ABSTRACT Due to the influence of island type, there are serious wave energy concentration and overtopping. In order to understand influence of wave forces on bridges in island-bridge junctions on structural safety under extreme conditions such as hurricane waves and astronomical tides, selecting the most unfavorable SW and SE waves direction on the bridge and carried out physical model test, and comparing results with canonical formula calculated and measured forces of the completed HongKong-Zhuhai-Macau Bridge. Finally, test purpose was achieved by optimizing elevation. This test also verified the necessity of physical model test in force measurement and optimization design.
INTRODUCTION The Shenzhen-Zhongshan channel in this study is a "four in one" cluster project integrating ultra wide and ultra long subsea tunnel, ultra large and cross Sea Bridge, deep-water artificial island and underwater interchange. It has unprecedented scale, extremely complicate construction conditions and new comprehensive technical difficulties. It is another world-class major cross sea traffic project after Hongkong- Zhuhai-Macau Bridge in China. See Fig.1 is the project location and Fig.2 for layout of west artificial island. In the root area of the bridge at the junction of the island and the bridge on the west side of the island, through the preliminary physical model test, it is found that there are complex wave states such as wave energy concentration, vortex flow and so on in this area under the influence of the island type, and the wave overtopping on the top of the crest is the most serious. In addition, limited by the land elevation of the west artificial island, the bottom elevation of the bridge at the junction of the island and the bridge is the lowest, which is easy to be affected by the wave current coupling jacking force and lateral force, thus posing a serious threat to the safety of the bridge structure, and even the risk of damage. For the complex wave conditions, there are some difficulties in the selection of bridge design safety parameters. If the calculation is based on the similar standard formula, the results are often deviated greatly, and even there are some cases where the formula limit conditions are not applicable.