L形钢管柱灌浆套管连接弯剪性能研究OA

This paper proposes an L-shaped column grouted sleeve connection for beam-column joints in modular prefabricated steel structures and investigates its bending-shear performance.Six L-shaped column grouted sleeve connection specimens were designed and fabricated.Three-point and four-point bending tests were conducted,followed by finite element parametric analysis.The study primarily examines the combined bending-shear capacity and pure bending capacity of the connection under different inner sleeve lengths.Experimental results indicate that within the tested range of inner sleeve lengths,increasing the inner sleeve length significantly enhances the connection's combined bending-shear capacity,pure bending capacity and ductility.For grouted connections with identical dimensions,the combined bending-shear capacity and pure bending capacity are nearly equivalent.Finite element analysis reveals that when the inner sleeve length exceeds a specific threshold,further increases in inner sleeve length have limited effects on the connection's bending-shear and pure bending capacities.Increasing the inner sleeve length improves the stress state at the axial weld of the L-shaped column body.The combined bending-shear capacity and pure bending capacity of the grouted connection are jointly governed by the failure resistance of the grout material and the inner sleeve cross-section.Specifically,the anti-failure capacity of the grout interlayer is influenced by the inner sleeve length,while that of the inner sleeve cross-section depends on its resistance moment of the normal section.Additionally,the bending capacity of the L-shaped column grouted connection varies with the direction of the bending moment,reaching its minimum value under weak-axis positive bending.