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Computers and Concrete
  Volume 22, Number 3, September 2018, pages 269-278

Partial sectional confinement in a quasi-encased steel-concrete composite beam
Amir Masoud Hassanzadeh and Mehdi Dehestani

    In the recent decades, the application of composite materials, due to their desirable properties, has increased dramatically. In the present study, a quasi-encased trapezoidal section composite steel beam encased with concrete is thoroughly examined. Calculation of the load bearing capacity is carried out by finite element modeling of concrete and FRP beams with trapezoidal section under the effect of controlled displacement loading. The results are then validated comparing to the existing experimental results obtained from similar studies. Further on, the materials are changed to steel and concrete, and the section is de-signed in such a way that both concrete and steel reach a high percent-age of their load bearing capacity. In the last step, the parameters affecting the bending capacity and the behavior of the semi-confined composite beam are investigated. Results revealed that the beam diagonal web thickness plays the most effective role in load bearing capacity amongst other studied parameters. Furthermore, by analyzing the results on the effect of different parameters, an optimal model for primary beam section is presented, which exhibits a greater load bearing capacity compared to the initial design with the same amount of materials used for both sections.
Key Words
    composite structures; partial confinement; finite element method; boundary conditions
Amir Masoud Hassanzadeh and Mehdi Dehestani: Faculty of Civil Engineering, Babol Noshirvani University of Technology, Babol, Iran

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