Failure study of welded joints of steel structures in high-rise buildings under unidirectional loads
In order to ensure the crack resistance of welded joints of steel structures in high-rise buildings under unidirectional loads such as wind load and earthquake load,and to ensure the safety of steel structures in high-rise buildings,the fracture performance of welded joints of steel structures in high-rise buildings under unidirectional loads was studied.Two kinds of beam-column welded joint specimens with single V groove full penetration groove welding and fillet weld were designed.Three-dimensional models of the specimens were generated by finite element simulation software and unidirectional loads were applied to the specimens.The equivalent plastic strain index(PI),cracking index(RI)and stress triaxial degree were used to analyze the fracture morphology of the specimen when the load was applied.The results show that the PI index,RI index and stress triaxial degree of the beam-column welded joint specimens with single V beam-column weld are lower than those with fillet weld in different loading stages,and the bearing capacity of the beam-column welded joint specimens with single V beam-column weld with full penetration groove is not significantly reduced with the increase of load.Therefore,it can be seen that the welded joints of single-V bevelled all-penetration bevelled welding are more suitable for high-rise building steel structures.
unidirectional loadhigh-rise buildingssteel structurebeam and column welding jointscracking index