R S Narayanan

Bio: R S Narayanan is an academic researcher. The author has contributed to research in topics: BS 8110 & Limit state design. The author has an hindex of 1, co-authored 1 publications receiving 2383 citations.

Concise eurocode for the design of concrete buildings. based on bsi publication dd env 1992-1-1: 1992. eurocode 2: design of concrete structures. part 1: general rules and rules for buildings

Abstract: This document contains only that material from Eurocode 2 (EC2) necessary for the design of everyday reinforced and prestressed concrete structures. Other material not in EC2, including bending moment coefficients for beams and slabs and design charts are included in an appendix, so that designers have all the information they would expect to find in a British code. Recommendations are given for concrete cover and durability, and designs for the ultimate limit state in bending and axial load, shear resistance, and torsion is examined. The control of cracking and deflection is discussed. The guidance on prestressed concrete design is limited to structures in normal weight concrete where prestress is by fully bonded tendons. Advice is given on the required numbers of tendons, the prestressing force and the limit states. Anchorages and anchorage zones are considered.

Punching shear strength of reinforced concrete slabs without transverse reinforcement

Abstract: A mechanical explanation of the phenomenon of punching shear in slabs without transverse reinforcement is presented on the basis of the opening of a critical shear crack. It leads to the formulation of a new failure criterion for punching shear based on the rotation of a slab. This criterion correctly describes punching shear failures observed in experimental testing, even in slabs with low reinforcement ratios. Its application requires the knowledge of the load-rotation relationship of the slab, for which a simple mechanical model is proposed. The resulting approach is shown to give better results than current design codes, with a very low coefficient of variation (COV). Parametric studies demonstrate that it correctly predicts several aspects of punching shear previously observed in testing as size effect (decreasing nominal shear strength with increasing size of the member). Accounting for the proposed failure criterion and load-rotation relationship of the slab, the punching shear strength of a flat slab is shown to depend on the span of the slab, rather than on its thickness as often proposed.