Abstract：The long-span floating bridge supported by tension leg foundations is a new type of sea-crossing bridge structure. The tension leg foundation significantly affects the structural responses under the wind and wave loads due to its weak lateral stiffness. This paper proposes the wind-wave load calculation of floating bridges and the finite element analysis method of structural motion response. A floating suspension bridge with a tension leg foundation is taken as an example. The effects of the design parameters of the tension leg foundation, such as the foundation flooded depth and the angle of tension leg cables, on the lateral and vertical stiffness and the dynamic responses of the structure under the wind and wave loads, are analyzed. The main conclusions can be drawn as follows: 1) The wind load dominates the response of the girder of a floating bridge; 2) The vertical stiffness can be improved by increasing the foundation flooded depth, so the motion responses of the long-span floating bridge can be reduced; and 3) the lateral and vertical motion of the structure can be reduced effectively when the inclination angle of tension legs is between 75°～80°. The inclination angle can increase both the lateral stiffness and the main girder’s motion response. The stiffness of the tension leg foundation dominates the dynamic response of the long-span floating bridge structure and should be focused in the structural design.
魏凯 张枫 廖翔 秦顺全. 张力腿基础刚度对大跨浮式悬索桥风-浪动力响应的影响[J]. 土木工程学报, 2022, 55(6): 47-61, 101.
Wei Kai Zhang Feng Liao Xiang Qin Shunquan. Effect of tension leg foundation stiffness on dynamic responses of a long-span floating suspension bridge under wind and wave loads. 土木工程学报, 2022, 55(6): 47-61, 101.
