Nonlinear finite element modelling and analysis of a novel self-centring steel structure under cyclic lateral loading

Jiang, Yadong, Salawdeh, Suhaib, O'Reilly, Gerard J., Alwahsh, Hatim, & Goggins, Jamie. (2022). Nonlinear finite element modelling and analysis of a novel self-centring steel structure under cyclic lateral loading. Paper presented at the Civil Engineering Research in Ireland (CERI 2022), Dublin, 25-26 August.

Abstract

After a major earthquake event, it can be problematic for building retrofitting due to the residual deformations developed under seismic excitation. To minimise this structure deformation after seismic events, a novel self-centring concentrically braced frame (SC-CBF) is developed by combining the advantages of conventional concentrically braced frames (CBFs) and self-centring structures. The self-centring behaviour of the SC-CBF is achieved by employing a horizontal posttensioning (PT) system. Under seismic excitation, the PT system can prevent the beams and columns from developing plastic hinges at connections. This ensures the concentrically braced members are the only energy-dissipation components of the frame. At the end of an earthquake event, the PT system can position the structure back to straight. Hence, the residual deformation is eliminated. This research focuses on developing a finite element model for predicting the seismic behaviour of an SC-CBF. To capture the rocking mechanism, the beam-column connection is modelled as a combination of multipoint constraint elements. Shell elements are utilised to model the brace to capture the plastic deformation during energy dissipation. Considering the other members, namely the beams and columns, remain elastic under loading, they are modelled as 2D beam-column elements. The accuracy of the proposed finite element model is validated against experimental test data. The elastic stiffness and the flag-shaped hysteresis loops are captured by the finite element model, demonstrating the feasibility of using the finite element model for further analysis of the SC-CBF.

Funder

Seismology and Earthquake Engineering Research Infrastructure Alliance for Europe
Marine Institute
Science Foundation Ireland

Publisher

Civil Engineering Research Association of Ireland

Rights

Attribution-NonCommercial-NoDerivatives 4.0 International

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Collections

Civil Engineering (Conference Papers)