[11]  Beatrice Belletti,et al.  Evaluation of compressive membrane action effects on punching shear resistance of reinforced concrete slabs , 2015 .

[12]  H. Marzouk,et al.  Prediction of punching shear strength of two-way slabs , 2011 .

[13]  S. Kinnunen,et al.  Punching of concrete slabs without shear reinforcement , 1960 .

[14]  Thomas Keller,et al.  Effect of punching shear on load–deformation behavior of flat slabs , 2014 .

[15]  Mehrdad Sasani,et al.  Compressive membrane action in progressive collapse resistance of RC flat plates , 2014 .

[16]  M. Esfahani.  EFFECT OF CYCLIC LOADING ON PUNCHING SHEAR STRENGTH OF SLABS STRENGTHENED WITH CARBON FIBER POLYMER SHEETS , 2008 .

[17]  Angeliki Papalou.  Examining the Dynamic Response of Classical Columns , 2018 .

[18]  Cengizhan Durucan,et al.  Effect of opening size and location on the punching shear behavior of interior slab–column connections strengthened with CFRP strips , 2015 .

[19]  Alejandro Pérez Caldentey,et al.  Influence of stirrup detailing on punching shear strength of flat slabs , 2013 .

[20]  M. R. Kianoush,et al.  Punching shear strength of interior slab–column connections strengthened with carbon fiber reinforced polymer sheets , 2009 .

[21]  Ahmed Ibrahim,et al.  Effect of mid-thickness rebar mesh on the behavior and punching shear strength of interior slab–column connection , 2016 .

[22]  Johan Silfwerbrand,et al.  Punching shear capacity of RC slabs , 2002 .

[23]  Thomas Keller,et al.  Punching shear of RC flat slabs - Review of analytical models for new and strengthening of existing slabs , 2013 .

[24]  Ibrahim M. Metwally,et al.  Prediction of punching shear capacities of two-way concrete slabs reinforced with FRP bars , 2013 .

[25]  V. Lúcio,et al.  Punching behaviour of RC flat slabs under reversed horizontal cyclic loading , 2016 .

[26]  K. Soudki,et al.  Strengthening of concrete slab-column connections using CFRP strips , 2012 .

[27]  António Manuel Pinho Ramos,et al.  Punching of high strength concrete flat slabs without shear reinforcement , 2015 .

[28]  D. D. Theodorakopoulos,et al.  Ultimate punching shear strength analysis of slab–column connections , 2002 .

[29]  Aurelio Muttoni,et al.  Influence of moment redistribution and compressive membrane action on punching strength of flat slabs , 2015 .

[30]  Philippe Menétrey,et al.  Synthesis of punching failure in reinforced concrete , 2002 .

[31]  Jongsung Sim,et al.  Punching shear strength of strengthened deck panels with externally bonded plates , 2004 .

[32]  J. Wight,et al.  Flexurally-triggered punching shear failure of reinforced concrete slab–column connections reinforced with headed shear studs arranged in orthogonal and radial layouts , 2016 .