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针对三塔斜拉桥在活载作用下的结构刚度问题,以5种跨径三塔斜拉桥为分析对象,通过改变主梁、斜拉索、索塔等主要构件刚度值,计算结构在活载作用下的结构刚度差异,研究了三塔斜拉桥竖向刚度及边塔、中塔纵向变位刚度的影响。研究结果表明:增加索塔刚度尤其是中塔刚度对提高大跨径三塔斜拉桥的结构刚度更经济有效,而对于小跨径的三塔斜拉桥来说,则可通过改变主梁或斜拉索的刚度来实现。斜拉索的刚度对边塔纵向变位刚度的影响较为明显,主梁次之。中塔刚度对中塔纵向变位刚度的影响较为明显,而边中塔刚度同时增加与仅增加中刚度的影响效应相差不到5%。
According to the structural stiffness of the three-pylon cable-stayed bridge under live load, five kinds of span pylon cables are selected as the analysis objects. By changing the stiffness of the main components such as main girder, stay cable and pylon, The difference of structural stiffness under the action of live load is studied. The vertical stiffness of the three-tower cable-stayed bridge and the influence of longitudinal displacement stiffness of side tower and mid-tower are studied. The results show that increasing the stiffness of the tower, especially the mid-tower stiffness, is more economical and effective for increasing the structural stiffness of the long-span three-pylon cable-stayed bridge. For the small-span three-pylon cable-stayed bridge, Or stay-cable stiffness to achieve. The effect of the stay cable stiffness on the longitudinal displacement stiffness of the side tower is obvious, followed by the main beam. The effect of mid-tower stiffness on longitudinal displacement stiffness of mid-tower is obvious, while the effect of simultaneous increase of mid-tower stiffness and mid-tower stiffness is less than 5%.