Reinforced concrete deep beams with web openings

Sharp, Graham Richard (1977) Reinforced concrete deep beams with web openings. PhD thesis, University of Nottingham.

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Abstract

The design of reinforced concrete deep beams is not yet covered by the current British Code CP110: 1972. Some provisions are given in the CEB-FIP Recommendations (1970) and the AC1318-71 Building Code, and the new (1977) CIRIA design guide contains more comprehensive guidance including a number of recommendations for the design of deep beams with web openings.

This thesis is concerned with the general behaviour in shear of single-span reinforced concrete deep beams and in particular the effects of web openings on their ultimate strength and serviceability.

The test specimens comprised seventy-five lightweight and sixteen normal weight reinforced concrete deep beams with span/depth ratios ranging from one to two. The effects of a varied range of web openings on deflections, crack widths, cracking loads, failure modes, and ultimate shear strengths were studied, and the influence of web reinforcement was investigated.

The exact analysis of reinforced concrete deep beams with web openings presents formidable problems. However, the ultimate shear strengths of such beams can be predicted with reasonable accuracy using a simple structural idealization, which was derived from the results of the test programme. A simple design method is explained and design hints are given.

The procedures currently used by practising engineers for the design of deep beams are outlined and discussed, and a more detailed review of the new CIRIA guide is presented. Design examples are given to illustrate the use of the various methods.

In all the current procedures, the design assumptions regarding the anchorage requirements of the longitudinal tension reinforcement are necessarily conservative. Appendix 1 describes the details of nine tests carried out to provide information on the effects of various amounts of end anchorage on the strength and crack, control of deep beams. In Appendix 2 details are given of three tests carried out to investigate the behaviour of deep beams under repeated loading conditions.

Item Type:Thesis (PhD)
Supervisors:Coates, R.C.
Uncontrolled Keywords:Concrete beams, testing, design and construction
Faculties/Schools:UK Campuses > Faculty of Engineering > Department of Civil Engineering
ID Code:2362
Deposited By:Ms Valerie Airey
Deposited On:16 Dec 2011 13:59
Last Modified:16 Dec 2011 13:59

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