Severe damage to towers of cable-stayed bridges have been recorded in past actual earthquakes. Therefore, increasing attention has been devoted to the seismic failure of cable-stayed bridges under strong earthquakes. However, few experimental studies focus on the seismic failure of long-span cable-stayed bridges including both superstructures and substructures under strong earthquakes. In this paper, a 1/70-scaled bridge full-model was designed and assembled following a 1400 m-span cable-stayed bridge, which was composed of the towers, girder, cables, piers, pile groups, and artificial soil placed in four shear boxes. Shaking table tests were conducted to study the seismic response and potential failure mode of towers of the bridge full-model under transverse earthquake excitation. Test results show that the tower exhibits an unexpected failure mode with the double plastic hinges, which reveals a new feature for the seismic failure of the tower of super long-span cable-stayed bridges. The plastic hinges are firstly observed at near the junction region between the tower and lower beam, then at the proximal joint portion between the tower and upper beam. The tower firstly suffers from severe damage or even local failure for the bridge full-model under strong earthquakes, but it could carry the vertical load. The seismic damage evaluated by the curvature criteria or residual displacements are in good agreement with the observed damage under earthquake excitation with low shaking amplitudes. Moreover, numerical modeling of the bridge full-model could effectively predict the dynamic properties and seismic response of the bridge full-model, and capture the character of the failure mode of the towers compared to the test results.

在过去的实际地震中，已记录到斜拉桥塔的严重损坏。因此，人们越来越关注强地震作用下斜拉桥的地震破坏。然而，很少有实验研究集中于大跨度斜拉桥在强地震下的地震破坏，包括上部结构和下部结构。本文按照1400 m跨度的斜拉桥设计并组装了1/70比例的全模型，该斜拉桥由塔，箱梁，电缆，墩，桩群和放置在其中的人工土组成四个剪切盒。进行了振动台试验，以研究横向地震激励下全模型桥梁塔架的地震响应和潜在破坏模式。试验结果表明，双塑料铰链使塔架出现了意外的破坏模式，这为超大跨度斜拉桥塔架的地震破坏提供了新的特征。首先在塔架和下部梁之间的接合区域附近观察塑料铰链，然后在塔架和上部梁之间的近端接合部分观察到塑料铰链。在强地震下，该塔首先对全模型的桥梁遭受严重破坏，甚至遭受局部破坏，但它可以承受垂直载荷。通过曲率准则或残余位移评估的地震破坏与在低振动幅度的地震激励下观察到的破坏非常吻合。此外，