Experimental and Numerical Study on the Shear Performance of High-Ductility Steel Bolts

This study addresses the low ductility and limited shear resistance of conventional rock bolts by developing a high-ductility anchorage system using S32001 duplex stainless steel. Through double-shear tests and numerical simulations， the shear deformation behavior and load-transfer mechanism were systematically analyzed. Results show that the S32001 bolt exhibits approximately 80% higher shear capacity than HRB400 steel and achieves an axial mobilization ratio of 58.22%， maintaining stable resistance under large deformation. Numerical results reveal a coupled tension-bending failure mode with plastic hinge formation along the joint surface. The findings confirm the feasibility of S32001 as a high-ductility bolt material and provide new insights for slope stabilization under complex geological conditions.