During the 2011 Tohoku Earthquake, a truss bridge joint structure was cracked due to large cyclic deformation, making us recognize the importance of assessing the seismic performance of joint structures in truss bridges from the viewpoint of low-cycle fatigue. In this study, seismic response analysis of an actual deck truss bridge was performed under different seismic waves, and local strain behavior generated at welded joints around a joint structure was clarified using a zooming analysis technique. The results revealed the possibility that welded joints for a lateral gusset-plate in a joint structure can be cracking sites during earthquakes. In addition, it was indicated that seismic isolation bearings can significantly reduce the local strain at the joint structure and improve its low-cycle fatigue performance. Moreover, as a simple countermeasure, weld toe treatment by grinding is also effective to decrease the possibility of low-cycle fatigue cracking at the joint structure.

在2011年东北地震中，桁架桥的节理结构由于较大的周期性变形而破裂，这使我们认识到从低周疲劳的角度评估桁架桥的节理结构的抗震性能的重要性。在这项研究中，对实际甲板桁架桥在不同地震波下的地震响应进行了分析，并使用缩放分析技术阐明了接头结构周围焊接接头处产生的局部应变行为。结果表明，在地震过程中，节点结构中的侧边角撑板的焊接接头可能会成为裂纹点。此外，还表明，隔震轴承可以显着减小接头结构处的局部应变，并改善其低周疲劳性能。此外，