The current provisions for fire rating of reinforced concrete slab as per Indian Standard code IS456 (2000) are based on minimum width and cover to reinforcement. The influence of various parameters is not accounted in the code provisions. This paper presents a three-dimensional nonlinear finite element analysis for evaluating the fire response of reinforced concrete slabs using the FE model. The numerical analysis results are not conservative with the specified fire rating provided in IS456 (2000) and Eurocode 2 (2004). Several two-way slabs are modeled to quantify the effect of various parameters and their influence on fire rating based on different failure criteria. The analyses show that the parameters considered in the present study have significant influence on the fire rating. The fire rating of slabs with various end restraints specified in IS456 (2000) for design calculation at ambient temperature is also evaluated. Ó 2016 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

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Generally structural members can be broadly divided into two regions, namely B or Bernoulli regions where the strain distributions are linear and D or Disturbed regions where the strain distributions are nonlinear. A beam whose depth is comparable to span is known as deep beam and these structural elements belong to D regions. It has been recently understood that the strut and tie method (STM) is an effective tool for the design of both B and D regions. The present code recommendations are inadequate for the design of deep beams. In this paper simple equations using STM are developed for finding the area of main steel required to have a balanced type of failure and to find the ultimate capacity of deep beams failing in different failure modes. These equations are compared with experimental results and a good agreement is found.

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