Effect of joint stiffness on the dynamic failure of a single-layer reticulated shell under impact loading

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (18) : 280-290.

GOU Baolong1,2， WANG Xiuli1,2， WU Chang1,2

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Abstract

In order to study the effect of joint stiffness on the dynamic failure of single-layer spherical reticulated shell under impact load, the impact resistance of K6 scale single-layer spherical reticulated shell is studied. The accuracy and reliability of the finite element analysis method are verified by comparing the experimental results with the joint displacement, acceleration, bar stress and structural deformation obtained from the finite element simulation of the reticulated shell. Based on the experimental results and the finite element simulation results, the effects of different diameter-thickness ratios of welded balls, different outer diameter ratios of joints and main steel tubes, and different wall thickness ratios of joints and main steel tubes on the dynamic performance of reticulated shells are analyzed. Then, the influence of welding defects between the bars and joints on the impact resistance of the reticulated shell is analyzed. The above three parameters have a greater influence on the impact force, strain energy and top displacement of the structure during the failure process of the reticulated shell. The results show that reducing the diameter to thickness ratio of welded ball can significantly increase the strain energy of the structure. The impact force can be reduced by reducing the outside diameter ratio of welding ball to steel tube. Reducing the three parameters respectively can significantly reduce the vertical displacement of the top of the reticulated shell, thus improving the impact resistance of the lattice shell. Compared with the analysis results that did not consider the influence of welding defects, the welding defects greatly reduced the impact resistance of the reticulated shell.
Key words: reticulated shell; drop impact test; joint stiffness; power failure

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reticulated shell / drop impact test / joint stiffness / power failure

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GOU Baolong1,2， WANG Xiuli1,2， WU Chang1,2 . Effect of joint stiffness on the dynamic failure of a single-layer reticulated shell under impact loading[J]. Journal of Vibration and Shock, 2022, 41(18): 280-290

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