Structural Engineering and Mechanics

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A 3D co-rotational beam element for steel and RC framed structures

  • Long, Xu (School of Civil and Environmental Engineering, Nanyang Technological University) ;
  • Tan, Kang Hai (School of Civil and Environmental Engineering, Nanyang Technological University) ;
  • Lee, Chi King (School of Civil and Environmental Engineering, Nanyang Technological University)
  • Received : 2013.02.19
  • Accepted : 2013.11.01
  • Published : 2013.12.10
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Abstract

A 3-node 3D co-rotational beam element using vectorial rotational variables is employed to consider the geometric nonlinearity in 3D space. To account for shape versatility and reinforced concrete cross-sections, fibre model has been derived and conducted. Numerical integration over the cross-section is performed, considering both normal and shear stresses. In addition, the derivations associated with material nonlinearity are given in terms of elasto-plastic incremental stress-strain relationship for both steel and concrete. Steel reinforcement is treated as elasto-plastic material with Von Mises yield criterion. Compressive concrete behaviour is described by Modified Kent and Park model, while tensile stiffening effect is taken into account as well. Through several numerical examples, it is shown that the proposed 3D co-rotational beam element with fibre model can be used to simulate steel and reinforced concrete framed structures with satisfactory accuracy and efficiency.

Keywords

References

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