Numerical simulation and failure mode discrimination method for single-layer cylindrical reticulated shell under impact load

Abstract

The invention discloses a numerical simulation and failure mode discrimination method for a single-layer cylindrical reticulated shell under an impact load. The method comprises the following steps: establishing a finite element analysis model; by changing the impact direction, the impact angle, the mass of an impact object and the speed, the structural deformation and the rod piece damage condition under different impact parameters are determined; extracting feature response indexes of the structure according to numerical simulation results of the structure under different parameters; and analyzing the characteristic response index of the structure and determining the failure mode of the structure according to the deformation characteristic of the structure and the damage condition of the rod piece. According to the method, the randomness of the impact load in numerical simulation more considers real factors, various situations when the single-layer cylindrical reticulated shell is impacted can be comprehensively simulated, and all failure modes generated by the structure are determined and divided according to the dynamic response generated by the structure and structural deformation characteristics; and a more accurate reference basis is provided for the subsequent design of the single-layer cylindrical reticulated shell structure.

Description

technical field [0001] The invention belongs to the technical field of impact resistance of space structures, and in particular relates to a method for numerical simulation and failure mode discrimination of a single-layer cylindrical reticulated shell under impact load. Background technique [0002] In recent years, with the rapid development of science and technology, and the prosperity of the social economy, people's requirements for buildings are not only as simple as living As well as large-scale landmark buildings with large spans. The reticulated shell structure has been recognized by the public for its beautiful appearance and large built-in space. It is one of the main structural forms of large-span space structures because of its high rigidity, light weight, reasonable stress, high stability, and small structural deformation. It is widely used in large public buildings such as station waiting halls, stadiums, exhibition halls and so on. In recent years, with the ...

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Problems solved by technology

Buildings are also very likely to be damaged or even collapsed by such phenomena. Once collapsed, it will pose a huge threat to the lives of people around them, cause huge property losses, and have a negative impact on social and economic development.

[0003] At present, research on the impact resistance of structural components and the impact resistance of the overall structure has achieved fruitful results at home and abroad. Among them, the research on the impact resistance of long-span space reticulated shell structures is becoming more and more extensive. The research on the dynamic response under the action is far from enough. There is a lack of discrimination methods and criteria for the overall failure of the structure under the action of the dynamic load and the study of the failure mechanism. There is a large deviation between the evaluation of the failure load and the actual use; the theory of dynamic instability Research and experimental studies are not systematic enough

At present, most of the research on the impact resistance of large-span space reticulated shells is concentrated on single-layer spherical reticulated shells, and there are few studies on single-layer cylindrical reticulated shells, especially considering the contingency of impact loads, the impact direction and angle of impact on single-layer cylindrical reticulated shells. The failure of the reticulated shell will affect the

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