Analysis and Design of Elementary Prestressed Concrete Members


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Title: Analysis and Design of Elementary Prestressed Concrete Members

Author(s): Herman Schorer

Publication: Journal Proceedings

Volume: 43

Issue: 9

Appears on pages(s): 49-88

Keywords: none

Date: 9/1/1946

The purpose of this paper is to outline the analysis and design of elementary prestressed concrete mem- bers, such as beams, columns, ties, etc., subjected to Internal and external axial forces and bending mo- ments. The internal stresses, caused by the action of the prestress forces, are combined with the stresses due to external loads in three typical loading stages The first stage considers the stress condition result: ing from the simultaneous application of all sus- tained loads. The second stage determines the stress changes due to normal live loads based on a truly monollthlc participation of the entire concrete area The third stage assumes a cracked tension zone which’ condition introduces the derivation of ultimate stresses and clarifies the influence of the prestress action on the type of failure. The analytical expressions are simplified by convenient ratios, which essentially de- fine the sectional shape, the effective steel prestress and the concrete fiber stresses. Numerical examples serve to illustrate the various steps.