Effects of shrinkage variation within beam depth and bending creep on flexural behavior of RC members. (15th December 2021)

• Record Type: Journal Article
• Authors: Kim, Seung-Gyu; Lee, Yong-Hak
• Is Part Of: Engineering structures. Volume 249(2021)
• Publication Date: 2021-12-15
• Subjects: Concrete -- Beam shrinkage -- Beam creep -- Age-dependent experiment -- Finite element analysis; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2021.113315
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: Effect of shrinkage variation within beam depth on bending creep was assessed. Beam shrinkage and bending creep were evaluated by existing prediction models. Age-dependent constitutive model to consider ageing and beam shrinkage was presented. Time-dependent finite element analyses were implemented on RC beams. Abstract: The effects of shrinkage variation within the beam depth and bending creep on the time-dependent flexural behavior of reinforced concrete (RC) beams were examined via two sets of experiments and numerical analyses. Each test set included four types of experiments: axial creep, beam shrinkage, bending creep, and time-dependent RC beam bending tests. The variations in beam shrinkage and bending creep strain were determined using the American Concrete Institute's shrinkage and creep prediction models, respectively. Time-dependent finite-element beam equilibrium equations were presented using an incremental form of the age-dependent constitutive equation. The mathematical creep model of the constitutive equation accounted for the aging effects of the elastic modulus and the creep development under a multi-sequential loading condition with a single creep curve. The resulting finite-element formulation captured the mechanical and non-mechanical phenomena of the aging effect of concrete at an early age, shrinkage variations within the beam depth, and bending creep. Comparisons between the age-dependent responses of the measured and predicted results of the RC beam test specimens illustrated the significant effects of shrinkage variation and bending creep on the time-dependent behaviors of RC flexural members.