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焊接空心球节点是网架结构合理的节点型式。本文从理论和试验两方面对其静力及疲劳性能进行了试验研究。利用有限元计算和大量应变实测基本摸清了单向受拉弹性阶段球面应力分布的规律,通过理论及200多个试验数据的综合分析,提出了新的简单、合理的承载力计算公式。通过四种规格15个试件的疲劳试验,得到了S-N曲线,借助薄壳理论分析求得SCF计算公式,并将热点应力幅的概念用于研究,建立了适用于各种管球配合的剖口焊情况下疲劳验算方法。
The welded hollow ball node is a reasonable node type of the grid structure. In this paper, the static and fatigue properties of the test are studied in both theory and test. Using the finite element calculation and a large number of strain measurements, the rules of the stress distribution in the uniaxial tension stage are clearly understood. Through the theoretical analysis and comprehensive analysis of more than 200 test data, a new simple and reasonable calculation formula for bearing capacity is proposed. Through the fatigue test of 15 specimens of four specifications, the SN curve was obtained. The calculation formula of SCF was obtained by thin-shell theory analysis, and the concept of hotspot stress amplitude was used for research, and a profile suitable for various pipe ball coordination was established. Fatigue checking method in mouth welding.