Abstract This study investigates the mechanical behavior of steel fiber-reinforced concrete (SFRC) segments with different joint configurations (bent bolts, inclined bolts, and double-layer bolts) through numerical simulation method verified by laboratory tests, focusing on bending stiffness, ultimate bearing capacity, and failure modes. The results demonstrate that SFRC joints exhibit superior ultimate bearing capacity compared to plain concrete (PC) and reinforced concrete (RC) joints, particularly under positive bending moments, while their stiffness remains comparable to PC joints but lower than RC joints during the moment-increasing phase, indicating limited influence of steel fibers on joint rigidity. Compared with single-bolt designs, the double-layer bolt configuration significantly improves both ultimate bearing capacity and joint stiffness, demonstrating 398% (bent bolts) and 225% (inclined bolts) stiffness enhancement under positive bending, along with 12%-14% ultimate capacity improvement under negative bending. While inclined-bolt joints exhibit intermediate mechanical performance appropriate for conventional applications, double-layer bolt joints provide superior ultimate bearing capacity under negative bending conditions, making them ideal for projects demanding high negative moment resistance.
Abstract：
This study investigates the mechanical behavior of steel fiber-reinforced concrete (SFRC) segments with different joint configurations (bent bolts, inclined bolts, and double-layer bolts) through numerical simulation method verified by laboratory tests, focusing on bending stiffness, ultimate bearing capacity, and failure modes. The results demonstrate that SFRC joints exhibit superior ultimate bearing capacity compared to plain concrete (PC) and reinforced concrete (RC) joints, particularly under positive bending moments, while their stiffness remains comparable to PC joints but lower than RC joints during the moment-increasing phase, indicating limited influence of steel fibers on joint rigidity. Compared with single-bolt designs, the double-layer bolt configuration significantly improves both ultimate bearing capacity and joint stiffness, demonstrating 398% (bent bolts) and 225% (inclined bolts) stiffness enhancement under positive bending, along with 12%-14% ultimate capacity improvement under negative bending. While inclined-bolt joints exhibit intermediate mechanical performance appropriate for conventional applications, double-layer bolt joints provide superior ultimate bearing capacity under negative bending conditions, making them ideal for projects demanding high negative moment resistance.
JIA Yonggang1 HAO Zihan1 LU Weidong1 WU Fan1 YANG Weiwei2
.Mechanical Behavior of Steel Fiber Reinforced Concrete Segments with
Different Joint Configurations[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(4): 182-196
2025, Vol. 62 