Dynamic failure of a cable-stiffened single layer two-way grid dome under seismic multi-support excitations

ZHANG Zhonghao1,2,ZHI Xudong2,FAN Feng2,LI Yugang3

Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (22) : 60-65.

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PDF(1780 KB)
Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (22) : 60-65.

Dynamic failure of a cable-stiffened single layer two-way grid dome under seismic multi-support excitations

  • ZHANG Zhonghao1,2,ZHI Xudong2,FAN Feng2,LI Yugang3
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Abstract

The arrangement of in-plane and out-of-plane cables effectively enhances the stiffness of the two-way grid dome structure and improves the bearing capacity. In this paper, the seismic response and failure characteristics of 60m span cable-stiffened single-layer spherical reticular shell under uniform and multiple-support excitations by considering the spatial variation of ground motion are analyzed. Based on the load displacement response of key nodes, the plastic proportion of the lattice shell member, and the damage degree of the latticed shell, the failure forms of the lattice shell structure under different seismic load amplitude were investigated, and the dynamic failure mechanism of the single-layer spherical lattice shell structure was revealed. The results show that the in-plane and the out-of-plane cables effectively enhances the ductility of the lattice shell structure. Even if the reticulated shell has a large displacement, the structure still not fail. The reticular shell members enters into plasticity from the four end areas under uniform excitation, and the members of reticular shell gradually enters into plasticity from the periphery support and develops to the inner ring under multi-support excitation. Compared with the uniform excitation, the critical load of the two-way grid shell under multi-support excitation is greatly reduced. The failure forms of reticular shell are all strength failure, and the failure characteristics under multi-support excitation strength are more obvious.

Key words

 two-way grid / cable / uniform excitations / multi-support excitations / dynamic failure

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ZHANG Zhonghao1,2,ZHI Xudong2,FAN Feng2,LI Yugang3. Dynamic failure of a cable-stiffened single layer two-way grid dome under seismic multi-support excitations[J]. Journal of Vibration and Shock, 2021, 40(22): 60-65

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