黄石奥体中心体育场铸钢节点受力性能试验研究

Experimental Study on the Mechanical Behavior of Cast Steel Joint Used in Huangshi Olympic Sports Center

黄石奥体中心体育馆钢结构罩蓬采用了树状支撑铸钢节点,为考察其在最不利设计工况下的受力性能,对树状支撑铸钢节点进行了足尺试验研究和非线性有限元分析。试验结果表明,在1.3倍设计荷载工况作用下,节点处于弹性状态,卸载后没有明显残余变形。有限元分析结果与试验结果吻合良好,弹塑性有限元分析得到的铸钢节点极限承载力满足《铸钢节点应用技术规程》中的相关要求,该铸钢节点具有较高的强度储备。分析了轴力与弯矩共同作用下铸钢空心球节点的应力分布规律,可为铸钢空心球节点的设计提供参考。

Cast steel joints are introduced into the dendriform roof structure for the Huangshi Olympic Sports Center.Full scale test and nonlinear finite element(FE)analysis are carried out to investigate the mechanical behavior of the cast steel joints under the most unfavorable design load condition.The results indicate that the cast steel joint exhibits elastic behavior up to 130% design load,and no residual deformation after unloading is observed.The FE results agree well with the test data,and the ultimate load-bearing capacity of the cast steel joint obtained from the elastic-plastic FE analysis satisfies the relevant requirements from the Technical Specification for Application of Connections of Structural Steel Casting,with relatively high strength reserve being achieved.Moreover,the stress distribution pattern of cast steel hollow spherical joint subjected to axial load and bending moment is analyzed,and this provides reference for the design of cast steel hollow spherical joints.