Accuracy of "short-cut" methods in analysis of a statically indeterminate building frame

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1957

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Abstract

Data presented in this thesis prove that several of the frequently used short-cut methods of analyzing statically indeterminate structural frames for both vertical and horizontal loads are not sufficiently accurate for design purposes. These methods are discussed and their inaccuracies pointed out. In addition, a modification to the American Concrete Institute's Far-Ends-Fixed method for vertical loads is presented. This modified method is more accurate than any of the other short-cut methods investigated. Five short-cut methods of analyzing frames for vertical loads are discussed and compared with the Slope-Deflection method which was considered, to be exact. The accuracy of all methods was found, to be unsatisfactory for design purposes. However, a modification of the American Concrete Institute's Far-Ends-Fixed method as presented in Chapter TV provides accuracy satisfactory for design purposes. Three short-cut methods of analyzing frames for horizontal loads are compared with the Slope-Deflection method which was considered to be exact. The American Concrete Institute's Far-Ends-Fixed method was found to be the most accurate of the short-cut methods investigated with accuracy acceptable for design purposes. The Portal method was found to be unsatisfactory for design purposes but satisfactory for rough checks. The Cantilever method was found to be completely unsatisfactory for analyzing frames similar to the one used in the investigation.

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