摘要
本文利用ANSYS有限元程序实现了对钢管相贯节点的弹塑性非线性分析,跟踪结构在整个加载阶段各点的应力、应变变化过程,求出了节点的极限承载力。把本文计算的管节点的荷载位移曲线与文献的试验曲线进行了比较,验证了本文计算方法和计算结果的正确性。文章接着对不同几何参数的XK型圆管相贯节点进行了非线性有限元分析,计算了它们的极限承载力,研究了管节点的受力性能和塑性区的扩展问题。将有限元计算结果与国内规范进行了比较,为规范的进一步修订提供了参考建议。在非线性有限元求解过程中,考虑了网格精度、边界条件、材料特性等因素,使得到的极限承载力具有较高的工程精度。论文在对不同几何参数的XK型空间汇交钢管节点进行大量算例分析的基础上,分析了各参数对节点极限承载力的影响,获得了极限承载力随各几何参数的变化规律以及节点破坏模式,考察了主管所受荷载对极限承载力的影响,提出了对工程设计有益的建议,供工程设计人员和修订规范时参考。
In the paper, nonlinear finite element method (FEM) analysis of multi-planar joints of steel tubular members has been realized by ansys software. It traces the whole process of stress-strain of total loading stages, and the ultimate bearing capacity of the joints is gained. The paper has proved the correction of the methods & results of calculating by comparing the curved line of the loading-displacement of CHS with that gained in experiments. An inelastic and nonlinear finite element analysis of XK-type CHS joints has been completed. Then it makes the nonlinear FEM analysis of the multi-planar XK-type joints of steel tubular members, calculates the ultimate bearing capacity of various geometric parameters joints and does some research on the bearing capacity and plasticity areas. By comparing the results of finite element with domestic code, the paper also provides suggestions for further revising of the code. In order to provide the ultimate bearing capacity with a higher engineering precision, a lot of factors including grid dimension , boundary conditions and material properties are taken into consideration in the nonlinear finite element analysis. Based on a series of numerical analysis of steel tubular XK-type joints of various geometric parameters, the effect of the various geometric parameters on ultimate bearing capacity has been investigated. The regulations that the ultimate strength varies with geometric parameters and the destroying models of joints are obtained. The effect of stress of the chord on the ultimate strength is also investigated. Some constructive suggestions to the engineering design are put forward for reference in design and code revision.
引文
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