锈蚀焊接空心球节点随机抗压承载力研究

焊接空心球节点(WHSJs)自1966年被提出以来,已经广泛地应用于空间网格结构中,至今已有55年的应用历史.由于环境的侵蚀、后期维护不到位等,焊接球节点锈蚀的现象屡见不鲜.该文针对随机锈蚀后焊接空心球节点的抗压承载力的变化规律进行了研究,基于随机有限元分析方法进行了大量的随机数值分析,研究了锈蚀深度概率分布模型对抗压...

RANDOM COMPRESSION CAPACITY OF CORRODED WHSJS

The welded hollow spherical joint (WHSJ) has been widely utilized in reticulated shell structures for 55 years since it was put forward in 1966. The corrosion of WHSJs can always be observed in actual conditions due to the invasion of surrounding environment and the unqualified maintenance. We investigate the axial compression capacity of randomly corroded WHSJs. Numerous numerical analysis was performed based on the stochastic finite element analysis. The influence of the probabilistic distribution model of corroded thickness on the reduction factor of the compression capacity of WHSJs was investigated. Analytical formula for predicting the reduction factor were proposed by curve fitting. The influence of the probabilistic distribution model of the corroded thickness on the changing rule of the reduction factor was revealed based on the numerous results derived from the stochastic numerical analysis. The fitting formula which can be used to predict the probabilistic distribution model of the reduction factor was proposed. The applicability of the conclusions on WHSJs with different geometrical sizes was validated through the results derived from WHSJs with different geometrical parameters. The results indicate that the proposed method can accurately determine the probabilistic distribution model of the reduction factor and the conclusions provide an analytical foundation for estimating the compression capacity of randomly corroded WHSJs.