Abstract This paper presents a thorough experimental and numerical study of the structural behaviour and resistance of S700 high strength steel double shear bolted connections subjected to tension. A total of 38 S700 high strength steel double shear bolted connections were adopted in the tests, and included seven 1-bolt connections (with each containing one bolt), ten 2-pe-bolt connections (with each containing two bolts arranged perpendicular to the load transfer direction), eight 2-pa-bolt connections (with each containing two bolts arranged parallel to the load transfer direction) and thirteen 4-bolt connections (with each containing four bolts arranged in two rows). The specimens were carefully designed with a series of geometric parameters, including the end distance, the edge distance, the longitudinal spacing and the transverse spacing, varied and examined. The test setup, procedures and key results, including the failure loads and modes as well as the load–elongation curves, were fully reported. Two types of failure modes, namely net section fracture and bearing failure, were observed from the tests, with their underlying mechanisms discussed. The effects of various geometric parameters on the failure loads and modes of the S700 high strength steel double shear bolted connection specimens were studied. It was generally found that the net section fracture behaviour and resistance are sensitive to the edge distance and transverse spacing, while the bearing behaviour and resistance are more dependent on the end distance and longitudinal spacing. The experimental programme was supplemented by a numerical modelling programme, where finite element models were initially developed and validated against the test results, and then used for conducting parametric studies to generate further numerical data over a wide range of geometric dimensions. The experimentally and numerically obtained failure loads and modes were then adopted to assess the accuracy of the relevant design rules for high strength steel double shear bolted connections in tension, as given in the European code, American specification and Australian standard. The results of the assessment revealed that (i) the American specification yields the most accurate failure load predictions on average, but with many over-predicted failure loads and inaccurate failure mode predictions, (ii) the Australian standard leads to less accurate but more consistent and safe predictions of failure load than the American specification, and (iii) the European code results in the most conservative and scattered failure load predictions among the three considered design codes, but with the best failure mode predictions. The development of improved design approaches for S700 high strength steel double shear bolted connections is underway.

中文翻译：

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S700高强度钢双剪螺栓受拉连接的试验与数值研究

摘要 本文对受拉的S700 高强度钢双剪螺栓连接的结构行为和抗力进行了深入的实验和数值研究。试验共采用38个S700高强度钢双剪螺栓连接，包括7个1-螺栓连接（每个含1个螺栓）、10个2-PE-螺栓连接（每个含2个垂直于螺栓连接的螺栓）。载荷传递方向），8 个 2-pa-螺栓连接（每个包含两个平行于载荷传递方向的螺栓）和 13 个 4-螺栓连接（每个包含四个排列成两排的螺栓）。试件采用一系列几何参数精心设计，包括端距、边距、纵向间距和横向间距，变化和检查。完整报告了测试设置、程序和关键结果，包括破坏载荷和模式以及载荷-伸长率曲线。从测试中观察到两种类型的失效模式，即净截面断裂和轴承失效，并讨论了它们的潜在机制。研究了各种几何参数对S700高强钢双剪螺栓连接试件破坏载荷和破坏模式的影响。人们普遍发现，净截面断裂行为和阻力对边距和横向间距敏感，而承载行为和阻力更依赖于端距和纵向间距。实验程序由数值建模程序补充，有限元模型最初是根据测试结果开发和验证的，然后用于进行参数研究以生成更广泛的几何尺寸范围内的进一步数值数据。然后采用实验和数值获得的破坏载荷和模式来评估高强度钢双剪螺栓受拉连接的相关设计规则的准确性，如欧洲规范、美国规范和澳大利亚标准中所述。评估结果表明，(i) 美国规范平均产生了最准确的失效载荷预测，但存在许多高估的失效载荷和不准确的失效模式预测，(ii) 与美国规范相比，澳大利亚标准导致对失效载荷的预测不太准确但更加一致和安全，以及 (iii) 欧洲规范在三个考虑的设计规范中导致最保守和最分散的失效载荷预测，但具有最佳故障模式预测。S700 高强度钢双剪螺栓连接的改进设计方法的开发正在进行中。