导管架海洋平台结构冰致强迫振动分析

Analysis of ice-induced forced vibration for offshore jacket platform structure

为了检验冰荷载振动理论的合理性并推动其在实际工程中的应用.首先介绍了动冰力的统一模型.然后利用动冰力函数的傅立叶级数展开,推导了在弯曲和屈曲冰力作用下,多自由度海洋平台结构反应的计算解析表达式;采用随机振动分析方法,对挤压随机动冰力作用的海洋平台结构进行了随机振动分析.最后,将方法应用于渤海某导管架结构简化模型冰振反应的分析,结果表明计算结果与实测结果具有很好的相一致性,验证了分析方法和统一动冰力模型可以较好地模拟实际的动冰力特性.

In order to verify the rationality of ice load vibration theory and promote its application to practical engineering, a unified dynamic ice load model is introduced firstly. Taking advantage of Fourier series expansion of the function of dynamic ice load, solutions for calculating the responses of multi - degree offshore platform structure under bending and buckling ice load are obtained. The random response of structure under crushing ice loading is obtained by random vibration analysis. Then the dynamic ice load model and structural response analysis methods are applied to the analysis of a simplified model of an offshore platform structure. The analytical results are in good agreement with measured results, which proves that the unified dynamic ice load model and structural response analysis methods can be used to simulate the characteristic of dynamic ice load.