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Volume :27 Issue : 2 2000      Add To Cart                                                                    Download

Design of reinforced concrete slabs and beams for minimum cost

Auther : MAHFUZ S. EL-RAYYES

Department of Civil Engineering Applied Science University, Amman 11931, Jordan. Fax: 962-6-5232899

ABSTRACT 

Complex structural framing, various floor systems, and nonstandard configurations of reinforced concrete cross-sections, which could lead to material savings, often entail higher costs of formwork. Formwork is one of the most expensive items in reinforced concrete construction. In order to determine the optimal and the most economical proportions, it is necessary to include the cost of formwork in the design procedure. This paper presents an approach intended to promote an overall economy in the design of reinforced concrete structures. The approach is described by equations developed for the purpose of helping the designers to proportion, without much effort, different types of slabs and beams so that the concrete member satisfies the strength requirements of the ACI Code while keeping its’ total cost, (i.e., costs of concrete, reinforcing steel and formwork) to a minimum. When estimating each component of the total cost, allowance has been made for the material losses and waste of the respective material encountered in the process of making and/or erection. The proposed design equations also have the advantage of directly obtaining the optimal dimensions of members without the necessity of making preliminary assumptions for their self-weight, because the bending moments appearing in the equations do not include the effect of self-weight.

For illustration and to facilitate easy handling of the procedure, worked examples are presented in Appendix A. Useful design aids in SI units prepared by the author and intended to expedite analysis and design of flexural members by the ACI strength design method are presented in Appendix B. 

Keywords: concrete; formwork; minimum cost; steel reinforcement; ultimate strength.

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