冲击作用下节点刚度对单层网壳结构动力失效的影响研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (18) : 280-290.

论文

苟宝龙1，2，王秀丽1,2，吴长1,2

作者信息 +

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

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

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文章历史 +

摘要

为了深入研究节点刚度对单层球面网壳在冲击作用下动力失效的影响，采用K6型缩尺单层球面网壳进行抗冲击性能试验研究，将试验结果与有限元模拟得到的节点位移、加速度和杆件应力以及结构变形进行分析对比，验证了有限元分析方法的准确性与可靠性。基于试验与有限元模拟结果，分析了焊接球不同径厚比、球管不同外径比、球管不同壁厚比以及杆件与节点之间的焊接缺陷对网壳失效过程中的冲击力、应变能和网壳顶部竖向位移的影响。研究结果表明：减小径厚比可显著提高结构应变能，减小球管外径比，可减小冲击力，减小径厚比、球管外径比及壁厚比均可显著减小网壳顶部竖向位移，提高网壳的抗冲击性能。与未考虑焊接质量影响的分析结果相比，焊接质量缺陷大大降低了网壳的抗冲击性能。
关键词：网壳结构；冲击试验；节点刚度；动力失效

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

导出引用

苟宝龙1，2，王秀丽1,2，吴长1,2. 冲击作用下节点刚度对单层网壳结构动力失效的影响研究[J]. 振动与冲击, 2022, 41(18): 280-290

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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