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
DOI:
10.14359/51715632
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.
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