Behaviour and design of duplex stainless steel bolted connections failing in block shear
Behaviour and design of duplex stainless steel bolted connections failing in block shear
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DOI：
10.1016/j.engstruct.2024.117442
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发表时间：
2024-01-08
影响因子：
5.5
通讯作者：
Wang，Jia
中科院分区：
文献类型：
--
作者：
Song，Yuchen;Lin，Xue-Mei;Wang，Jia
双相不锈钢（DSS）是一种新兴的结构工程建筑材料，具有高机械强度和优异的耐腐蚀性能。与 DSS 结构构件的大量研究相比，针对这些构件之间的结构接头/连接的现有研究相对有限。出于这一考虑，本文对双相不锈钢螺栓连接（DSSBC）进行了全面的实验和数值研究，重点关注与块体剪切破坏相关的行为和设计。对十一个样本进行了测试，以研究不同螺栓布置对块体剪切行为的影响。此外，还进行了详细的数值研究作为实验测试的补充，其中在有限元建模中考虑了 DSS 的各向异性机械性能。试验分析结果表明，DSSBC的块体剪切破坏模式与碳钢螺栓连接类似，表现为受拉截面颈缩和剪切截面屈服。利用本次研究和以前的研究中获得的实验和数值数据，评估了各种块剪设计方法对不锈钢螺栓连接的适用性。提出了一种更新的设计方法来预测双相和奥氏体不锈钢螺栓连接的块体剪切能力。根据可靠性分析的结果，为所提出的方法建议了适当的部分安全系数/阻力系数。
Duplex stainless steel (DSS) is an emerging construction material for structural engineering, which is featured with high mechanical strength and superior corrosion resistance. Compared with considerable research on DSS structural members, available research is relatively limited for structural joints/connections between these members. In line with this concern, this paper presents a comprehensive experimental and numerical study of duplex stainless steel bolted connections (DSSBCs), focusing on the behaviour and design related to block shear failure. Eleven specimens are tested to investigate the effect of different bolt arrangements on the block shear behaviour. Furthermore, a detailed numerical study was performed as a supplement to the experimental tests, where the anisotropic mechanical properties of DSS are considered in the finite element modelling. Based on the test and analysis results, it is found that the block shear failure mode of DSSBCs resembles that of carbon steel bolted connections, which can be characterised as necking of the tensile section and yielding of the shear sections. Using the experimental and numerical data obtained in this and previous studies, the applicability of various block shear design methods to stainless steel bolted connections is assessed. An updated design method is proposed for predicting the block shear capacity of duplex and austenitic stainless steel bolted connections. A proper partial safety factor/resistance factor is suggested for the proposed method based on the results of reliability analyses.