Seismic Performance Analysis of Large‐Span Steel‐Reinforced Concrete Beam–Column Oblique Angle Joints

ABSTRACT The research investigates the seismic performance of large‐span steel‐reinforced concrete beam–column oblique angle joints in practical engineering applications. Using finite element analysis software, numerical simulations were performed to explore how different parameters affect joint behavior. The findings reveal that oblique‐angle joints exhibit distinct failure modes compared with traditional right‐angle joints. As the oblique angle increases, failure shifts from beam bending failure to shear failure in the joint core, accompanied by a decline in bearing capacity. Furthermore, ductility coefficient, energy dissipation capacity, rotation capacity, and stiffness degradation progressively weaken with larger angles. Parameter analysis demonstrates that joint strength rises with higher concrete and steel strength but decreases under increased axial compression ratios. Meanwhile, ductility coefficient decreases with increasing concrete strength, steel strength, or axial compression. When the oblique angle is within 105°, seismic performance remains relatively stable. However, at 135°, the bearing capacity drops by approximately 20%. Joints using Q355‐grade steel and axial compression ratios below 0.5 demonstrate the best seismic performance. The proposed shear capacity formula aligns closely with finite element results, showing an error margin below 5%, which confirms its accuracy.