Advances in Structural Engineering Research

Full Session with Abstracts

337103-7 - Cyclic Shear Transfer Model for Smeared-Crack Analysis of RC Membrane Finite Elements

Friday, April 20
1:30 PM - 3:00 PM
Location: 202CD

How does this session impact and improve the Structural Engineering Profession?
This topic is of interest for both research and practice engineering communities dedicated to nonlinear finite element analysis (FEA) of reinforced concrete structures. Currently, several existing FE packages are being applied to research and industry projects for design and assessment of the structural performance. However, the theories behind are not always consistent between the different software, and therefore variations in results are usually encountered. Moreover, the analyst is oftentimes not fully aware of the model limitations, especially regarding the different constitutive models available in the literature and algorithmic aspects when it comes to numerical implementation. The present topic addresses an important issue in constitutive modeling of reinforced concrete regarding the behavior of cracks. Paradoxically, several finite element packages show very good agreement with experimental tests whose response is governed by the crack behavior, without really having an explicit constitutive model relating shear and normal stresses at the crack interface. Conclusions withdrawn from this presentation can be therefore useful also for code developers in order to improve current FEA packages.

Abstract:
A new shear transfer model suitable for finite element analysis of reinforced concrete membrane elements is presented. The formulation is based on the recent experimental and theoretical work on aggregate interlock carried out at University of Toronto. The model is further adapted for displacement-based smeared-crack finite element analysis relying on a fixed-crack assumption. Previous results showed good correlation of the model not only with shear stresses acting on the crack, but also confining stresses normal to the crack due to overriding of aggregates and reinforcement crossing the crack. These model capabilities are used to investigate the influence of crack dilatancy on the response of lightly or uniaxially reinforced members, where the principle stress directions significantly deviate from the principle strains’. The formulation was implemented into a four-node isoparametric finite element and validated against uniaxially reinforced panels and shear critical beams under cyclic loading.

Is this topic of regional, national or international interest?
The topic is of international interest.

Who is the target audience?
Target audience: i) university faculty of structural mechanics, structural engineering and earthquake engineering; ii) design professionals of structural and earthquake engineering; iii) software developers of finite element packages for structural mechanics, structural engineering and earthquake engineering.

What will the audience take away from your presentation?
- It will clarify controversial aspects regarding shear transfer of cracks in RC.
- It will therefore foster research and discussion within the academic community.
- It will be useful for research scientist and engineers developing nonlinear modeling software for structural analysis.
- It will be helpful for practicing engineers using nonlinear FE programs for assessment purposes.

Alexander Kagermanov

Post-doctoral researcher
IUSS Pavia

Dr. Kagermanov obtained his BSc and MSc in Civil Engineering from the Polytechnic University of Valencia (Spain), and his PhD in Earthquake Engineering from the Institute for Advanced Studies (IUSS) Pavia (Italy). His main interests concern nonlinear analysis of reinforced concrete structures, performance-based engineering and assessment existing structures. He is currently a post-doctoral researcher at IUSS, Pavia.

Presentation(s):

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337103-7 - Cyclic Shear Transfer Model for Smeared-Crack Analysis of RC Membrane Finite Elements



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