Research on the dynamic buckling of a typical deck grillage structure subjected to in-plane impact Load. (July 2021)

• Record Type: Journal Article
• Authors: Kong, Xiangshao; Zhou, Hongchang; Zheng, Cheng; Pei, Zhiyong; Yuan, Tian; Wu, Weiguo
• Is Part Of: Marine structures. Volume 78(2021)
• Publication Date: 2021-07
• Subjects: Dynamic buckling -- Deck grillage -- Ultimate strength -- In-plane impact -- Initial stress and deflection; Naval architecture -- Periodicals; Offshore structures -- Periodicals; Architecture navale -- Périodiques; Structures offshore -- Périodiques; Naval architecture; Offshore structures; Periodicals; 620.4162
• DOI: 10.1016/j.marstruc.2021.103003
• Languages: English
• ISSNs: 0951-8339

Abstract

Abstract: The dynamic buckling of the main deck grillage would result in the total collapse of the ship hull subjected to a far-filed underwater explosion. This dynamic buckling is mainly due to the dynamic moment of the ship hull when the ship hull experiences a sudden movement under impact load from the explosion. In order to investigate the ultimate strength of a typical deck grillage under quasi-static and dynamic in-plane compressive load, a structure model, in which the real constrained condition of the deck grillage was taken into consideration, was designed and manufactured. The quasi-static ultimate strength and damage mode of the deck grillage under in-plane compressive load was experimentally investigated. The Finite Element Method (FEM) was employed to predict the ultimate strength of the deck grillage subjected to quasi-static in-plane compressive load, and was validated by comparing the results from experimental tests and numerical simulations. In addition, the numerical simulations of dynamic buckling of the same model under in-plane impact load was performed, in which the influences of the load amplitude and the frequency of dynamic impact load, as well as the initial stress and deflection induced by wave load on the ultimate strength and failure mode were investigated. The results show that the dynamic buckling mode is quite different from the failure mode of the structure subjected to quasi-static in-plane compressive load. The displacements of deck edge in the vertical direction and the axial displacements are getting larger with the decrease of impact frequency. Besides, it is found that the dynamic buckling strength roughly linearly decreased with the increase of initial proportion of the static ultimate strength P 0 . The conclusions drawn from the researches of this paper would help better designing of the ship structure under impact loads. Highlights: Experiment and numerical simulations of buckling of the typical deck grillage structure subjected to in-plane quasi-static compressive load were performed. The ultimate strength and damage mode of dynamic buckling of the deck structure was investigated numerically. The influences of the duration of the impact load on the dynamic buckling of the deck structure was revealed. The differences of buckling of the deck structure subjected to quasi-static load and impact load were compared and analyzed.