Interfacial Properties between Infilled Autoclaved Aerated Concrete and Ribbed Frame for Multi-Ribbed Composite Wall Structure

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Title: Interfacial Properties between Infilled Autoclaved Aerated Concrete and Ribbed Frame for Multi-Ribbed Composite Wall Structure

Author(s): Jing Sun, Kunpeng Wang, Jianwei Zhang, and An Chen

Publication: Structural Journal

Volume: 114

Issue: 05

Appears on pages(s): 1285-1297

Keywords: cohesive element; finite element analysis; interfacial properties; multi-ribbed wall structure; slant shear test

Date: 9/1/2017

Abstract:
Multi-ribbed composite wall structure (MRCS) is composed of densely distributed ribbed frames, including ribbed beams and columns and autoclaved aerated concrete (AAC) filled inside ribbed frames. This paper investigates the interfacial properties between ribbed frames and infilled AAC based on a combined experimental and finite element (FE) study. Slant shear tests were first conducted to evaluate the effect of joint angles on the interfacial strength, based on which a failure envelope of the interface was proposed. An FE model for the infilled frame under diagonal loading was then constructed. Cohesive elements were used to simulate the interface. The constitutive relations of the cohesive elements were defined based on the results from the slant shear tests. Good correlations between the experimental and FE results can be obtained. Finally, quadratic nominal stress damage initiation criterion (QUADSCRT), scalar stiffness degradation (SDEG), and element stresses are used to describe crack propagation and evaluate the interface.