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PUNCHING SHEAR STRENGTH ON TWO WAY SLAB SPECIMENS: COMPARISON USING IS AND ACI CODES G.V.V. Satyanarayana 1 , N.R. Dakshina Murthy 2 and M.V. Seshagiri Rao 3 1 Associate Professor, Department of Civil Engineering, Gokaraju Rangaraju Institute of Engineering & Technology, Hyderabad, India 500090 2 Associate Professor, Department of Civil Engineering, CBIT, Hyderabad, India 3 Professor, Department of Civil Engineering, JNTUH, Hyderabad, A.P. India Abstract The ultimate strength of reinforced concrete slabs is frequently governed by the punching shear capacity, which may be increased with addition of traditional fitments such as reinforcing steel, headed studs or shear heads. In addition to these traditional methods of strengthening against punching, steel reinforcement has proved to be an effective and viable alternative. The addition of fibres into the concrete improves not only the shear behaviour but also the deformation capacity of reinforced concrete slabs. This paper presents a detailed study on resistance against punching shear of two way slabs with Fly ash blended concrete under Punching shear loads. The two way slab specimens were subjected to punching shear loading subjected by in house fabricated arrangement. The slab specimens were cast using M30 grade concrete with HYSD bars. For making specimens M30 grade concrete mix were used. The cement was partially replaced with fly ash (FA) at different percentages i.e., 0 to 30% at regular intervals of 10%. The test results indicate that the two way slab specimens with partial replacement of cement by Fly ash exhibit more resistance against punching shear and the experimental results exhibits the punching shear. The observed experimental values were compared with ACI and IS codes. The experimental value found to be in line with the codal provisions and the specimens with fly ash replacement of cement exhibited more resistance. Keywords: Fly ash, Punching shear load, ACI, IS, FEM INTRODUCTION The cement and steel industries in India have contributed immensely to the infrastructure development all over the country. The production of cement and steel have increased to leafs and bounds. This cement production is leading to the environmental hazards on one hand and exhaust of natural raw materials on the other hand. Similarly the steel production in India is also creating environmental hazards leading to the problem of national concern. During the process of production of cement and steel, large quantities of indigenous coal were burned and leading to the production of fly ash. The disposal of fly ash again a serious problem, so in recent years, the use of blended cements, particularly the fly ash-based variety has shown a sharp increased [1, 2, 3]. N. Bouzoubba [4] was discussed the usage of fly ash in place cement and reported that the workability, durability and other properties were increased. Some researchers were studied on fly ash concrete under sulphate attack reported that the compressive strength, split tensile strength of fly ash concrete in medium grade concretes were increased over conventional concretes. N. R.
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  • Spring '17
  • anandh mishra

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