重庆渝北体育馆铸钢节点受力性能分析

LOADING BEHAVIOR OF THE CAST STEEL JOINT OF YUBEI GYMNASIUM IN CHONGQING

重庆渝北体育馆屋盖结构设计中采用大型铸钢节点,该铸钢节点的安全直接关系到整个结构的安全。为深入了解该铸钢节点的受力性能并确保结构在设计荷载下的安全性,根据设计要求对该铸钢节点进行精细有限元分析,从而了解该铸钢节点在设计荷载下的受力特征以及弹塑性极限承载性能。分析表明,该节点圆弧过渡区域存在应力集中现象。着重研究不同角度杆件交汇处的过渡圆弧半径对圆弧过渡区域应力集中的影响。分析结果表明:当铸钢节点处于弹性工作阶段时,过渡圆弧半径取临界半径值,能够显著降低圆弧过渡区域的应力集中,延缓节点屈服的进程。增大过渡圆弧半径时,当铸钢节点处于弹性工作阶段,小角度交汇处应力集中降低程度较大;当铸钢节点处于屈服阶段,大角度交汇处应力集中降低程度较大。

Some giant cast steel joints are adopted in the design of Yubei Gymnasium in Chongqing,which have critical influence on the safety of the structure.In order to obtain the loading behavior and the loading bearing capacity of the cast steel joints,the refined finite element analysis is conducted.The stress distribution under the design load and the elastic-plastic ultimate bearing capacities of the cast steel joints are computed.The elastic-plastic analysis indicates that the stress concentration exists in the filleted corners of the joint.The stress concentration of the cast-steel joints is also computed and compared under the different radius of filleted corners.The results show that critical radius of filleted corners can significantly decrease the stress concentration of the joints,slow down the process of destruction when the joint is in the elastic stage.When the joint is in the elastic stage,the decreasing ration of stress concentration increases with the decrease of the intersecting angel between two members.While in the yield stage,the decreasing ration of stress concentration increases with the increase of the intersecting angel.