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采用有限元方法,对冷弯不锈钢方管、矩形管支撑和弦杆中的T型、X型及预应力X型节点进行数值分析。考虑几何非线性和材料非线性,获得节点承载力、破坏模式及荷载-位移曲线。利用试验结果,对T型、X型矩形管、方管节点的非线性有限元模型进行修正,直到有限元结果和试验结果足够吻合。采用修正后的有限元模型对172个T型、X型节点进行参数分析,研究冷弯不锈钢管节点强度和性能的影响。将数值分析和试验中获得的节点承载力与按规范计算的设计承载力进行对比。对不锈钢管结构,采用澳大利亚规范、新西兰规范计算;对碳素钢管结构,采用国际管结构发展与研究委员会设计规范和欧洲设计规范计算。通过可靠性分析,分别评价本文提出的设计方法和现有规范的可靠度。结果表明:采用本文方法计算的设计承载力更准确、更可靠。
The finite element method is used to analyze the T-shaped, X-shaped and prestressed X-joints in cold-formed stainless steel square tube and rectangular tube brace chord. Considering geometric nonlinearity and material nonlinearity, the node bearing capacity, failure mode and load-displacement curve are obtained. Based on the test results, the nonlinear finite element model of T-shaped, X-shaped rectangular tube and square tube joints is modified until the FEA results are in good agreement with the experimental results. The modified finite element model was used to analyze the parameters of 172 T-type and X-type joints to study the influence of the strength and performance of cold-formed stainless steel pipe joints. Comparing the node bearing capacity obtained in numerical analysis and experiment with the designed bearing capacity according to the code. The stainless steel pipe structure, the use of Australian norms, New Zealand norms; the carbon steel pipe structure, using the International Pipe Structure Development and Research Commission Design Code and European Design Code calculation. Through the reliability analysis, the reliability of the design method and the existing specifications proposed in this paper are respectively evaluated. The results show that the design capacity calculated by this method is more accurate and reliable.