Zhu Yongcheng, Zhu Hua, Gribniak Viktor
Department of Steel and Composite Structures, Vilnius Gediminas Technical University (VILNIUS TECH), Sauletekio Av. 11, LT-10223 Vilnius, Lithuania.
Yancheng Institute of Technology, 1st Xiwangdadao Road, Yancheng 224051, China.
Materials (Basel). 2022 Apr 15;15(8):2901. doi: 10.3390/ma15082901.
A considerable effort to understand the bolted joints' mechanical behavior in pultruded profiles has existed in the literature over the past decades. However, most investigations focused on the single-bolt connections, and only a few works considered single-lap joints. This paper investigates the mechanical performance of a single-lap connection of pultruded glass fiber-reinforced polymer (GFRP) plates owning to the experimental data deficit in the literature. Tensile tests of specimens with different geometries generate a database comprising 80 single-bolt joints. The shear-out failure was predominant for the considered GFRP pultruded plates, with the end length mainly affecting the load-bearing capacity. Hart-Smith's theoretical model overestimated the ultimate resistance of all considered joints-the exceptionally low efficiency of the GFRP composite points out the necessity of additional means for strengthening the drilled connections. Additionally, finite element (FE) software Abaqus simulated the bolted joints; this study employs the user-defined subroutine experimentally verified in the literature. In the considered examples, the ultimate resistance prediction error decreased from 25.7% to 2.9% with increasing the plate thickness (from 4 mm to 8 mm) and width (from 25 mm to 35 mm), which proves the reasonable adequacy of the simplified FE model and makes it a valuable reference for further bolted joints' development.
在过去几十年里，文献中已经有相当多的努力致力于理解拉挤型材中螺栓连接的力学行为。然而，大多数研究集中在单螺栓连接上，只有少数研究考虑了单搭接接头。由于文献中缺乏实验数据，本文研究了拉挤玻璃纤维增强聚合物（GFRP）板单搭接连接的力学性能。对不同几何形状的试件进行拉伸试验，生成了一个包含80个单螺栓接头的数据库。对于所考虑的GFRP拉挤板，冲剪破坏占主导地位，端部长度主要影响承载能力。哈特-史密斯的理论模型高估了所有考虑接头的极限抗力——GFRP复合材料的极低效率指出了加强钻孔连接需要额外手段的必要性。此外，有限元（FE）软件Abaqus对螺栓连接进行了模拟；本研究采用了文献中经过实验验证的用户定义子程序。在考虑的例子中，随着板厚度（从4毫米增加到8毫米）和宽度（从25毫米增加到35毫米）的增加，极限抗力预测误差从25.7%降至2.9%，这证明了简化有限元模型的合理充分性，并使其成为进一步开发螺栓连接的有价值参考。
