Lower bound equilibrium element and submodel for shear joints in precast concrete structures. (15th March 2017)

• Record Type: Journal Article
• Authors: Herfelt, Morten A.; Poulsen, Peter N.; Hoang, Linh C.; Jensen, Jesper F.
• Is Part Of: Engineering structures. Volume 135(2017:Mar. 15)
• Page Start: 1
• Page End: 9
• Publication Date: 2017-03-15
• Subjects: In-situ cast joints -- Limit analysis -- Precast concrete -- Finite element -- Rigid plasticity -- Yield criterion -- Multiscale; 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.2016.12.054
• Languages: English
• ISSNs: 0141-0296

Abstract

Highlights: A multiscale model for effective modelling in-situ cast joints is proposed. A semi-analytical submodel yield criterion is developed to account for local effects. Excellent agreement between the proposed model and experimental data is found. The proposed approach reduces problem size and CPU time by several magnitudes. Abstract: This paper is concerned with the shear capacity of keyed joints reinforced with overlapping U-bar loops in the transverse direction. The layout of the loop reinforcement affects the capacity and failure mode, and currently it is not accounted for by standards or previous theoretical work. A multiscale approach to the issue is proposed: An equilibrium element for finite element limit analysis representing keyed joints is coupled with a suitable submodel, which handles the complex stress states within the joint. The submodel is based on several modified stringer models, which makes it possible to account for local mechanisms in the core of the joint. The element and submodel are validated by comparison to a detailed model based on finite element limit analysis and experimental data. The joint element and submodel lead to a small optimisation problem compared to the detailed model and the computational time is reduced by several magnitudes.