Abstract: According to the construction platform of Qingdao Gulf Bridge,finite element programming was used in different frequencies.The calculated dynamic responses was considered to be the excitation from various directions in the action of irregular wave force.The influence of the excitation from various directions on the random dynamic response was analyzed.The results show that the main mode shape of twist is played when excited from 45° direction.Dynamic response experiences two peaks.The calculation results of static and dynamic were compared.The results show that the dynamic influence of the wave force should be considered during designing construction platform.

Key words: construction platform, wave force, excitation, various angles, power spectral density

摘要： 以青岛海湾大桥海上施工平台为背景,采用有限元分析程序提取了平台的各阶自振频率。对随机波浪作用下考虑不同激励方向的动力响应进行计算,并分析了不同激励方向对结构随机响应的影响,得出波浪荷载以45°方向激励时,结构以扭转为主的振型得到发挥,动力响应出现两次峰值。通过施工平台静、动力计算结果的比较,建议在施工平台的设计时,应充分考虑到波浪力的动力效应。

关键词: 施工平台, 波浪力, 激励, 不同角度, 功率谱密度