College of Civil Engineering, Nanjing Tech University, Nanjing, China.
Math Biosci Eng. 2019 May 14;16(5):4213-4228. doi: 10.3934/mbe.2019210.
In this study, we investigate the pull-out performance of bolted joints of pultruded fiber reinforced polymer (PFRP) profile specimens with drilled and punched holes, respectively, and investigate the effects of different resin matrices and different fiber directions on the pull-out performance of the bolted joints. The experiment results show that the pull-out performance of the bolted joints in the uni-axial polyurethane-based PFRP is better than that in the uni-axial unsaturated polyester resin-based PFRP. The pull-out capacity of bolted joints on the multi-axial PFRP specimens with drilled holes is better than that of bolted joints in the uni-axial PFRP specimens with drilled holes. The multi-axial fiber can effectively prevent longitudinal splitting of pultruded profiles and significantly improve their pull-out performance. The punching process has little impact on the pull-out performance of bolted joints in the uni-axial PFRP specimens. However, it greatly undermines the pull-out performance of the bolt hole of the multi-axial PFRP specimens. Finally, using the progressive damage analysis (PDA) model, and combined with the Hashin failure criteria, we establish a model by means of the C3D8R solid elements in ABAQUS to simulate the pull-out mechanical behavior of the bolted joints.
在这项研究中，我们分别研究了带有钻孔和冲孔的拉挤纤维增强聚合物（PFRP）型材试件的螺栓连接的拔出性能，并研究了不同树脂基体和不同纤维方向对螺栓连接拔出性能的影响。实验结果表明，在单轴聚氨酯基 PFRP 中的螺栓连接的拔出性能优于在单轴不饱和聚酯树脂基 PFRP 中的螺栓连接的拔出性能。带有钻孔的多轴 PFRP 试件上的螺栓连接的拔出能力优于带有钻孔的单轴 PFRP 试件上的螺栓连接的拔出能力。多轴纤维可有效防止拉挤型材的纵向开裂，并显著提高其拔出性能。冲孔工艺对单轴 PFRP 试件中螺栓连接的拔出性能影响不大，但大大削弱了多轴 PFRP 试件中螺栓孔的拔出性能。最后，我们使用渐进损伤分析（PDA）模型，并结合 Hashin 失效准则，通过 ABAQUS 中的 C3D8R 实体单元建立了一个模型，以模拟螺栓连接的拔出力学行为。
