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Computers and Concrete
  Volume 10, Number 5, November 2012 , pages 489-505

Nonlinear modeling of flat-plate structures using grid beam elements
Ying Tian, Jianwei Chen, Aly Said and Jian Zhao

    This paper presents a simplified grid beam model for simulating the nonlinear response of reinforced concrete flat-plate structures. The beam elements are defined with nonlinear behavior for bending moment and torsion. The flexural stiffness and torsional strength of the beam elements are defined based on experimental data to implicitly account for slab two-way bending effects. A failure criterion that considers the interaction between the punching strength and slab flexural behavior is incorporated in the model. The effects of bond-slip of slab reinforcement on connection stiffness are examined. The proposed grid beam model is validated by simulating large-scale tests of slab-column connections subjected to concentric gravity loading and unbalanced moment. This study also determines the critical parameters for a hysteretic model used to simulate flat-plates subjected to cyclic lateral loading.
Key Words
    cyclic loading; flat-plate; grid model; hysteretic behavior; punching failure; slab-column connection.
Ying Tian and Aly Said: Department of Civil and Environmental Engineering and Construction, University of Nevada Las Vegas, Las Vegas, USA; Jianwei Chen: College of Civil and Architectural Engineering, Hebei United University, Tangshan, China; Jian Zhao: Department of Civil Engineering and Mechanics, University of Wisconsin-Milwaukee, Milwaukee, USA

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