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Earthquakes and Structures
  Volume 8, Number 5, May 2015, pages 1069-1089

Seismic response of non-structural components attached to reinforced concrete structures with different eccentricity ratios
Ayad B. Aldeka, Samir Dirar, Andrew H.C. Chan and Pedro Martinez-Vazquez

    This paper presents average numerical results of 2128 nonlinear dynamic finite element (FE) analyses of lightweight acceleration-sensitive non-structural components (NSCs) attached to the floors of one-bay three-storey reinforced concrete (RC) primary structures (P-structures) with different eccentricity ratios. The investigated parameters include the NSC to P-structure vibration period ratio, peak ground acceleration, P-structure eccentricity ratio, and NSC damping ratio. Appropriate constitutive relationships were used to model the behaviour of the RC P-structures. The NSCs were modelled as vertical cantilevers fixed at their bases with masses on the free ends and varying lengths so as to match the vibration periods of the P-structures. Full dynamic interaction was considered between the NSCs and P-structures. A set of seven natural bi-directional ground motions were used to evaluate the seismic response of the NSCs. The numerical results show that the acceleration response of the NSCs depends on the investigated parameters. The accelerations of the NSCs attached to the flexible sides of the P-structures increased with the increase in peak ground acceleration and P-structure eccentricity ratio but decreased with the increase in NSC damping ratio. Comparison between the FE results and Eurocode 8 (EC8) predictions suggests that, under tuned conditions, EC8 provisions underestimate the seismic response of the NSCs mounted on the flexible sides of the plan-irregular RC P-structures.
Key Words
    dynamic analysis; eccentricity ratio; Eurocode 8; finite element; irregular RC buildings; non-structural components; torsion
Ayad B. Aldeka, Samir Dirar, Pedro Martinez-Vazquez: School of Civil Engineering, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom

Andrew H.C. Chan: School of Science, Information Technology and Engineering (Ballarat), Federation University Australia, Victoria 3350, Australia

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