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质量偏心和刚度偏心是结构偏心的两种重要形式,该文从单层平台结构体系在地震与波浪环境荷载作用下的一般振动方程出发,推导得到了可以考虑平台不同偏心形式的振动方程。在此基础上,针对不同水深的导管架海洋平台典型算例进行了数值计算,分析了三种荷载工况(地震作用、波浪作用、地震波浪耦合作用)时,平台结构的偏心形式、偏心率以及目标分析点的位置对偏心平台扭转耦联响应的影响规律,同时还分析了地震、波浪荷载强度对偏心平台扭转耦联响应的影响规律。分析结果表明:平台结构的偏心形式、目标点位置以及偏心率的大小都会影响偏心平台的扭转耦联响应,同时地震与波浪的联合作用对不同场地上不同周期类型的平台影响不尽相同,在某些情况下有必要考虑地震与波浪的联合作用对海洋平台进行抗震分析。
Eccentricity and eccentricity of stiffness are two important forms of structural eccentricity. Based on the general vibration equation of single-deck platform system under earthquake and wave environmental loading, the vibration equation which can consider different eccentric forms of the platform is deduced. On this basis, numerical examples are given for typical examples of jacket platform with different water depths. The eccentric forms of platform structure and eccentricity are analyzed under three load conditions (seismic action, wave action and seismic wave coupling) And the influence of the location of the target analysis point on the torsional coupling response of the eccentric platform are also analyzed. At the same time, the influence laws of the earthquake and wave load intensity on the torsional coupling response of the eccentric platform are also analyzed. The analysis results show that the eccentric form of the platform structure, the position of the target point and the eccentricity all affect the torsional coupling response of the eccentric platform. The combined effect of the earthquake and the wave has different influences on the platforms with different periods on different sites. In some cases, it is necessary to consider the seismic effect of seismic and wave on the offshore platform.