空间圆钢管K型相贯节点刚度公式数值研究

Numericalresearch of stiffness formulas of multi-planar K-type steel tubular joint

为了研究圆钢管K型相贯节点平面内、外刚度性能,以平南三桥为工程背景,采用正交试验法对K型相贯节点的相贯角度、支主管径比、主管外径与支管间距之比、主管径厚比、支管外径与主管壁厚之比等确立计算模型的具体参数,运用ABAQUS软件对计算模型进行分析,并应用多元线性归回方法拟合出空间K型相贯节点刚度的参数公式。对钢管拱中K型空间相贯节点进行轴力、平面内弯矩、平面外弯矩共同作用下的单调弹性加载缩尺试验,得到节点的变形行为,并验证参数公式的准确性。研究分析表明:所提出的K型节点刚度公式结果与试验结果吻合较好,与有限元结果误差小于11.1%,可应用于工程实际。此外,K型节点的主管径厚比、相贯角度、支主管径比是影响空间K型节点刚度的主要因素,节点刚度随着管径厚比降低而提高。

The performance of in-plane and out-of-plane stiffness were studied based on background of the Third PingNan Bridge.The specific parameters were confirmed by using the orthogonal testing method,which includes the angle between brace and chord,brace-to-chord diameter ratio,the diameter of chord to the spacing of brace ratio,the diameter of chord to the thickness of chord ratio and brace-to-chord thickness ratio of multi-planar,etc.And the finite element models were built by three-dimensional finite element analysis software ABAQUS.The parametric formulas of stiffness were simulated by using the multi-variable linear regression analysis.The results of deformational behavior and the static elastic stiffness of multi-planar K-type joints in steel tube arch were obtained and analyzed by the reduced scale model tests under the combined action of axial force,in-plane bending moment and out-of-plane bending moment,which validated the proposed parametric formulas.The research and analysis show that the proposed K-joint stiffness formula is in good agreement with the test results and the error between the results of the proposed K-joint stiffness formulas and the test is less than 11.1%,which justifies application of the fomula in practical engineering projects.In addition,the main factors affecting the stiffness of K-joints are the diameter of chord to the thickness of chord ratio,the angle between brace and chord and brace-to-chord diameter ratio.The stiffness of K-joints increases with the decrease of the diameter of chord to the thickness of chord ratio.