纵肋与横隔板新型构造细节疲劳性能研究

Research on the Fatigue Performance of Novel Rib-to-Diaphragm Joints

为提升纵肋与横隔板构造细节的疲劳性能,将横隔板在一定区域范围内与纵肋底板进行焊接连接,加强两者的协同受力,进而改善其疲劳性能,在此基础上发展了两种纵肋与横隔板新型构造细节并对其疲劳性能进行系统研究。结果表明:在纵向移动荷载作用下,纵肋与横隔板普通开孔构造细节的主导疲劳开裂模式为纵肋腹板围焊焊趾开裂并沿纵肋腹板扩展且以承受拉-拉循环应力为主;两种纵肋与横隔板新型构造细节的主导疲劳开裂模式均以承受压-压循环应力为主,其中以新型构造细节1的受力最为合理,其主导疲劳开裂模式为纵肋底板围焊端部焊趾开裂并沿纵肋底板扩展,相较于纵肋与横隔板普通开孔构造细节,其应力幅值降低约12.4%,疲劳性能得到有效提升。

In order to improve the fatigue performance of rib-to-diaphragm joint,two types of novel rib-to-diaphragm joints in OSD were proposed.For the novel welded joints,the floor of rib and diaphragm are connected by welding to enhance the cooperative working performance.The rib-to-diaphragm joints were taken as the research object,and its fatigue performance were studied systematically.The results indicate that the predominant crack pattern of the conventional rib-to-diaphragm joint is cracking initiated from the rib toe that propagated through the web plane of rib,and the stress state of cracking patternⅠis mainly in the tensile state.The predominant crack pattern of the two novel welded joints are mainly in the compressive state,and the novel welded joint 1 is the most reasonable one among the three types of novel welded joints.The predominant crack pattern of the novel welded joint 1 is cracking initiated from the rib toe that propagated through the floor plane of rib.Compared with the conventional rib-to-diaphragm joint,the stress range of the novel welded joint 1 is reduced by 12.4%,and the fatigue performance is effectively improved.