港珠澳大桥岛桥结合部结构的波浪力试验研究

Experimental study on wave force of island-bridge joint structure of Hong Kong-Zhuhai-Macao Bridge

港珠澳大桥岛桥结合部桥面高程较低,设计水位和波浪条件下波浪对岛桥结合部的桥面、人工岛等结构作用复杂且较强。通过三维物理模型试验对岛桥结合部结构的波浪力进行试验研究。结果表明:1)设计水位和波浪条件下,岛桥结合部单跨箱梁结构的无量纲波浪水平力最大为0.7F/(ρgAH),无量纲波浪上托力最大为0.2F/(ρgAH)。2)在S(正向0°)和SSW(22.5°)方向波浪作用下,波浪力大于其他方向的结果。3)随着水位抬高、超高变小,岛桥结合部桥面箱梁结构受到的波浪上托力和水平力均变大。4)无量纲上托压强最大为2.0p/(ρgH),无量纲水平压强最大为1.9p/(ρgH)。

The elevation of the bridge deck at the island-bridge joint of the Hong Kong-Zhuhai-Macao Bridge is relatively low, thus the wave has a complex and strong effect on the bridge deck, artificial island and other structures at the joint of the island bridge under the design water level and wave conditions. The wave force of the island-bridge joint structure is experimentally studied through the 3 D physical model tests. The results show that: 1)Under the design water level and wave conditions, for the island-bridge junction, the maximum dimensionless wave horizontal force of the single-span box girder structure is 0.7 F/(ρgAH)and the maximum dimensionless wave uplift force is 0.2 F/(ρgAH). 2)The wave force is larger under the action of the S(positive 0°)and SSW(22.5°)direction waves than results in other directions. 3)As the water level rises and the relative elevation becomes smaller, the wave uplift force and the horizontal force on the structure both increase. 4)The maximum dimensionless uplift wave pressure is 2.0p/(ρgH)and the maximum dimensionless horizontal pressure is 1.9p/(ρgH).