Failure modes and numerical description of grid structure subjected to earthquake

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Journal of Vibration and Shock ›› 2011, Vol. 30 ›› Issue (8) : 45-50.

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Failure modes and numerical description of grid structure subjected to earthquake

ZHANG Cheng1; Wu Hui2; Gao Bo-qing1

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Abstract

Based on large-scale numerical calculations of different forms of grid structure subjected to earthquake, dynamic failure modes and characteristics are analyzed, assuming the failure criteria is maximum displacement exceed 1/50 of the span. Dynamic failure modes of grid structure are determined by four factors: the proportion of 8P bar, maximum displacement during full-time history, the average plastic strain energy, and the ratio of the average and maximum displacement before expiration. As the failure mode is fuzzy, the four factors are analyzed using fuzzy C-means method, and the failure modes are classified into three categories: instability-based progressive collapse, strength-based overall collapse and strength-based progressive collapse, which are described by natural and numerical language respectively. The results show that fuzzy C-means method can effectively classify the failure modes of grid structure, and transform the description from natural to numerical. The numerical prototypes of failure modes are obtained, which can be used to recognize other unknown grids, and lay the foundation for performance-based design.

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grid structure / failure mode / fuzzy c-means / numerical description

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ZHANG Cheng;Wu Hui;Gao Bo-qing. Failure modes and numerical description of grid structure subjected to earthquake[J]. Journal of Vibration and Shock, 2011, 30(8): 45-50