Abstract Due to increasing seismic risk, seismic design has become mandatory even for low-rise structures in Republic of Korea since December 2017. However, it is not difficult to find undesirable exposed column-base plate strong-axis joints of low-rise steel buildings in the field. Such undesirable connections might not have sufficient capacity and stability under earthquake. Therefore, a series of experiments were carried out to develop improved exposed column-base plate strong-axis joints of low-rise steel buildings. In total, seven large-scale column-base plate strong-axis connection specimens were investigated under both axial compression and lateral cyclic loading. It was found that the hysteretic behavior of such improper joints typically used in the field was unstable due to a “rocking” phenomenon between a base plate and concrete foundation by large plastic residual deformation of anchor bolts. To overcome the rocking phenomenon, efforts were made to develop enhanced connections. Based on the test results, considerably improved and stable hysteretic behavior without the rocking phenomenon was obtained by using eight threaded anchor bolts. However, further study is needed to assess the effect of eight threaded anchor bolts on the seismic performances of more various connections.

中文翻译：

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改进型低层钢结构明柱底板强轴节点的研制

摘要 由于地震风险的增加，韩国自 2017 年 12 月以来，即使是低层结构的抗震设计也成为强制性要求。然而，不难发现低层钢结构建筑不受欢迎的外露柱底板强轴节点。在该领域。这种不受欢迎的连接在地震下可能没有足够的容量和稳定性。为此，开展了一系列改进的低层钢结构建筑外露柱底板强轴节点试验。总共研究了七个大型柱底板强轴连接试件在轴向压缩和横向循环载荷下。研究发现，由于地脚螺栓的较大塑性残余变形，在底板和混凝土基础之间产生“摇摆”现象，因此现场使用的这种不正确接头的滞后行为是不稳定的。为了克服摇摆现象，努力开发增强的连接。根据测试结果，使用八个螺纹地脚螺栓获得了显着改善和稳定的滞后行为，没有摇摆现象。然而，需要进一步研究以评估八个螺纹地脚螺栓对更多不同连接的抗震性能的影响。通过使用八个带螺纹的地脚螺栓，显着改善和稳定的滞后行为没有摇摆现象。然而，需要进一步研究以评估八个螺纹地脚螺栓对更多不同连接的抗震性能的影响。通过使用八个带螺纹的地脚螺栓，显着改善和稳定的滞后行为没有摇摆现象。然而，需要进一步研究以评估八个螺纹地脚螺栓对更多不同连接的抗震性能的影响。