Pedestrian bridges with I-shaped girders exhibit frequent construction errors and difficulties in the construction of curved sections because the bridges are composed of straight girders mounted on piers. Therefore, a pedestrian bridge utilizing circular steel tubes as the main girder, which is easy to construct and more economical, is proposed to resolve these problems. When steel pedestrian bridges are used for long periods, fractures can occur owing to fatigue in the joints between the main girder and the bottom support. Full-scale circular steel tube joint test units were fabricated and subjected to two million cycles of fatigue performance tests and one million cycles of fatigue fracture tests to quantify the fatigue behavior of a new pedestrian bridge design comprising circular steel tubes. Finite element analysis (FEA) was used to verify the results of the fatigue fracture tests. The proposed pedestrian bridge exhibited excellent stability in terms of fatigue behavior. Moreover, the fatigue fracture of the bridge was successfully predicted using FEA.

具有I形大梁的人行天桥经常出现施工错误，并且在弯曲截面的施工中遇到困难，因为这些桥是由安装在桥墩上的直大梁组成的。因此，为了解决这些问题，提出了一种以圆形钢管为主体的人行天桥，该人行天桥容易施工且经济。长时间使用钢质人行天桥时，主梁与底部支撑之间的连接处会由于疲劳而发生断裂。制造了全尺寸的圆形钢管接头测试装置，并进行了200万次疲劳性能测试和100万次疲劳断裂测试，以量化包含圆形钢管的新型人行天桥设计的疲劳行为。有限元分析（FEA）用于验证疲劳断裂测试的结果。拟议的人行天桥在疲劳性能方面表现出出色的稳定性。此外，使用有限元分析成功地预测了桥梁的疲劳断裂。