Mixed-Type Modeling of Structures with Slender and Deep Beam Elements

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Title: Mixed-Type Modeling of Structures with Slender and Deep Beam Elements

Author(s): Jian Liu, Serhan Guner, and Boyan I. Mihaylov

Publication: Structural Journal

Volume: 116

Issue: 4

Appears on pages(s): 253-264

Keywords: deep beams; macroelement; mixed-type modeling; shear; slender elements

Date: 7/1/2019

Abstract:
The nonlinear analysis of reinforced concrete frame structures with slender members can be performed accurately and efficiently with one-dimensional (1-D) elements based on the plane-sections-remain-plane hypothesis. However, if the frame also includes deep beams which require two-dimensional (2-D) high-fidelity finite element procedures, the analysis of large structures can become very costly. To address this challenge, this paper proposes a mixed-type modeling framework which integrates 1-D slender beam elements with a novel 1-D macroelement for deep beams. The framework is implemented in an existing nonlinear analysis procedure and is used to model 18 deep beam tests and a 20-story frame. It is shown that the proposed modeling framework provides similarly accurate predictions to the 2-D high-fidelity procedures but requires a fraction of the time for modeling and analysis. Furthermore, the macroelement improves the post-peak predictions, and therefore the framework is suitable for evaluating the resilience of structures under extreme loading.