强震区外海人工岛护岸位移控制标准

Allowable displacement limit for revetment of offshore artificial island in strong earthquake area

针对强震区外海人工岛护岸抗震设计,当采用拟静力分析并以控制安全系数的方法时,其结构不经济,可采用位移分析方法,而控制的位移量对于工程造价敏感,因此如何选取适当的位移控制标准至关重要,但现有规范无明确的规定可供参考。为此,对比国际主流规范体系ISO、PIANC、OCDI、FEMA、阿拉斯加岩土委员会等有关抗震设计位移的控制标准,结合马尼拉滨海新城项目的设计条件,提出适合该项目的位移控制标准,并基于SLIDE软件对不同峰值加速度、不同临界加速度下的位移进行敏感性分析。研究成果可为类似强震区外海人工岛护岸位移控制提供参考。

For the seismic design of revetment of the offshore artificial island in strong earthquake areas,when the method of quasi-static analysis and safety factor control is applied,the structure would be uneconomical,while the displacement analysis method can be used.The allowable displacement limit is sensitive to the engineering cost,so an appropriate allowable displacement limit is crucial for design;however,there are no clear provisions in the existing standards or manuals for reference.So,we compare the international standards or manuals such as ISO,PIANC,OCDI,FEMA,Alaska Geotechnical Commission and other related manuals on allowable displacement limit for the seismic design,and propose the displacement control limit suitable for Manila Waterfront City Reclamation Project based on actual design conditions of the project.Furthermore,we analyze the displacement sensitivity under different peak accelerations and different critical accelerations based on software SLIDE.The research results may serve as reference for the allowable displacement limit of similar offshore artificial islands in strong earthquake areas.