Fatigue crack detection of beam-column joints of building steel structures
In the process of long-term use of steel structures,fatigue cracks are easy to appear at the joints of beams and columns due to the action of cyclic loads.If not detected and treated in time,cracks will expand and eventually lead to fracture,seriously affecting the safety and stability of buildings.Therefore,the fatigue crack detection of beam and column joints of building steel structures under extreme impact loads was carried out.Three kinds of beam-column joint specimens LZ1,LZ2 and LZ3 were prepared with H300 mm×150 mm×6.5 mm×9 mm H-type steel beams and 10.9 M20 high-strength bolts.Among them,LZ1 and LZ2 specimens were made of the same T-shaped steel connection,and LZ2 and LZ3 specimens were made of H-shaped columns of the same material and shape,respectively,and the same impact load was applied to the three specimens,and the fatigue cracks of each specimen were detected by the double-probe penetration detection method.The results show that the fatigue crack length and depth of LZ2 and LZ3 specimens are obviously larger than LZ1 specimens under extreme impact load,and the crack growth rate is relatively high.The fatigue crack propagation rate of LZ1 beam-column joint specimens made of steel-concrete composite columns under extreme impact load is only 0.02×10-4 m/time,and the crack length and depth are small.The double-probe penetration detection method can select the most suitable beam-column joint materials for building steel structures.
万方数据
维普
