Research on Mechanical Properties of Connecting Nodes between Modules of FRP Lightweight Emergency Bridge
The mechanical properties of connection joints between modules of a high-bearing and long-span emergency repair bridge were studied.The ultimate bearing capacity of the designed single and double-ear joints of two structural forms(A form and B form)was tested through experiments.Then,the numerical models of the single and binaural joints of the two structural forms were established by ANSYS and the correctness of the models was verified,and the reasons for the differences in the mechanical properties of the single and binaural joints of the two structural forms were explored.The results show that the use of B form of single and double ear joints can effectively improve the ultimate bearing capacity of the single and double ear joints without increasing the weight of the nodes.When single and double ears are connected as pipes,the lug plate changes from linear transmission to arc transmission in the process of force transmission,resulting in uneven force transmission and uneven force on the connected parts,and finally leads to the welding seam at the weak point of the joint.It fails due to stress concentration,while the setting of asymmetric chamfers at the root of the ear plate of the B-type single and binaural joint and the use of variable cross-section transitions can effectively improve the stress concentration at the joints,and improve the mechanical properties and lightweight level of the single and binaural connection joints.
万方数据
维普
