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The Failure Mechanism of Single-Layer Saddle Reticulated Shells under Earthquakes

Author: FanQinZuo
Tutor: FanFeng
School: Harbin Institute of Technology
Course: Structural Engineering
Keywords: single-layer saddle-shape reticulated shell severe earthquakes dynamic strength failure geometric imperfection
CLC: TU399
Type: Master's thesis
Year: 2009
Downloads: 64
Quote: 3
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Abstract


Single-layer saddle-shape reticulated shell is a kind of large-span spatial structure, which is developing towards complexity, diversification and spatiality. The latticed shell structures integrat the advantages of truss structures and thin shell structures, have the rational routine for transfering force and can cover large space. Especially, the capability that latticed shells can be subjected to severe seismic motions is most predominant in all structures. So the latticed shell structures are used widely with the progress of economy in our society. But compared with fast development of the latticed shell structures, the anti-seismic theory is still very lagging. Now static stability questions about such structures have been largely settled. However, research on anti-seismic behaviors of latticed shell structures is not enough. This has hindered advanced development of latticed shell structures. To solve these problems, the paper study deeply the failure mechanism of single-layer saddle-shape reticulated shells subjected to severe seismic motion.This thesis presents a systematic study and analysis on the self-vibration properties of single-layer saddle-shape reticulated shells。.In the usual range of some basic parameters(such as span-depth ratio、40m、60m、80mspans、surface mass and so on), by analyzing the vibration modes and natural vibration frequencies。the failure mechanism of single-layer saddle-shape reticulated shells of subjected to severe earthquakes is studied. According to a typical example, the characteristic response of structure under severe earthquakes is investigated and the changing regularity that characteristic response of displacement, different yielded element ratio and different element of failure degree are increased with the load strength is researched. It concluded that the single - layer saddle-shape reticulated shell under severe earthquakes is dynamic strength failure. Moreover, the discriminative method of ultimate strength load based on the comprehension of various characteristic responses is established; the relationship between the changing of ratio of rise to span, different roof mass together with geometric imperfections and the law of the ultimate load are discussed.In addition, In order to investigate the influence of the substructures on the failure behavior of the single-layer saddle-shape reticulated shells subjected to the severe earthquake, this paper builds a more accurate numerical model. Applied on the full-range dynamic response analysis method, two typical failure modes of the single-layer saddle-shape reticulated domes with substructures are illustrated according to the rigidity of substructures. A comprehensively numerical study is carried out on the dynamic behavior of the single-layer saddle-shape reticulated domes subjected to the severe earthquake. Failure criterion is proposed to estimate the ultimate load for the single-layer saddle-shape reticulated dome. It is observed that the single-layer saddle-shape domes with rigid and flexible substructures have higher ultimate load compared with the single-layer saddle-shape with medium rigidity of substructures. The ultimate load increases with the decrease of the rise-span ratio and roof load. The results could provide a reference for the anti-seismic design theory.

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