套筒焊钉连接件抗剪性能与受力机理研究

Shear Performance and Mechanism Analysis of Sleeved Stud Connectors

摘要:

为了研究套筒焊钉连接件的抗剪性能，设计了8个焊钉推出试件，通过静力加载试验测试了套筒焊钉连接件的受力性能，比较了新型套筒焊钉和常规焊钉的抗剪性能差异。参照试验建立Abaqus非线性有限元模型，研究了套筒焊钉连接件的抗剪机理。试验结果表明：套筒焊钉连接件的总体抗剪性能与普通焊钉连接件的接近，与常规焊钉相比，套筒焊钉的极限承载力提升4 %~8 %，抗剪刚度提升25 %~35 %。有限元分析表明：套筒焊钉连接件的抗剪破坏过程与普通焊钉连接件的接近，但套筒焊钉连接件的破坏在焊钉根部的长度范围比普通焊钉的小，焊钉应力比普通焊钉的小；套筒焊钉连接件的混凝土破坏发生在套筒内部的混凝土中，套筒外部的混凝土没有破坏。试验和数值计算表明新型套筒焊钉连接件的力学性能略优于普通焊钉连接件的，在工程中按照普通焊钉连接件的计算方法进行设计计算是可行的。

Abstract:

To investigate the shear performance of sleeved stud connectors， 8 stud push-out specimens were designed， and static loading tests were conducted to evaluate the mechanical performance. The shear performance differences between the novel sleeved studs and conventional welded studs were compared. Referring to the experimental results， an Abaqus nonlinear finite element model was developed to study the shear mechanism of sleeved stud connectors. The experimental results indicated that the ultimate shear bearing capacity and shear stiffness of the sleeved stud connectors are higher than those of ordinary welded studs， and the maximum slip is relatively small. Compared to conventional welded studs， the ultimate bearing capacity of sleeved studs increases by 4 % to 8 %， and the shear stiffness increases by 25 % to 35 %. Finite element analysis shows that the shear failure process of sleeved stud connector is similar to novel sleeved stud connector， but the failure range and stud stress of sleeved stud connector is smaller than that of novel sleeved stud connector. The concrete failure of the sleeved stud connector occurs inside the sleeve， while the concrete outside the sleeve is not damaged. Experimental and numerical analysis have shown that the mechanical properties of the sleeved stud connector are better than those of novel sleeved stud connector. It is feasible to design and calculate sleeved stud connector according to the method of novel sleeved stud connector.