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。
In order to study the effect of joint stiffness on the dynamic failure of a single-layer spherical reticulated shell under impact loading,the impact resistance of a K6 scale single-layer spherical reticulated shell was studied.The accuracy and reliability of the finite element analysis method were verified by comparing the experimental and finite element results of the joint displacement,acceleration,bar stress and structural deformation of the reticulated shell.On this basis,the effects of different diameter-thickness ratio of welded ball,different outer diameter ratio of joint and main steel tube,and different wall thickness ratio of joint and main steel tube on the dynamic performance of the reticulated shell were analyzed.Then,the influence of welding defects between the bars and joints on the impact resistance of the reticulated shell was analyzed.The above mentioned three kinds of parameter ratios have 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 outer diameter ratio of welding ball to steel tube.Reducing the three parameter ratios respectively can significantly reduce the vertical displacement at the top of the reticulated shell,thus improving the impact resistance of the lattice shell.Comparing with the analysis results that did not consider the influence of welding defects,the welding defects greatly reduce the impact resistance of the reticulated shell.
作者
苟宝龙
王秀丽
吴长
GOU Baolong;WANG Xiuli;WU Chang(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou 730050,China)
出处
《振动与冲击》
EI
CSCD
北大核心
2022年第18期280-290,共11页
Journal of Vibration and Shock
基金
国家自然科学基金(51778273,51608245)。
关键词
网壳结构
冲击试验
节点刚度
动力失效
reticulated shell
drop impact test
joint stiffness
dynamic failure
