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Title: Ultimate Strength Behavior Study by Regression Analysis of Beam Test Data

Author(s): Theodore C. Zsutty

Publication: Journal Proceedings

Volume: 60

Issue: 5

Appears on pages(s): 635-654


Date: 5/1/1963

Regression analysis of ultimate moment test data is used to determine median prediction equations for the modes of moment tension and moment compression failure. The coefficient of variation of test results about the predicted values is small enough to indicate that the method and the selected mathematical form are able to produce equations which accurately represent the true behavior of the test data. The equations for each failure mode are set equal to each other to determine equations for the balanced steel ratio and the balanced relative moment. The nearly constant value for the balanced relative moment agrees well with test beam behavior and is compared with present design procedure values. The equation for moment tension failure is compared graphically with present design equations, and the resulting general agreement provides additional verification of the validity of the equations derived by both methods.


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