Material Model Incorporating Buckling of Reinforcing Bars in RC Columns

作者：Zong Zhiyu; Kunnath Sashi^*; Monti Giorgio

来源：Journal of Structural Engineering, 2014, 140(1): 04013032.

DOI：10.1061/(ASCE)ST.1943-541X.0000808

• Buckling
• Concrete columns
• Constitutive models
• Nonlinear analysis
• Reinforcement
• Concrete and masonry structures

An efficient material model was developed for reinforcing steel in reinforced concrete ( RC) columns that implicitly incorporates the degrading effects of bar-buckling. Utilizing the beam-on-springs model developed by the writers to characterize a buckling bar in a RC column, a comprehensive parametric study was performed to identify the effects of several important column parameters on the buckling behavior of the longitudinal reinforcement in RC columns. Features of average stress-strain curves of compressively loaded reinforcing bars are summarized. Constitutive relations as functions of critical column parameters were developed for direct use in fiber-section model-based nonlinear analysis of RC structures. Comparison of the numerically simulated global response of experimentally tested RC columns confirm the validity and utility of the proposed material model as a simple and effective way to include bar-buckling effects in inelastic analysis of RC frame structures.

• 出版日期2014-1