Title: Analytical Model for Rotation Response of Singly Reinforced Flexural Members

Author(s): Binbin Zhou, Ruo-Yang Wu, and Jian Feng

Publication: Structural Journal

Volume: 115

Issue: 3

Appears on pages(s): 789-799

Keywords: bond stress; linear softening model; pre- and post-yield; rotation capacity; singly reinforced flexural members; strain localization; tension chord model

DOI: 10.14359/51702044

Date: 5/1/2018

Abstract:
Rotation of a reinforced concrete (RC) flexural member can be evaluated as the systematic combination of deformation from tension zone and compression zone. Contribution of deformation in tension zone or compression zone to the rotation is not constant and depends on the mechanical reinforcement ratio and the failure pattern of RC flexural members. A general analytical model to predict the rotation response of singly reinforced flexural members is presented in this paper. In the proposed model, the Tension Chord Model (TCM), representing the tension stiffening effect in tension zone, and the Linear Softening Model (LSM), describing the softening response of concrete in compression zone, are assembled to predict the advanced moment-curvature relationship. The evaluation procedures are divided into two cases based on whether the strain localization has been caused at failure. Finally, the numerical simulations implemented by the proposed model show a good agreement with the results of three-point bending tests.