QPH Shell elements

[khodaie]

Hello all,

QPH shell elements are used to define beam elements as rebars in reinforced concrete. Does anyone knows the formulation and how it uses the cross section module of the rebars in the calculations?

Thanks,

Sina Khodaie, MS

Graduate Research Assistant
Dept. of Civil and Environmental Engineering
University of South Carolina

300 Main Street, Room B127
Columbia, SC 29208
Tel: +1 (803) 238-0849
khodaie@email.sc.edu
www.ce.sc.edu

[ES3]

Rebars are modeled by beam elements, not shell elements.

In the manual, there are pre-defined cross sections for beam elements. Also you can create a user-defined cross section, which requires some programming in c++ using the user interface described in the manual.

[khodaie]

Oh alright. It is stated in the MARS manual version March 12 2014, page 74, that the formulation of the Rebars are similar to QPH shell elements.
I appreciate if you explain what beam theory was used in the finite element simulation of the beam elements and provide the formulation for it.

Thanks,
Sina Khodaie

[giacusatis]

Sina, the formulation is basically Tymoshenko's. For slender beams you do get classical Bernoulli's behavior. We have verified it. Be careful, however, with the gauss point used for the integration over the cross section. The default ones are not enough for accurate bending behavior especially if plasticity occurs.