INVESTIGATION ON ANTI-COLLAPSE PERFORMANCE OF COMPOSITE BEAM-COLUMN SUBSTRUCTURE WITH WELDED FLANGE-BOLTED WEB CONNECTION IN MINOR-AXIS DIRECTION
Xiao-Yan SONG 1, Wei-Hui ZHONG 1* and Yu-Hui ZHENG 1
1 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi'an, China
To analyze the failure mode, mechanical property and resistance mechanism of the substructure with welded flange-bolted web connection in minor-axis direction, a model was established by Alternate Load Path Method. Results showed that the fracture began with the beam tension flange near the failure column, then the reinforcements in the floor slabs were gradually pulled off, followed by the damage and fracture in the tension area near the side column. Finally, the model was deactivate because of slit and damage on bolt holes at the beam near the failure column. At early stage, model is at the flexural phase, where the compressive arch action was played obviously. When entering in large deformation, the axial force of horizontal components increased quickly and provide conditions for the development of catenary effect. On this basis, the height of steel beam and reinforcement ratio were numerical analyzed, the results indicated that the change of parameter has some effect on the initial stiffness and bearing capacity of substructure, which may provide reference on anti-collapse analysis and design for the same type of the composite beam-column substructure.
Connection in minor-axis direction; Welded flange-bolted web connection; Composite beam-column substructure; Reinforced concrete slab; Anti-collapse performance; Numerical analysis