Effect of initial geometric imperfection modes on aseismic performance of single-layer spherical reticulated shell

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (5) : 33-38.

ZHANG Ming1,2, HOU Jiying2, ZHI Xudong3,4, LI Wenliang3,4

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Abstract

In order to obtain the most unfavorable initial geometrical imperfection distribution on the seismic response of the single-layer reticulated dome, this paper respectively study the seismic performance of different domes after applying four initial geometrical imperfection distributions. Firstly, consistent mode imperfection 1, consistent mode imperfection 2, the first buckling mode imperfection and the first vibration mode imperfection were selected referring to the related literatures, and their theory calculation formula and the method of applying them to the domes without any imperfection were then presented. Secondly, the structural deformation and the natural vibration frequencies of the domes applied the selected four initial geometrical imperfection modes were investigated by the finite element method. Finally, the elastoplastic dynamic time history analysis was carried out for a dome with span 100 m and other domes after applying the four initial geometrical imperfections under the action of seven three-dimensional seismic waves recorded in the main shock in the Tangshan earthquake, followed by investigation the influence of the four initial geometrical imperfections on the structural seismic performance and failure loads. The result shows that the most nodal displacements for the domes with rise to span ratio 1/3 applied the consistent mode imperfection 1 were larger generally, while for other domes the first buckling mode imperfection is the most unfavorable initial geometrical imperfection distribution for the most cases. This paper could provide a reference for the selection of the most unfavorable initial geometrical imperfection distribution in the dynamic time history analysis and the structure design, which considers the influence of the earthquake.

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initial geometrical imperfection distribution / single-layer reticulated dome / seismic performance / elastoplastic dynamic time history analysis / seismic response

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ZHANG Ming1,2, HOU Jiying2, ZHI Xudong3,4, LI Wenliang3,4. Effect of initial geometric imperfection modes on aseismic performance of single-layer spherical reticulated shell[J]. Journal of Vibration and Shock, 2021, 40(5): 33-38

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