Cost of Long-Span Concrete Shell Roofs
Charles S. Whitney
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Reinforced concrete arched shell construction is compared with other types. It is pointed out that when the use of timber, structural steel or concrete is reasonable appropriate, assuming equal skill in design and the same design requirements, the first cost of buildings with long span roofs is ordinarily not greatly affected by the choice of material. This is espically true in the case of buildings in which thestructural cost may amount to only about one-thrid of the total. However, this is not necessary true of the annual cost of the project because that is greatly modified by the length of life, and cost of maitenance, repairs, operation and insurance, which are different for the different materials. These latter cost items are difficult for the advance, but, insofar as possible, cost comparisions should be made on an annual basis rather than initial cost.