Abstract An experimental investigation of four extended end-plate welded girder splices with M20-grade 10.9 bolts, multiple bolt rows, and multiple bolts per row was conducted. Two splices of beam (1.5 m depth with 11 bolt rows and 2 or 6 bolts per row, and 2 splices 1.0 m high with 6 bolt rows and 4 bolts per row were investigated. In both these cases, the bolts were close to the tension flanges. All of these joints can be considered as rigid and partial-strength joints. Experimental research on such end-plate connections has not been previously conducted; therefore, the understanding of the overall structural behaviour of these types of connections is currently insufficient. The main objective of this study was to investigate the bolt-force distribution at the ultimate state of the bolt tension resistance in the connections. The longitudinal strains of bolts in three investigated splices were measured in all rows until the bolts ruptured. The test results for the splice with two bolts per row indicated that forces in bolts adjacent to the web (and distributed along the height of the beam web) were significantly smaller than the T-stub resistance computed according to EN 1993-1-8. Further, the bending-moment resistance of such a connection obtained using the component method overestimated the actual splice resistance. It is concluded that Eurocode procedures do not satisfy safety requirements in the case of multi-bolt row connections.

中文翻译：

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大梁多排螺栓端板拼接试验研究

摘要 对4个M20级10.9螺栓、多排螺栓、每排多螺栓的4个加长端板焊接大梁接头进行了试验研究。研究了两个梁拼接（1.5 m 深，11 排螺栓，每排 2 或 6 个螺栓，2 个拼接高 1.0 m，6 排螺栓，每排 4 个螺栓。在这两种情况下，螺栓都接近受拉法兰。所有这些接头都可以被认为是刚性和部分强度的接头。以前没有对这种端板连接进行过实验研究，因此，目前对这些类型连接的整体结构行为的了解是不够的。本研究的主要目的是研究连接中螺栓抗拉力极限状态下的螺栓力分布。在所有行中测量三个研究接头中螺栓的纵向应变，直到螺栓断裂。每排有两个螺栓的接头的测试结果表明，与腹板相邻的螺栓中的力（并沿梁腹板的高度分布）明显小于根据 EN 1993-1-8 计算的 T 型桩电阻。此外，使用组件方法获得的这种连接的弯矩电阻高估了实际拼接电阻。得出的结论是，在多螺栓排连接的情况下，欧洲规范程序不满足安全要求。每排有两个螺栓的接头的测试结果表明，与腹板相邻的螺栓中的力（并沿梁腹板的高度分布）明显小于根据 EN 1993-1-8 计算的 T 型桩电阻。此外，使用组件方法获得的这种连接的弯矩电阻高估了实际拼接电阻。得出的结论是，在多螺栓排连接的情况下，欧洲规范程序不满足安全要求。每排有两个螺栓的接头的测试结果表明，与腹板相邻的螺栓中的力（并沿梁腹板的高度分布）明显小于根据 EN 1993-1-8 计算的 T 型桩电阻。此外，使用组件方法获得的这种连接的弯矩电阻高估了实际拼接电阻。得出的结论是，在多螺栓排连接的情况下，欧洲规范程序不满足安全要求。