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将一种新型的抗剪栓钉——双钉头型栓钉,应用于钢-混凝土组合桁架梁。通过有限元分析采用双钉头型栓钉的钢-混凝土组合桁架梁的抗弯承载力,比较了采用双钉头型栓钉和传统栓钉的钢-混凝土组合桁架梁的受力特性。由于双钉头型栓钉加强了栓钉底部的刚度,可提高栓钉抗剪承载力。采用双钉头型栓钉对钢-混凝土组合桁架梁弹性刚度的影响可以忽略,但钢-混凝土组合桁架梁塑性阶段的刚度会有明显提高,同时其抗弯承载能力也有一定提高。对比分析表明,采用双钉头型栓钉对非完全抗剪连接的钢-混凝土组合桁架梁受力性能的提高比完全抗剪连接的大。在设计非完全抗剪连接的钢-混凝土组合桁架梁时,建议采用双钉头型栓钉。钢-混凝土组合桁架梁弹性阶段的有效宽度系数近似不变,塑性阶段有效宽度系数随荷载增加逐渐增大。相同条件下,宽跨比和高跨比越大,塑性阶段有效宽度系数越小。
A new type of shear stud - double stud type stud is applied to the steel-concrete composite truss beam. By means of finite element analysis, the flexural capacity of the steel-concrete composite truss beam with double-stud type studs was compared, and the mechanical properties of the steel-concrete composite truss beam with double-stud type studs and traditional studs were compared. As the double stud type peg increases the rigidity of the bottom of the peg, it can improve the peg shear strength. The effect of double-stud type stud on the elastic stiffness of steel-concrete composite truss beam can be neglected. However, the stiffness of the steel-concrete composite truss beam in plastic phase will be obviously improved, and the flexural capacity will also be improved. The comparative analysis shows that the mechanical behavior of the steel-concrete composite truss girder with non-fully shear-connected beams is larger than that of the fully shear-welded joints with double-headed bolt. Double-head studs are recommended when designing steel-concrete composite truss beams that are not fully shear-bonded. The effective width coefficient of the steel-concrete composite truss beam in the elastic phase is approximately the same, and the effective width coefficient of the plastic phase increases with the increase of the load. Under the same conditions, the larger the span ratio and the high span ratio, the smaller the effective width coefficient of the plastic phase.