Moment-Curvature Relationships of Reinforced Concrete Members Subjected to Combined Bending and Axial Force

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Title: Moment-Curvature Relationships of Reinforced Concrete Members Subjected to Combined Bending and Axial Force

Author(s): K. Sakai and Y. Kakuta

Publication: Journal Proceedings

Volume: 77

Issue: 3

Appears on pages(s): 189-194

Keywords: axial loads; bending; deformation; flexural strength; moment-curvature relationship; moments of inertia; reinforced concrete; rigidity; structural members.

Date: 5/1/1980

Abstract:
For calculating the deformation o f reinforced concrete members under working load, it is important to estimate the tensile resistance of concrete after cracking. Various methods have been developed for predicting deflections or curvatures. Among fhem, the methods that immediately give the transition of flexural rigidities of reinforced concrete members are relatively simple and convenient for practical use. However, fhe applicability of these methods to reinforced concrete members subjected to combined bending and axial force has not previously been demonstrated. In this paper, the expression for effective moment of inertia proposed by Branson is generalized to calculate moment-curvature relationships of reinforced concrete members subjected to combined bending and axial force,and a transient curve for the center of gravity in the effective section is introduced. To test fhe validity of this method, two types of experiments were carried out, and the test results were compared with the corresponding calculated results.